CN101282247A - Method for measuring network application performance supporting internet high bandwidth real time video application - Google Patents
Method for measuring network application performance supporting internet high bandwidth real time video application Download PDFInfo
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Abstract
A network application performance measuring method which supports the application of high bandwidth real-time video of internet belongs to the technical field of bidirectional transmission performance measurement of IPv4/IPv6 internet. The invention is characterized in that a random data flow which simulates the virtual real-time video or virtual real-time video data flow is adopted as a ''probe'', a network which combines a user application system with a measuring server and is based on an active mode and a reflection mode and an application performance measuring method thereof, a network which combines the client system with the measuring server and is based on the reflection mode and the application performance measuring method thereof, and the invention has the functions of subscriber identification and DOS attack prevention. The invention effectively realizes the intercommunication of the network measuring method which supports the application of high bandwidth real-time video and the application system. The description languages of the video application subscriber, the application system engineer and the network engineer to the network problem are unified. A real-time automatic and independent measuring environment is established. The criterion is provided for quickly finding out the bandwidth bottleneck of network transmission for diagnosing the failure and settling the problem.
Description
Technical field
Support the network application performance measurement method that internet high bandwidth real time video is used, belong to IPv4/IPv6 network fault diagnosis and performance test methods technical field.
Background technology
In recent years, along with the development of Next Generation Internet technology, the whole world has begun to take shape the network infrastructure platform that interconnects based on the IPv4/IPv6 agreement, and revolutionary application is in the ascendant.Wherein, the video transmission of high bandwidth and hard real-time is used, and is important component part wherein.(shared bandwidth was greater than 20Mbps when the shared bandwidth of every road video flowing＜1Mbps) compare, this class Video Applications required the video flowing transmission of every road with the Video Applications that has common h.323 agreement now.Practice for many years shows: existing the Internet seems unable to do what one wishes to the support of this class high-performance Video Applications.If do not do effective measurement in early stage and a large amount of application testings, and take the end-to-end quality of service safeguard measure, most this type of application can not success.
Up to the present, also be not exclusively used in method of measurement and the instrument of supporting that failure diagnosis and performance adjustment are carried out in the high bandwidth real time video application on this class the Internet.In existing network measure method and the instrument, as Iperf, the measurement problem of network performance in the time of can partly solving towards performance application.But, use this method and instrument, have following problem: 1) configurable parameter is a lot, uses complicated; 2) measure " probe " data flow feature and certain application-specific data stream format and have nothing to do, measurement result is not pointed; 3) can not realize the measurement etc. of intercommunication with true application system.The present invention attempts to overcome the above problems on the basis of finding out the key parameter of supporting the high-performance real-time video to use method of measurement comprehensively.Essential characteristic of the present invention comprises: 1) can simulate and produce the random data stream identical with real video flow data transmission feature as measuring " probe "; 2) set up unified descriptive language for Video Applications user, application system engineer and network engineers to network performance parameter; 3) be that user and network engineers set up full-time automatically autonomous measurement environment etc.
Summary of the invention
The object of the present invention is to provide a kind of network fault diagnosis and performance test methods of supporting that the high bandwidth real time video of every road video flowing more than 20Mbps used on the Internet.Its thinking of dealing with problems is:
(1) the true video flow data of simulation
The success or not of high-performance Video Applications during network implementation, greatly depend on end-to-end between the assurance of the network bandwidth.So, accurate Measurement Network transmission performance, it is very important to influence network bandwidth parameter as packet loss, time-delay etc.Simultaneously, because network performance is because of different during loading different pieces of information flow transmission it on, so the true application data of loading simulation flows on the network, will be more accurate to the measurement of its performance.Based on above thinking, the design of configurable client probe is identical random data of video stream data transmission feature and true application video flows data when having with actual implementation in the method for the present invention.The result who uses such " probe " to measure, especially at the high-performance Video Applications, it is very accurate to obtain measurement result.Only at the measurement of high-performance Video Applications, initiation parameter is pointed, uses simple and convenient simultaneously.
