CN104009928A - Method and device for limiting speed of data flow - Google Patents
Method and device for limiting speed of data flow Download PDFInfo
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- CN104009928A CN104009928A CN201410224854.8A CN201410224854A CN104009928A CN 104009928 A CN104009928 A CN 104009928A CN 201410224854 A CN201410224854 A CN 201410224854A CN 104009928 A CN104009928 A CN 104009928A
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Abstract
The invention is applied to the technical field of flow control, and provides a method and device for limiting the speed of data flow. The method for limiting the speed of data flow comprises the steps that speed limiting type information for limiting the speed of the data flow is received, wherein a speed limiting type comprises a broadcasting speed limiting type or a multicast speed limiting type or a unicast speed limiting type; the current data package corresponding to the speed limiting type is matched, and the package length of the current data package is obtained; the time difference between the current moment and the last recording moment is calculated, the last recording moment is the starting moment of the current time quantum, and the duration of the current time quantum is assigned time; if the time difference is smaller than the assigned time, and the package length of the current data package is larger than the current data size allowed to pass through, the current data package is discarded. According to the method and device for limiting the speed of the data flow, the mode of carrying out speed limiting on the data flow without being based on the queue is achieved, the achieving difficulty for traditional speed limiting on the data flow is lowered greatly.
Description
Technical field
The invention belongs to flow control technique field, relate in particular to a kind of method and device that data stream is carried out to speed limit.
Background technology
Along with the develop rapidly of network technology, network-termination device is more and more, and user is also increasing to the demand of network.Although Virtual network operator is all improving upstream bandwidth every year, the raising speed of its upstream bandwidth is the increased requirement to network speed far away from users.The bandwidth of supposing certain network intermediate equipment is 10Mb/s, when user A uses the data-transformation facility of BitTorrent (claiming again bit-torrent or BT), transmission of video or the large flow of other needs, the upstream bandwidth of 10Mb/s can be even whole by the user A major part that accounts for, and cause the very poor network service that even cannot obtain of other user network service quality.
Therefore, for multi-user's online, for limited bandwidth, how ensureing that the network demand of every kind of business of each user can be initiated and process liberally, is an important job.
In prior art, in order to realize, data stream is carried out to speed limit, traffic policing (Traffic Policing) mechanism in the QoS (Quality of Service) that employing Linux carries.This mechanism is based on QDisc (Queuing Discipline, queue discipline), related queue and filter are of a great variety, and need to be in conjunction with application layer TC (Traffic Control, flow control) configuration tool, realizes difficulty high.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of method of data stream being carried out to speed limit, to reduce existing difficulty of data stream being carried out to the mode of speed limit.
The embodiment of the present invention is achieved in that a kind of method of data stream being carried out to speed limit, comprising:
Receive the speed limit type information that described data flow is carried out to speed limit, described speed limit type comprises broadcast speed limit, multicast speed limit or clean culture speed limit;
Mate current data packet corresponding to described speed limit type, and it is long to obtain the bag of described current data packet;
Calculate current time and last time difference of recording the moment, the described last time is recorded the zero hour that the moment is current slot, and the duration of described current slot is the fixed time;
If the described time difference is less than the described fixed time, and the bag of the described current data packet data volume of passing through in current permission of growing up, abandon described current data packet, the data volume that described current permission is passed through equals described current slot and allows the poor of data volume that the data volume passed through and described current slot passed through.
Another object of the embodiment of the present invention is to provide a kind of device that data stream is carried out to speed limit, comprising:
Speed limit type information receiver module, for receiving the speed limit type information that described data flow is carried out to speed limit, described speed limit type comprises broadcast speed limit, multicast speed limit or clean culture speed limit;
Current data packet matching module, for mating current data packet corresponding to described speed limit type, and it is long to obtain the bag of described current data packet;
Time difference computing module, for calculating current time and last time difference of recording the moment, the described last time is recorded the zero hour that the moment is current slot, and the duration of described current slot is the fixed time;
Current data packet discard module, be less than the described fixed time if be used for the described time difference, and the bag of the described current data packet data volume of passing through in current permission of growing up, abandon described current data packet, the data volume that described current permission is passed through equals described current slot and allows the poor of data volume that the data volume passed through and described current slot passed through.
