CN106059951A - Transmission control method for DCN (Data Center Network) based on multilevel congestion feedback - Google Patents
Transmission control method for DCN (Data Center Network) based on multilevel congestion feedback Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
- H04L47/263—Rate modification at the source after receiving feedback
Abstract
The invention discloses a transmission control method for a DCN (Data Center Network) based on multilevel congestion feedback. The method comprises the steps of setting a switch cache queue length threshold which comprises a first-level queue marking threshold 1 and a second-level queue marking threshold 2; monitoring a current queue length by each switch in a transmission path when multiple sending parties send data concurrently; comparing the current queue length with the first-level queue marking threshold 1 and the second-level queue marking threshold 2, and feeding back a current network congestion state; reducing a window increasing speed in a slow start stage according to first-level congestion feedback; and timely logging out the slow start stage, and entering a congestion avoiding stage according to the second-level congestion feedback. According to the method, the throughput breakdown phenomenon resulting from the fact that the window increasing speed is too fast in the slow start stage when DCN concurrent transmission is carried out can be effectively avoided. The network throughput is greatly improved, and the integrated performance of a network application is improved.
Description
Technical field
The present invention designs one in DCN (data center network, Data CenterNetwork) based on multilevel congestion
The transfer control method of feedback.
Background technology
In recent years, along with developing rapidly and universal of the network applications such as on-line search, social networks, ecommerce, more come
The most application on site systems are migrated in data center, utilize large-scale calculating and storage resource to provide the user respectively
Plant network service.In face of huge user's visit capacity, as calculating and the storage core of Next Generation Internet, data center
Bearing capacity and service performance receive stern challenge.
Owing to data center network has ultra high bandwidth, the characteristic of ultralow time delay, this has the biggest with traditional wide area network
Difference, so the application poor effect that traditional TCP is in data center network.In data center network high concurrent same
Step concurrently flows and easily causes that some path is instantaneous becomes bottleneck, causes network congestion, data packetloss occurs and ultimately result in TCP flow
Time-out.And transmission stream major part is the low-volume traffic stream (90% is less than 100KB) of latency sensitive in data center network, and these
Stream is likely to just complete transmission at slow start stage.The time-out that the transmission window of TCP flow slow start stage quickly increases and causes
Hangover, (90% is less than the time-out time (the minimum 200ms of acquiescence) of conventional TCP protocols with data center network round trip transmission delay
1ms) etc. do not mate factor, cause that throughput collapse phenomenon occurs, TCP Incast phenomenon occurs, greatly reduce in data
The communication capacity of heart network.
Along with internet, applications becomes high diversity and complication, in order to solve the deficiency of Traditional control host-host protocol,
Alleviating the TCP Incast phenomenon in data center network, the most many scholars are improving TCP to network data congestion control
Discovery and control ability aspect done substantial amounts of improvement Journal of Sex Research, seek the net that some stable methods allow Number dynamics change
The shared limited network bandwidth resources that network user energy is fair.
ICTCP (Incast Congestion Control TCP) is primarily upon avoiding the high link throughput concurrently caused
The produced packet drop of rate collapse, ICTCP only revises recipient.It is that interval is divided into the time by the time with 2RTT (two-way time)
Groove, carries out the assessment of available bandwidth at first RTT, calculates adjustment quota at second RTT according to available bandwidth assessment result
It is adjusted receiving window.But, the accuracy that RTT calculates directly affects the performance of ICTCP.
DCTCP (Data Center TCP) agreement is aiming at high bandwidth, the data center network of high fan-in application proposes
Replace conventional TCP protocols improvement host-host protocol.It utilizes ecn (explicit congestion notification) (Explicit Congestion
Notification, ECN) judge congestion state.DCTCP discusses afterbody the most comprehensively and postpones, and is being changed without low caching
On the premise of commercial switches, it is achieved the high burst tolerance of DCN (data center network), low latency, high-throughput.But,
DCTCP agreement is when concurrency is less, and switch caching still there will be part stream congestion packet loss and time-out occurs.And DCTCP
Stream is under minimum transmission window, it is easier to occur the packet loss of whole transmission window to cause RTO (Retransmission timeout time) time-out.