(2) unify Video Applications user, system engineer and network engineers descriptive language to network performance parameter
The enforcement of internet high-performance Video Applications is application layer protocol, network layer protocol and the cooperative processes of multi-layer protocol such as " interpersonal agreements ", and any one link goes wrong, and all will cause the failure of using.Because the difference of technology specialty, final user application, application system engineer and network manager adopt the different survey tool of being familiar with separately usually, obtain different measurement reports.Because different measurement reports adopts different technical languages, bring difficulty for each other communication and understanding, cause and can not deal with problems fast.So, at first need to design method and system of overlapping while user oriented and systems network administration personnel's network performance measurement, be to set up " common language ", the measurement result that acquisition can be understood jointly between user application, system engineer and the network manager.Based on above thinking, at client dissimilar " probe ", characteristics such as the packet loss of server end statistical computation analog data flow, time-delay, and analog image and real video stream file or real time video data stream play or loopback, make user and the network manager can be when really not setting up video equipment, the data report of measurement result can be obtained, the subjective vision/hearing evaluation of measurement result can be obtained again.
(3) set up autonomous measurement environment
When the cross-domain cooperation of carrying out the high-performance Video Applications or service, the difference of natural language, the continuous operation and the multiple spot that get jet lag are accompanied non-technical problems such as survey, have increased application system and have connected the difficulty of transferring.If each user can both test with certain " opposite end " (server) automatically arbitrarily when an opportunity arises, a lot of problems and fault just can solve in advance, the difficulty when having alleviated formal the debugging.In order to realize this target, we adopt client terminal/server structure, based on the method for initiatively measuring, through the user application of authentication can be at any time with end-to-end dedicated transmission path on the way each server carry out network and application performance measurement towards application-specific, server returns measurement result to same client, progressively finds the node that bandwidth bottleneck takes place.Simultaneously, when Network Packet Loss arrived some numerical value, " probe " analogue data amount was transmitted current limliting.Prevent to utilize measurement " probe " high amount of traffic amount to carry out malicious attack.Like this, do not need manual intervention, do not need the affiliate, each node in time solves the problem of own node, has saved the co-ordination amount greatly, has also prevented distributed denial of service attack (DDOS).
(4) select the DVTS system as an example
High-performance Video transmission system-digital video transmission system (DVTS) that we select generally to use in the world at present is as the example of studying.No matter still all representative at aspects such as network supports in application system itself the DVTS system is.DVTS is the digital video transmission system of Japanese wide project exploitation, considers its image resolution ratio 720*480pixel, clear video transmission quality up to standard from the characteristic of application system itself; Propagation delay time＜150ms supports real-time, interactive substantially; Windows and linux version are arranged, user interface close friend; Support point-and point-multicast communication; The hardware configuration ratio of performance to price is good, and system is stable; Can obtain free sources code etc.Consider that from the characteristic of network support application transport it supports the IPv4/IPv6 agreement simultaneously; Support clean culture and multicast network; Every road video transmission bandwidth reaches 30Mbps.So,, the reference of research is provided for surely other similar performance application with regard to one if can solve DVTS application system transmission problem on the internet.