The beneficial effect that the embodiment of the present invention compared with prior art exists is: the embodiment of the present invention is by receiving the speed limit type information that data stream is carried out to speed limit, current data packet corresponding to coupling speed limit type, in current slot, in the time that the bag of current data packet is grown up the data volume of passing through in current permission, abandon current data packet, realize thus the flow control of the data flow corresponding to speed limit type, and greatly reduced the difficulty that realizes of data stream being carried out to speed limit.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 be the embodiment of the present invention provide data stream is carried out to the realization flow figure of the method for speed limit;
Fig. 2 be the embodiment of the present invention provide data stream is carried out to the structured flowchart of the device of speed limit.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention is by receiving the speed limit type information that data stream is carried out to speed limit, current data packet corresponding to coupling speed limit type, in current slot, in the time that the bag of current data packet is grown up the data volume of passing through in current permission, abandon current data packet, realize thus the flow control of the data flow corresponding to speed limit type, and greatly reduced the difficulty that realizes of data stream being carried out to speed limit.
What Fig. 1 showed that the embodiment of the present invention provides carries out the realization flow figure of the method for speed limit to data stream, and details are as follows:
In S101, receive the speed limit type information that described data flow is carried out to speed limit, described speed limit type comprises broadcast speed limit, multicast speed limit or clean culture speed limit.
It should be noted that, the method that data stream is carried out to speed limit that the present embodiment provides is not based on queue, that is to say do not have queue to carry out buffer memory to the packet arriving, and the arrival of each packet is instant.In embodiments of the present invention, receive speed limit type information data flow corresponding to speed limit type carried out to speed limit.Wherein, speed limit type information comprises speed limit type and speed limit speed.Speed limit speed etc. allow the data volume passed through and the ratio of the duration of fixed time at fixed time.
Speed limit type, for broadcast speed limit, refers to the packet of broadcast type in data flow is carried out to speed limit.Wherein, when broadcast refers to packet and transmits in computer network, destination address is a kind of transmission means of all devices in network.Because broadcast need to take very large bandwidth, therefore as a rule, broadcast is all limited in local area network (LAN).Therefore, all devices in above-mentioned network refers to all devices in certain broadcast domain.At Ethernet and IPv4 (Internet Protocol version4, Internet Protocol Version 4) in net, IP (the Internet Protocol of broadcast, Internet protocol) address is 255.255.255.255, MAC (Media Access Control, medium access control) address is FF-FF-FF-FF-FF-FF.
Speed limit type is multicast speed limit, refers to the packet of multicast type in data flow is carried out to speed limit.Wherein, multicast refers to the network of realizing point-to-multipoint between sender and each recipient and is connected, and sender transmits identical packet to multiple recipients simultaneously.IANA (Internet Assigned Numbers Authority, the Internet digital distribution mechanism) be that 224.0.0.0 distributes to multicast ip address to 239.255.255.255 by D class address, first four of multicast ip address are 1110, and multicast ip address is 1110XXXX XXXX XXXX XXXX XXXX XXXX XXXX.High 24 of multicast mac address is Ox01005E, and the 25th is 0, and high 25 is fixed value.To be multicast ip address low 23 for low 23 of multicast mac address.Multicast mac address can be expressed as 0000000100000000010111000XXX XXXX XXXX XXXX XXXX XXXX.
Speed limit type is clean culture speed limit, refers to the packet of unicast type in data flow is carried out to speed limit.Wherein, clean culture refers to and between sender and recipient, realizes point-to-point network and be connected.The major part in category-A, category-B and C class address is distributed to clean culture by IANA.The 8th of unicast mac address is 0, i.e. XXXX XXX0XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX.
As an alternative embodiment of the invention, speed limit type also comprises total speed limit, and the packet to broadcast type, the packet of multicast type and the packet of unicast type all carry out speed limit.
In S102, mate current data packet corresponding to described speed limit type, and it is long to obtain the bag of described current data packet.