D2Transmission Control Protocol, on the basis of DCTCP, utilizes gamma correction function, improves the fall window mode of DCTCP,
And consider that the deferred constraint of every data stream requires reasonably to drop window during improving.D2TCP not only increases
The quantity of the data stream completed in deferred constraint, moreover it is possible to well coexist with conventional TCP, but due to the sensitive journey of deferred constraint
Degree deficiency, so performance also has the biggest room for promotion.
Therefore, in order to avoid in concurrent transmission slow start stage to increase window too fast and cause throughput crash issue, allow data
Central site network application can effectively utilize available bandwidth, becomes a problem demanding prompt solution.
Summary of the invention
The technical problem to be solved is to provide a kind of transmission control based on multilevel congestion feedback in DCN
Method, the method can effectively be alleviated data stream in data center network and occur that hangover is super owing to increasing window is too fast in slow turn-on
Time, thus avoid producing the phenomenon of throughput collapse, network throughput is substantially improved, promotes the overall performance of network application.
The technical solution of invention is as follows:
A kind of transfer control method based on multilevel congestion feedback in DCN,
Switch length of buffer queue threshold value is set: include first order queue labelling thresholding Threshold1 and second level team
Row labelling thresholding Threshold2；
Each switch monitoring current queue size when multiple senders send data concomitantly, on transmission path；Will
Current queue size compares with first order queue labelling thresholding Threshold1 and second level queue labelling thresholding Threshold2,
Feedback current network congestion state；
According to the comparative result of current queue size with first order queue labelling thresholding Threshold1, i.e. the first order is congested
Feedback alleviates the increasing window speed of slow turn-on；
According to the comparative result of current queue size with second level queue labelling thresholding Threshold2, i.e. the second level is congested
Feedback exits slow start stage in time and enters congestion avoidance phase.
Above-mentioned transfer control method based on multilevel congestion feedback in DCN, specifically includes following steps:
Step one: initialize: arrange that sender sends the initial value of window cwnd size, to arrange machine monitoring current queue long
Degree threshold value: include first order queue labelling thresholding Threshold1 and second level queue labelling thresholding Threshold2, number is set
According to bag first order congestion flag position ECT and the initial value of congestion flag position, second level CE, sender slow turn-on flag bit ST is set
Initial value be 0；
Step 2: each switch monitoring current queue size on transmission path, when current queue size exceedes the first order
During queue labelling thresholding Threshold1, immediately the first order congestion flag position ECT of the packet in current queue is set to 1；
When current queue size exceedes second level queue labelling thresholding Threshold2, then by second of the packet in current queue
Level congestion flag position CE is set to 1；After packet arrives recipient, recipient confirms that to packet wrapping ACK stamps correspondence
Congestion flag, and will confirm that bag ACK is sent to sender；
After sender receives the whole confirmation bag ACK in currently transmitted window, according to all confirming the first order in bag ACK
Congestion flag position ECT and congestion flag position, second level CE is set to the quantity of 1 and calculates the first order and second level Congestion Level SPCC α and β；
Step 3: sender is according to the flag bit that its slow turn-on flag bit ST[ST is transmitting terminal] judge whether to continue
It is in slow start stage, if ST is 0, then keeps slow start stage and go to step four, otherwise exiting slow start stage, enter
Enter congestion avoidance phase, and go to step six；
Step 4: judge that the first order congestion flag position ECT of all confirmation bag ACK in currently transmitted window is
0, if it is, transmission window cwnd is updated to 2 × cwnd, and proceed to step 8；Otherwise, five are gone to step；
Step 5: judge that congestion flag position, the second level CE of all confirmation bag ACK in currently transmitted window is
0, if it is, transmission window cwnd to be updated to cwnd+cwnd × (1 α)3, proceed to step 8；Otherwise, slow turn-on mark is put
Position ST is 1, proceeds to step 8；
Step 6: judge that congestion flag position, the second level CE of all confirmation bag ACK in currently transmitted window is
0, if it is, transmission window cwnd is updated to cwnd+1, proceed to step 8；Otherwise, step 7 is proceeded to；
Step 7: adjust according to network congestion degree and send window size, transmission window cwnd is updated to cwnd × (1
β/2), proceed to step 8；
Step 8: transmitting terminal sends data by the transmission window cwnd size after updating, and judges whether data have sent
Finish, without being sent, return step 2, otherwise terminate data transmission.