Support network and application performance method of measurement that internet high bandwidth real time video is used, it is characterized in that the following steps of finishing successively:
Step 1: initialization
User A and user B are respectively at main frame MC separately
A, MC
BThe last installation digital video transmission DVTS of system
A, DVTS
BAnd the measuring customer machine dvping of system; Install respectively in the subnet at place separately at user A, user B and to have the measurement server MS that DVTS measures server system Dvmcast system
A, MS
BContinuing to use family A to user B, perhaps in user B each autonomous territory AS to the bidirectional transmission path of user A at least one above-mentioned measurement server is being installed respectively;
This measurement measuring process comprises two kinds of two kinds of mode of operations: aggressive mode and reflective-mode;
Aggressive mode: be configured to down parameter in the server end order line: the agreement of IPv4 version or IPv6 version, nothing circulation/loop play, appointment DVTS video file name, the destination address that is dealt into and destination port number (clean culture)/multicast group address and port numbers (multicast), so that this measurement server reads the DVTS video file of storage, and be dealt into the location, designated destination in the video flowing mode of DVTS, receive and show the audio and video stream of corresponding D VTS application program for authenticated user entities; Be configured to down parameter during Client command is capable: measure server address and port numbers;
Reflective-mode: be configured to down parameter in the server end order line: IPv4 version or IPv6 version, receive the group address of Any-Source Multicast ASM, receive specific source multicasting SSM source address and group address (multicast), receiving port number and destination port number (clean culture) are so that described measurement server sends main frame to the real-time DVTS video flowing reflected back of receiving; Described measuring customer machine produces and the real identical random data stream of DVTS video flowing transmission feature in order to simulation, so that combine with described measurement server, unidirectional and bilateral network performance when measuring the carrying bandwidth applications, described random data stream has adopted the data flow that has with the 5+ tuple identical traffic feature of DVTS to be used as " probe " that user side is initiatively measured, this random data stream has following message format: the IP head, the IP address and this machine address that comprise the opposite end, the UDP head, comprise the Peer-Port of appointment and the port that this machine is specified or selected at random, the RTP head, comprise that the time cuts, be used to calculate packet loss, time-delay and transmission rate, DV-DIF piece, data wherein produce at random, and the quantity of piece depends on agreed transmission rate; Be configured to down parameter during Client command is capable: server address and port numbers;
Continue to use family A to B or continue to use and disposed at least one respectively in the M of family B to the A data transfer path the autonomous territory and measure server MS
j, j=1,2,3 ... M; , consider the server in A, the B place subnet, along A to B direction, be respectively: MS
A, MS
1... MS
M-1, MS
MMS
B
Step 2: user A is the measurement server MS in the subnet of user B place according to the following steps
BThe network bi-directional transmission performance of carrying out from user A to user B is measured;
Step 2.1. user A is by measuring main frame MC
ATo measuring server MS
BCGI(Common gateway interface) CGI send request and carry out the order of diverse network performance measurement, after CGI receives, start authentication module, user identity is authenticated;
After step 2.2 user A authentication is passed through, measure server MS by landing
BThe webpage active measurement pattern of selecting this server to combine with application system, MS
BRead the DVTS video file of storage, the DVTS video file is sent to user A;
Step 2.3 user A is at MC
ALast startup DVTS standard receives program, receives and demonstration DVTS video data stream, measures server MS
BThe monitor data curve of network transmission speed in the transmission period is sent to user A;
After step 2.4 user A authentication is passed through, measure server MS by landing
BThe webpage reflection measurement pattern of selecting this server to combine with client machine system;
Step 2.5 user A is at MC
ALast startup operation DVTS measuring customer end dvping disposes related parameter, to measuring server MS
BSend simulation real video random data stream;
Step 2.6 is measured server MS
BAfter receiving this random data stream, this data flow is sent it back user A;
Step 2.7 user A calculates two-way packet loss according to formula, and time-delay and transmission rate are presented at MC with computer result
AOn;
Step 2.8 user A measures server MS by landing
BThe webpage reflection measurement pattern of selecting server to combine with application system;
Step 2.9 user A sets up the DVTS system peripheral, the real video flow data of gathering is in real time mail to measure server MS
B, MS
BAfter receiving this real time video data stream this video flowing is sent it back user A;
Step 2.10 user A is at MC
ALast startup DVTS standard receives program, receives and demonstration DVTS live video stream;
User A finishes various method of measurement according to step 2, if any one measurement performance wherein meets the demands, the DVTS that just can successfully start between user A and the user B uses; If performance can not meet the demands, then carry out next step.
Step 3: user A carries out the pointwise failure diagnosis according to the following steps:
Step 3.1 user A is by measuring main frame MC
AWith remove MS
BThe measurement server MS of the outer M the most close user B
MCarry out the amphicheirality's energy measurement described in step 2,, measure server MS just failure judgement occurs in if performance meets the demands
NTo the network segment between the user B;
Step 3.2 is not if performance meets the demands, and the user adopts by method described in the step 2, checks by user A to measuring server MS
M-1This network segment transmitted in both directions performance, if performance meets the demands, then failure judgement occurs in to dispose and measures server MS
M-1Autonomous territory with autonomous territory that dispose to measure server MS and dispose MS
BBetween the subnet;
Step 3.3 is with step 3.1, and 3.2 analogize, up to finishing user A and MS
1And MS
AMeasure, find till the network segment of guilty culprit;
Step 3.4 and the network manager in the autonomous territory of the nearest guilty culprit of user A get in touch, and coordinate to solve the Network Transmission bottleneck problem;
Step 3.5 is from from the nearest fault point of user A, repeating step 3.1 to 3.4, and pointwise solves the fault point, solves until the all-network transmission bottleneck;
Step 4: the DVTS that successfully starts between user A and the user B uses;
In like manner, also can finish user B to the discovery of user A along faulty section on the data packet transmission path.
Description of drawings
Fig. 1 supports the high-performance real-time video to use the measurement server disposition and network connects topological schematic diagram;
The FB(flow block) of Fig. 2 described method of the present invention;
Fig. 3 measures server mode of operation: a: measure the aggressive mode that server combines with application system,
B: measure the reflective-mode that server combines with application system,
C: measure the reflective-mode that server combines with the measuring customer machine;
Fig. 4 a:DVTS real video data message form,
B: have random data stream message format with DVTS video flowing identical traffic feature;
Fig. 5 distributed measurement method work schematic diagram;
Fig. 6 experiment measuring environment measurement server disposition and network connection diagram;
The part explanation of nouns of using among Fig. 1 is as follows:.
● AS: autonomous territory number (Autonomouse System Number)
● MS: measure server (measurement server)
● MC: measuring customer end (measurement client)
● DVTS: digital video transmission system
Embodiment
The inventive method is by following three part organic compositions:
(1) method of measurement that combines with application system based on server;
(2) method of measurement that combines with client machine system based on server;
(3) distributed measurement method of servicing.
Support that server disposition is measured in the application of high-performance real-time video and network connects topological schematic diagram as shown in Figure 1.The user A that is positioned at autonomous territory X need carry out the high-performance real-time video with the user B that is positioned at autonomous territory Z and communicate by letter, and supposes that user A is identical to the transmission path of user A with user B to the transmission path of user B, and employed application system is DVTS.
The DVTS user application carries out before the high-performance video communication or uses when unsuccessful, uses the inventive method to carry out network and application performance is measured, and it is as follows to carry out the required step of finishing of failure diagnosis:
Step 1: initialization: user A and user B install the (DVTS of digital video transmission system on main frame
A, DVTS
B) and measuring customer machine (MC
A, MC
B) system (dvping), under user A, B, respectively install and measure server (MS in the subnet
A, MS
B) system (Dvmcast), continue to use family A to user B or user B to user A bidirectional transmission path on each autonomous territory (AS) in install and measure server (MS
1, MS
2, MS
3);
Step 2: user A uses measuring customer machine (MC
A) to the measurement server (MS in the user B subnet
B) initiate to connect, finish active measurement pattern that server combines with application system and the reflection measurement pattern that server combines with client machine system, server combines with application system, measure two-way performance, comprise time-delay, packet loss and transmission rate.As meet the demands, can carry out application communication;
Step 3: after step 2 execution, performance can not meet the demands, and then user A uses measuring customer machine (MC
A) to the measurement server (MS of autonomy field system (AS=Z)
3) initiate to connect, measure two-way performance, comprise time-delay, packet loss and transmission rate.As meet the demands, say something out the network segment to user B at autonomous territory Z.Get in touch with the network manager of the corresponding network segment, deal with problems; As not meeting the demands execution in step 4;
Step 4: repeating step 3, user A use measuring customer machine (MC
A) to the measurement server (MS of autonomy field system (AS=Y)
2) and the measurement server (MS of autonomy field system (AS=X)
1) initiate to connect, repeating step 2 is measured two-way performance, comprises time-delay, packet loss and transmission rate.As meet the demands, say something out the network segment to user B at autonomous territory Y.Get in touch with the network manager of the corresponding network segment, deal with problems; As not meeting the demands execution in step 5;
Step 5: copy step 3,4, finish the measurement server MS in user A and the autonomous territory AS=X
1And measurement server MS in the subnet of user place
AMeasurement, progressively find the bottleneck of transmission path, get in touch with the network manager of the corresponding network segment, deal with problems;
Step 6: along A to the B direction, the network manager in pointwise and each autonomous territory coordinates, and pointwise is dealt with problems;
If user A is identical to the transmission path of user A with user B to the transmission path of user B, so, after the bidirectional measurement to user B of being initiated by user A is finished (step 2-6), also just finished the measurement of the transmission of user A transmitting-receiving bidirectional Video Applications, also finished user B simultaneously and sent out the transmission measurement of receiving the two-way video application to user A; If user A is inequality to the transmission path of user A to transmission path and the user B of user B, execution in step 7;
Step 7: copy step 2-6, can finish user B, finish user B and send out the transmission measurement of receiving the two-way video application to user A to the discovery and the solution of user A along faulty section on the data packet transmission path.