Above-mentioned transfer control method based on multilevel congestion feedback in DCN, described step one includes: will initially send
Window cwnd is dimensioned to 1, and first order queue labelling thresholding Threshold1 is set to 20, second level queue labelling thresholding
Threshold2 is set to 65, and first order congestion flag position ECT and congestion flag position, second level CE is both configured to 0；
Above-mentioned transfer control method based on multilevel congestion feedback in DCN, in described step 2: sender receives and works as
After whole confirmation bag ACK in front transmission window, according to all confirming first order congestion flag position ECT and second in bag ACK
Level congestion flag position CE is set to the quantity of 1 and calculates the first order and second level Congestion Level SPCC α and β, and computing formula is:
α=m/cwnd
β=n/cwnd
Wherein, m and n is all in being currently transmitted window respectively confirms first order congestion flag position ECT and second in bag ACK
The congested CE of level is set to the quantity of 1.
Beneficial effect:
The method have technical effect that: when multiple senders send data concomitantly, the buffer queue of switch is long
Thresholding Threshold1 and Threshold2 of degree successively twice process feeds back current network congestion state.Thresholding
Threshold1 is used for alleviating the quick growth sending window in slow start stage, prevents TCP flow time-out, it is thus possible to gentle transition
To congestion avoidance phase, thresholding Threshold2 then allows TCP flow enter congestion avoidance phase, thus reduces many numbers concurrently flowed
According to the deadline of stream, promote network throughput.
It is obvious that actual measurement shows that this method can effectively solve throughput collapse phenomenon, detailed in Example.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Fig. 2 is data center's TCP Incast scene schematic diagram.
Fig. 3 is concurrent time-out test result contrast, and Fig. 3 (a) is the throughput of lower 6 streams of DCTCP, and Fig. 3 (b) is the present invention
(GS-DCTCP) throughput of 6 streams time.
Fig. 4 is in the case of 25 working machines concurrently send data, phase between DCTCP agreement with the present invention (GS-DCTCP)
Pass reference index contrast, wherein service request unit SRU size is 512Kbytes；Fig. 4 (a) is that between different agreement, window becomes
Change situation contrasts；Fig. 4 (b) is TCP bag sequence number situation of change contrast between different agreement；Fig. 4 (c) is to exchange between different agreement
Machine queue length situation of change contrasts；Fig. 4 (d) is total throughput situation of change contrast between different agreement.
Fig. 5 is 64Kbytes for service request unit size, and different agreement is handled up along with transmitting terminal is the most increased number of
Rate contrasts.
Fig. 6 is 2Mbytes for the service total size of request unit, and different agreement is handled up along with transmitting terminal is the most increased number of
Rate contrasts.
Detailed description of the invention
Below with reference to the drawings and specific embodiments, the present invention is described in further details:
Embodiment 1:
See the flow chart that Fig. 1, Fig. 1 are the present invention: a kind of transmission controlling party based on multilevel congestion feedback in DCN
Method, process is as follows:
Initialize；Being dimensioned to 1 by initially sending window cwnd, first order queue labelling thresholding Threshold1 is arranged
Being 20, queue labelling thresholding Threshold2 in the second level is set to 65, congestion flag position ECT and CE is both configured to 0, slow turn-on
The mark ST in stage is set to 0；
After sender receives the whole confirmation bag ACK in currently transmitted window, according to all confirming the first order in bag ACK
Congestion flag position ECT and congestion marking congestion flag position, second level CE be set to 1 quantity calculate the first order and the second level congested
Degree α and β；
α=m/cwnd
β=n/cwnd
Wherein, m and n is all in being currently transmitted window respectively confirms first order congestion flag position ECT and second in bag ACK
The congested CE of level is set to the quantity of 1.
Transmitting terminal is masked as ST according to its slow turn-on and judges whether to keep slow start stage:
When ST is 0, then keep slow start stage, if all first order confirming bag ACK in currently transmitted window
Congestion flag position ECT is 0, then transmission window cwnd is updated to 2 × cwnd；And all in currently transmitted window confirm bag
When the first order congestion flag position ECT of ACK is not all 0, if all congested marks in the second level confirming bag ACK in currently transmitted window
CE position, will position is all 0, then transmission window cwnd is updated to cwnd+cwnd × (1 α)3；If in currently transmitted window all really
The CE position, congestion flag position, the second level recognizing bag ACK is not all 0, and putting slow turn-on flag bit ST is 1；
When ST is 1, exit slow start stage, enter congestion avoidance phase, confirm bag if all in currently transmitted window
The CE position, congestion flag position, the second level of ACK is all 0, then transmission window cwnd is updated to cwnd+1；Otherwise, according to network congestion
Degree adjusts and sends window size, and transmission window cwnd is updated to cwnd × (1 β/2)；
Transmitting terminal is by sending window cwnd size transmission data after updating, and judges whether data stream is sent, if
It is not sent, then data stream can be re-introduced into updating the step of network congestion degree and repeat said process, otherwise ties
Beam data transmits.