The entire method FB(flow block) as shown in Figure 2.
In order to realize the network measure method and to use the method for measurement that the DVTS application system combines, unified Video Applications user, application system engineer and network engineers are to the descriptive language and the autonomous problem of measuring of network problem, we have developed measurement server (Dvmcast), it both can combine with the DVTS application program, unidirectional and the two-way performance of Measurement Network carrying high bandwidth Measurement Network, the subjective assessment of video/audio transmission performance is provided for the gauger, can combine with the client computer of the true DVTS video stream data of simulation again, the data report of video/audio transmission performance is provided for the gauger.
The measurement server (dvmcast) of exploitation has two kinds of mode of operations, shown in Fig. 3 .a and Fig. 3 .b.
(1) aggressive mode: according to setting, the DVTS file that server can be read to store in the file, and be dealt into the location, designated destination with the form of DVTS, the DVTS application program that destination host starts standard can receive and show corresponding video and audio frequency.Configurable parameter is under this pattern:
●-4|6 Internet protocol (edition 4 or version 6)
●-noloop does not have loop play
●-dvffv_file specifies the DVTS file
● destination address and target port that-d dst_addr dst_port sends to
Simultaneously, the user can obtain to transmit the monitor data curve chart of network transmission speed (shared bandwidth) in the DVTS video file time period.Transverse axis is represented the Measuring Time section, and the longitudinal axis is represented transmission rate value.
(2) reflective-mode: server can send main frame to the real-time DVTS that receives (or other UDP messages) video flowing reflected back.Under this pattern, configurable parameter is:
●-4|6 Internet protocol (edition 4 or version 6)
●-asm grp receives Any-Source Multicast (ASM) group address
●-ssm src grp receives specific source multicasting (SSM) source address and group address
●-rp rcv_port receiving port (being defaulted as 8000)
●-ech ech_port target port (being defaulted as 8000)
More than two kinds of patterns except that being used for server and application system combine, in order not set up under the situation of true DVTS peripheral hardware, Measurement Network performance easily, unified Video Applications user and network engineers are to the language and the autonomous problem of measuring of network description problem, we have developed measuring customer machine system (dvping), it can be simulated and produce and the real identical random data stream of DVTS video flowing transmission feature, combine with measurement server (Dvmcast), work in reflective-mode, the two-way performance of Measurement Network.With the command line mode is the data report that the gauger provides network performance measurement.
The basic principle of simulation random data stream is as follows: when each data flow is transmitted on the Internet, all carry fixing 5+ tuple transmission feature, they are: source IP address, target ip address, source transmit port, object transmission port, host-host protocol, the message transmission form.The random data stream of analog D VTS transmission feature is exactly to adopt " probe " initiatively measured as client with the data flow of the 5+ tuple identical traffic feature of DVTS.DVTS real video stream packet form is shown in Fig. 4 .a, and the message format of simulation random data stream is shown in Fig. 4 .b.Wherein: the IP head comprises IP address and this machine address of opposite end; The UDP head comprises the Peer-Port (DVTS:8000) of appointment and the port that local terminal is specified or selected at random; The RTP head comprises timestamp, is used for calculating packet loss, time-delay and transmission rate; Data in the DV DIF piece can produce at random, and the quantity of piece is according to the speed decision that will transmit.
The reflective mode operation of measuring server and measuring customer machine is shown in Fig. 3 .c, and configurable parameter is:
●-p snd_port transmit port (being defaulted as 8000)
●-rp rcv_port receiving port (being defaulted as 8000)
●-t period test period (second)
●-bw bandwidth test rate (bps/kbps/Mbps)
● host destination address (or domain name)
●-4|6 Internet protocol (edition 4 or version 6)
●-asm grp receives Any-Source Multicast (ASM) group address
●-ssm src grp receives specific source multicasting (SSM) source address and group address
Wherein the test rate of Fa Songing, doubled to 2Mbps every 10 seconds from 1Mbps, 4Mbps, and 8Mbps, 16Mbps is until the 32Mbps that reaches the DVTS maximum transmission bandwidth.
The network performance of measuring the measurement of server and measuring customer machine co-operation comprises: two-way packet loss, time-delay and transmission rate.We are according to following formula computing network performance parameter.
Packet loss:
Wherein: max_seq and min_seq are respectively the maximum in the window, parcel sequence number, and lost_packets is the bag sequence number number of disappearance in the window.
Two-way time-delay:
RTT＝RTT×w+(rt-st)×(1-w) (2)
Wherein rt is a time of reception; St is a transmitting time; W is an attenuation coefficient, and between 0～1, it makes the result can represent interior mean state of a period of time.
Transmission rate:
Wherein: max_seq and min_seq are respectively the maximum in the window, parcel sequence number, and Bi is a byte number of receiving bag.In order to prevent that so big flow measurement " probe " data are used to carry out network congestion and attack, when using this method, when network performance relatively poor (when packet loss reaches certain numerical value), client computer " probe " sends current limliting, use current transmission rate to carry out one-shot measurement, transmission rate no longer increases.
In order to solve along the problem of transmission path areal survey, we utilize universal network interface inputting interface (CGI) packing of webpage (WEB) service to measure server and measuring customer machine, as shown in Figure 4, to solve far-end server control, functions such as security control and server traffic inspection.Specifically comprise:
(1) user sends the signaling that request server sends the DVTS video file by the mode of landing web browser to universal network interface CGI, CGI will carry out authentication to the application user, check that whether register the address of user's request, as registered, then carries out in database.
(2) user asks to use the testing server on client/server mechanism and the Network Transmission path to carry out performance measurement, and CGI will check that whether register the address of user's request, as registered, then carries out in database.
Owing to adopted web interface, therefore under the cooperation of domain name system, can find required testing server and test client computer easily.Authenticated user can with measure servers along on the data transfer path all and carry out above diverse network performance measurement one by one, and obtain measurement result.
The experiment test environment of the method for the invention as shown in Figure 5.
Test environment is built on real the Internet backbone network, contains Eurasian net, and education network and campus network are respectively autonomy field system AS24489 and AS4538.Measure server two of AS24489 deploy, lay respectively at Beijing node (202.179.242.102) and Hong Kong node (202.179.244.105).At testing server of AS4538 deploy, be positioned at Beijing node (202.112.35.31).User C wish and user B between start DVTS and use.At first, (dvping operates in MC in user C use measuring customer machine system
1On) carrying out applied in network performance test to measuring server 202.179.242.102, the result is as shown in table 1, and when transmission rate reaches 6Mbps when above, packet loss appears in network.Require the requirement of 30Mbps bandwidth for transmission too wide in the gap with the DVTS live video stream, can't normally start the DVTS Video Applications.Simultaneously, measure " probe " automatic current limiting transmission 6Mbps, only carry out one-shot measurement, can big impact not arranged network.At this moment, the user need carry out further sectionalization test, solves network problem under network manager's help.
Measurement data when table 1 network performance is not good
In like manner, if user A wishes and user B between start DVTS and use.At first, (dvping operates in MC in user A use measuring customer machine system
2) carrying out the testing characteristics of network test with measurement server 202.179.244.105, the result is as shown in table 2.As seen from the figure, measurement result does not have the packet loss phenomenon, and network link satisfies the DVTS application requirements from the performance of user A-campus network-education network trunk-net Beijing, Eurasia node-net Hong Kong, Eurasia node-user B, can carry out DVTS and use two-way video communication.