For verifying the effect of the present invention, NS2.35 network simulation platform carries out performance test.
Fig. 2 illustrates the canonical topology that TCP Incast occurs.In data-center applications, in order to ensure the high extension of service
Property and reliability, application data typically cutting is stored in different servers, and the data slot of each server storage is referred to as
Server request unit (Server Request Unit, SRU).Generally, lead in such a way inside data center
Letter: convergence server sends request of data to all working server.After each workspace server receives request of data, will transmission
The data slot stored, i.e. SRU.After convergence server receives the SRU of all requests, data slot is merged or processes,
Then next round request of data is sent.
Fig. 3 be concurrent time-out test in order to compare DCTCP and the inventive method (GS-DCTCP) less concurrently
The lower situation that time-out phenomenon occurs.Experimental situation is as follows: 7 working machines are linked into a switch via the link of 10Gbps,
Wherein 6 working machines send data to the 7th working machine simultaneously.6 data stream sizes are 512KB, and switch caching is
100pkts, link delay is 100 μ s.For DCTCP agreement, the value of switch queue labelling thresholding K is set to 65.For this
Bright, the value of switch multi-stage signature thresholding Threshold1 and Threshold2 is set to 20 and 65.
Finding out from Fig. 3 (a) and (b), DCTCP has occurred that when workspace server quantity is 6 what throughput collapsed shows
As, make throughput at a relatively high owing to slow start stage sending quickly increasing of window, but too swift and violent owing to increasing, cause
Congestion Avoidance occurs the phenomenon of time-out not in time.And GS-DCTCP of the present invention, by level threshold tagging mechanism, alleviate and open slowly
Send the excessively rapid growth of window so that avoid time-out phenomenon in the case of keeping throughput higher, prevent because of chain the dynamic stage
Road time delay is not mated with RTO re-transmission time and the situation that application performance drastically declines is occurred.
Fig. 4 is in the case of 25 working machines concurrently send data, coherent reference index contrast between different agreement, wherein
Service request unit SRU size is 512Kbytes.
Fig. 4 (a) can be seen that in DCTCP agreement, and all packets in whole transmission window are all lost, and waits 200ms
Rear re-transmission, link utilization is low.GS-DCTCP agreement of the present invention then alleviates window excessively rapid growth in time at slow start stage, it is to avoid
Whole window Loss.Too much there is time-out in Fig. 4 (b) display DCTCP agreement packet loss, and TCP bag sequence number is interrupted.The present invention then can to the greatest extent may be used
Packet loss can be reduced, it is to avoid time-out, effect is obvious.Fig. 4 (c) shows switch queuing situation, and wherein DCTCP agreement is led because of time-out
It is empty for causing queue, causes switch caching waste.The present invention then can be prevented effectively from cache overflow, it is ensured that link utilization.Fig. 4
D () is instantaneous total throughput situation, owing to increasing window is too fast, DCTCP agreement occurs that throughput collapses after taking bandwidth, time-out
Re-transmission causes link bandwidth waste serious.The present invention slows down increasing window the most in good time, congested by being transitioned into of smoothing of slow start stage
Avoiding the stage, make full use of link bandwidth, performance boost is obvious.
Fig. 5 is 64Kbytes for service request unit size, and different agreement is handled up along with transmitting terminal is the most increased number of
The contrast of rate.Owing to DCTCP agreement occurs in that time-out phenomenon, so throughput is the lowest, link utilization is low；And GS-of the present invention
DCTCP is owing to effectively avoiding hangover time-out, and throughput promotes substantially.Fig. 6 for the service total size of request unit is
2Mbytes, different agreement contrasts along with the concurrent increased number of throughput of transmitting terminal.It will be seen that the present invention assists relative to DCTCP
The throughput of view promotes effect and becomes apparent from.