imini2-nms％?dvping?202.179.242.102
ping?202.179.242.102?with?dvts?data：
send?port：8000
recv?port：8000
period ：10s
snd_pkt rcv_pkt snd_rate rcv_rate loss rtt
913 913 1Mbps 1Mbps 0％ 3.091ms
1824 1824 2Mbps 2Mbps 0％ 3.14ms
3646 3646 4Mbps 4Mbps 0％ 3.13ms
7290 7290 8Mbps 8Mbps 0％ 3.258ms
14577 14577 16Mbps 16Mbps 0％ 3.426ms
29152 29152 32Mbps 32Mbps 0％ 3.895ms
imini2-nms％
Measurement data when table 2 network performance is fine
User A uses the DVTS system to test measuring server 202.179.244.105, receives that DVTS video file that server sends as shown in Figure 7.(computer screen shot) image quality is good, illustrates that the one-way video communication from 202.179.244.105 to user A is normal.
Network transmission speed monitor data curve chart as shown in Figure 8 in the transmission DVTS document time.Transverse axis is represented the Measuring Time section, and the longitudinal axis is represented transmission rate value.
The experiment test result has reached the measurement requirement of the present invention's expection.Video data stream is as measuring " probe " when the random data stream of the true real-time video of employing simulation and actual implementation, utilization is based on the server and the application system method of measurement of aggressive mode and reflective-mode, method of measurement based on the server and the client machine system of reflective-mode, network measure method and the intercommunication of using the DVTS system have been realized effectively, unified the Video Applications user, application system engineer and network engineers are to the descriptive language of network problem, set up full-time automatically, the autonomous environmental problem of measuring is for the gauger provides based on the data report of order line and based on the subjective assessment of video/audio.The use of distributed measurement method can be carried out areal survey, finds the bottleneck of Network Transmission apace, can support the internet high-performance Video Applications that the adjustment foundation is provided for making network.
Claims (1)
1, support the network application performance measurement method that internet high bandwidth real time video is used, it is characterized in that the following steps of finishing successively:
Step 1: initialization
User A and user B are respectively at main frame MC separately
A, MC
BThe last installation digital video transmission DVTS of system
A, DVTS
BAnd the measuring customer machine dvping of system; Install respectively in the subnet at place separately at user A, user B and to have the measurement server MS that DVTS measures server system Dvmcast system
A, MS
BContinuing to use family A to user B, perhaps in user B each autonomous territory AS to the bidirectional transmission path of user A at least one above-mentioned measurement server is being installed respectively;
This measurement measuring process comprises two kinds of two kinds of mode of operations: aggressive mode and reflective-mode;
Aggressive mode: be configured to down parameter in the server end order line: the agreement of IPv4 version or IPv6 version, nothing circulation/loop play, appointment DVTS video file name, the destination address that is dealt into and destination port number (clean culture)/multicast group address and port numbers (multicast), so that this measurement server reads the DVTS video file of storage, and be dealt into the location, designated destination in the video flowing mode of DVTS, receive and show the audio and video stream of corresponding D VTS application program for authenticated user entities; Be configured to down parameter during Client command is capable: measure server address and port numbers;
Reflective-mode: be configured to down parameter in the server end order line: IPv4 version or IPv6 version, receive the group address of Any-Source Multicast ASM, receive specific source multicasting SSM source address and group address (multicast), receiving port number and destination port number (clean culture) are so that described measurement server sends main frame to the real-time DVTS video flowing reflected back of receiving; Described measuring customer machine produces and the real identical random data stream of DVTS video flowing transmission feature in order to simulation, so that combine with described measurement server, unidirectional and bilateral network performance when measuring the carrying bandwidth applications, described random data stream has adopted the data flow that has with the 5+ tuple identical traffic feature of DVTS to be used as " probe " that user side is initiatively measured, this random data stream has following message format: the IP head, the IP address and this machine address that comprise the opposite end, the UDP head, comprise the Peer-Port of appointment and the port that this machine is specified or selected at random, the RTP head, comprise that the time cuts, be used to calculate packet loss, time-delay and transmission rate, DV-DIF piece, data wherein produce at random, and the quantity of piece depends on agreed transmission rate; Be configured to down parameter during Client command is capable: server address and port numbers;
Continue to use family A to B or continue to use and disposed at least one respectively in the M of family B to the A data transfer path the autonomous territory and measure server MS
j, j=1,2,3 ... M; , consider the server in A, the B place subnet, along A to B direction, be respectively: MS
A, MS
1... MS
M-1, MS
MMS
B
Step 2: user A is the measurement server MS in the subnet of user B place according to the following steps
BThe network bi-directional transmission performance of carrying out from user A to user B is measured;
Step 2.1. user A is by measuring main frame MC
ATo measuring server MS
BCGI(Common gateway interface) CGI send request and carry out the order of diverse network performance measurement, after CGI receives, start authentication module, user identity is authenticated;
After step 2.2 user A authentication is passed through, measure server MS by landing
BThe webpage active measurement pattern of selecting this server to combine with application system, MS
BRead the DVTS video file of storage, the DVTS video file is sent to user A;
Step 2.3 user A is at MC
ALast startup DVTS standard receives program, receives and demonstration DVTS video data stream, measures server MS
BThe monitor data curve of network transmission speed in the transmission period is sent to user A;
After step 2.4 user A authentication is passed through, measure server MS by landing
BThe webpage reflection measurement pattern of selecting this server to combine with client machine system;
Step 2.5 user A is at MC
ALast startup operation DVTS measuring customer end dvping disposes related parameter, to measuring server MS
BSend simulation real video random data stream;
Step 2.6 is measured server MS
BAfter receiving this random data stream, this data flow is sent it back user A;
Step 2.7 user A calculates two-way packet loss according to formula, and time-delay and transmission rate are presented at MC with computer result
AOn;
Step 2.8 user A measures server MS by landing
BThe webpage reflection measurement pattern of selecting server to combine with application system;
Step 2.9 user A sets up the DVTS system peripheral, the real video flow data of gathering is in real time mail to measure server MS
B, MS
BAfter receiving this real time video data stream this video flowing is sent it back user A;
Step 2.10 user A is at MC
ALast startup DVTS standard receives program, receives and demonstration DVTS live video stream;
User A finishes various method of measurement according to step 2, if any one measurement performance wherein meets the demands, the DVTS that just can successfully start between user A and the user B uses; If performance can not meet the demands, then carry out next step;
Step 3: user A carries out the pointwise failure diagnosis according to the following steps:
Step 3.1 user A is by measuring main frame MC
AWith remove MS
BThe measurement server MS of the outer M the most close user B
MCarry out the amphicheirality's energy measurement described in step 2,, measure server MS just failure judgement occurs in if performance meets the demands
NTo the network segment between the user B;
Step 3.2 is not if performance meets the demands, and the user adopts by method described in the step 2, checks by user A to measuring server MS
M-1This network segment transmitted in both directions performance, if performance meets the demands, then failure judgement occurs in to dispose and measures server MS
M-1Autonomous territory with autonomous territory that dispose to measure server MS and dispose MS
BBetween the subnet;
Step 3.3 is with step 3.1, and 3.2 analogize, up to finishing user A and MS
1And MS
AMeasure, find till the network segment of guilty culprit;
Step 3.4 and the network manager in the autonomous territory of the nearest guilty culprit of user A get in touch, and coordinate to solve the Network Transmission bottleneck problem;
Step 3.5 is from from the nearest fault point of user A, and to B, pointwise and each autonomous territory network manager coordinate, and solve the fault point, solve until the all-network transmission bottleneck by A;
If user A is identical to the transmission path of user A with user B to the transmission path of user B, so, after the bidirectional measurement to user B of being initiated by user A is finished (step 2-3), also just finished the measurement of the transmission of user A transmitting-receiving bidirectional Video Applications, also finished user B simultaneously and sent out the transmission measurement of receiving the two-way video application to user A;
Step 4: the DVTS that successfully starts between user A and the user B uses;
If user A is inequality to the transmission path of user A to transmission path and the user B of user B, execution in step
Step 5: in like manner, copy step 2-4, can finish user B, send out the transmission measurement of receiving the two-way video application to user A thereby finish user B to the discovery and the solution of user A along faulty section on the data packet transmission path.
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| CN2008100942661A CN101282247B (en) | 2007-04-27 | 2008-04-25 | Method for measuring network application performance supporting internet high bandwidth real time video application |
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