Claims (4)
1. a transfer control method based on multilevel congestion feedback in DCN, it is characterised in that
Switch length of buffer queue threshold value is set: include first order queue labelling thresholding Threshold1 and second level queue mark
Note thresholding Threshold2；
Each switch monitoring current queue size when multiple senders send data concomitantly, on transmission path；Will be current
Queue length compares with first order queue labelling thresholding Threshold1 and second level queue labelling thresholding Threshold2, feedback
Current network congestion state；
According to the comparative result of current queue size with first order queue labelling thresholding Threshold1, i.e. first order congestion feedback
Alleviate the increasing window speed of slow turn-on；
According to the comparative result of current queue size with second level queue labelling thresholding Threshold2, i.e. second level congestion feedback
Exit slow start stage in time and enter congestion avoidance phase.
Transfer control method based on multilevel congestion feedback in DCN the most according to claim 1, it is characterised in that
Comprise the following steps:
Step one: initialize: arrange sender send window cwnd size initial value, arrange switch monitoring current queue long
Degree threshold value: include first order queue labelling thresholding Threshold1 and second level queue labelling thresholding Threshold2, number is set
According to bag first order congestion flag position ECT and the initial value of congestion flag position, second level CE, sender slow turn-on flag bit ST is set
Initial value be 0；
Step 2: each switch monitoring current queue size on transmission path, when current queue size exceedes first order queue
During labelling thresholding Threshold1, immediately the first order congestion flag position ECT of the packet in current queue is set to 1；When working as
When front queue length exceedes second level queue labelling thresholding Threshold2, then the second level of the packet in current queue is gathered around
Plug flag bit CE is set to 1；After packet arrives recipient, recipient confirms that to packet wrapping ACK stamps the congested of correspondence
Mark, and will confirm that bag ACK is sent to sender；
After sender receives the whole confirmation bag ACK in currently transmitted window, according to all confirming that in bag ACK, the first order is congested
Flag bit ECT and congestion flag position, second level CE is set to the quantity of 1 and calculates the first order and second level Congestion Level SPCC α and β；
Step 3: sender judges whether to keep slow start stage according to its slow turn-on flag bit ST, if ST is 0, then
Keep slow start stage and go to step four, otherwise exiting slow start stage, entering congestion avoidance phase, and go to step six；
Step 4: judge that the first order congestion flag position ECT of all confirmation bag ACK in currently transmitted window is 0,
If it is, transmission window cwnd is updated to 2 × cwnd, and proceed to step 8；Otherwise, five are gone to step；
Step 5: judge that congestion flag position, the second level CE of all confirmation bag ACK in currently transmitted window is 0, as
Fruit is that transmission window cwnd is then updated to cwnd+cwnd × (1 α)3, proceed to step 8；Otherwise, slow turn-on flag bit ST is put
It is 1, proceeds to step 8；
Step 6: judge that congestion flag position, the second level CE of all confirmation bag ACK in currently transmitted window is 0, as
Fruit is then transmission window cwnd to be updated to cwnd+1, proceed to step 8；Otherwise, step 7 is proceeded to；
Step 7: according to network congestion degree adjust send window size, transmission window cwnd is updated to cwnd × (1 β/
2), step 8 is proceeded to；
Step 8: transmitting terminal sends data by the transmission window cwnd size after updating, and judges whether data are sent, as
Fruit is not sent, and returns step 2, otherwise terminates data transmission.
Transfer control method based on multilevel congestion feedback in DCN the most according to claim 2, it is characterised in that
Described step one includes: being dimensioned to 1 by initially sending window cwnd, first order queue labelling thresholding Threshold1 is arranged
Being 20, queue labelling thresholding Threshold2 in the second level is set to 65, by the congested mark of first order congestion flag position ECT and the second level
Will position CE is both configured to 0.
Transfer control method based on multilevel congestion feedback in DCN the most according to claim 2, it is characterised in that
In described step 2:
After sender receives the whole confirmation bag ACK in currently transmitted window, according to all confirming that in bag ACK, the first order is congested
Flag bit ECT and congestion flag position, second level CE is set to the quantity of 1 and calculates the first order and second level Congestion Level SPCC α and β, calculates
Formula is:
α=m/cwnd
β=n/cwnd
Wherein, m and n is all in being currently transmitted window respectively confirms that in bag ACK, first order congestion flag position ECT and the second level are gathered around
Plug CE is set to the quantity of 1.
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