If speed limit type, for broadcast speed limit, is mated the current data packet that broadcast type is corresponding; If speed limit type is multicast speed limit, mate current data packet corresponding to multicast type; If speed limit type is clean culture speed limit, mate current data packet corresponding to unicast type.Current data packet refers to the packet that current time request sends.The bag length of current data packet refers to the size of current data packet.Long according to the bag of current data packet, can know the data volume required by current data packet.
Further, described in S102, mating current data packet corresponding to described speed limit type is specially:
According to the destination address in packet, judge the transport-type of described packet, then according to the transport-type of described packet, from described packet, mate current data packet corresponding to described speed limit type.In the embodiment of the present invention, according to the MAC Address in packet or IP address, can judge that the transport-type of this packet is broadcast, multicast or clean culture, then according to the transport-type of packet, coupling meets the current data packet of speed limit type.
In S103, calculate current time and last time difference of recording the moment, the described last time is recorded the zero hour that the moment is current slot, and the duration of described current slot is the fixed time.
In embodiments of the present invention, Time Calculation adopts ticktock number to represent, the ticktock number producing in a second is Hz, and Hz is approximately equal to 1.Current time represents that system is from starting to the ticktock number of present experience, and the last time records the moment and represents that system records from starting to the last time ticktock number that the moment experiences.The duration of current slot is the fixed time, and the fixed time is called again Time Calculation granularity.The scope of Time Calculation granularity advises 1 second～Hz/10 second (or being expressed as 1/Hz second～0.1 second), and the default value of Time Calculation granularity can be Hz/20 second, 0.05 second.The value of Time Calculation granularity can not be excessive, and the excessive stiffness of system that causes is low; The value of Time Calculation granularity can not be too small, and the too small system that may cause has little time current data packet to process.
The ticktock number of Time Calculation is from 0 to OxFFFFFFFF, and the ticktock number in the next moment that ticktock number is OxFFFFFFFF is 0, according to such circulation repeatedly.
In S104, if the described time difference is less than the described fixed time, and the bag of the described current data packet data volume of passing through in current permission of growing up, abandon described current data packet, the data volume that described current permission is passed through equals described current slot and allows the poor of data volume that the data volume passed through and described current slot passed through.
In current slot, if the bag length of current data packet is less than or equal to the data volume that current permission is passed through, pass through current data packet.In current slot, the data volume of passing through in current permission if the bag of current data packet is grown up, abandons current data packet, thus packet corresponding to speed limit type has been carried out to speed limit processing.
Further, described clean culture speed limit comprises Limit Rate, user's speed limit or business speed limit.
For Limit Rate, conventionally, an only virtual interface of a physical port, therefore, Limit Rate is equivalent to physical port speed limit.To consider the uncertain of interface quantity and the convenience in order searching, to adopt ltsh chain table to store the physical port that each interface is corresponding.The hash length of the ltsh chain table that Limit Rate is corresponding can customize, preferably, the quantitative value that the hash length of the ltsh chain table that Limit Rate is corresponding is physical port, for example, the hash length of the ltsh chain table that Limit Rate is corresponding is 8.The recording process that carrys out docking port below as an example of Linux standard kernel example describes: receive in the process of packet in Linux standard kernel, member variable iif corresponding to packet description scheme body struct skbuff recorded the interface sequence number that receives packet, the each interface of interface sequence number unique identification.
For user's speed limit, conventionally, a terminal belongs to a user, and therefore, user's speed limit is equivalent to terminal speed limit.To consider the uncertain of number of users and the convenience in order searching, to adopt ltsh chain table to store terminal corresponding to each user.In embodiments of the present invention, terminal adopts MAC Address to identify.The hash length of ltsh chain table corresponding to user's speed limit can customize, and preferably, the hash length of ltsh chain table corresponding to user's speed limit is the twice of the hash length of the ltsh chain table that Limit Rate is corresponding.
For business speed limit, conventionally, a corresponding business of special services port, or one group of corresponding business of continuous special services port, therefore, business speed limit is equivalent to the speed limit of serve port in particular range section.To consider the uncertain of number of services and the convenience in order searching, to adopt ltsh chain table to store serve port corresponding to each business.IANA to well-known port, distributes to dynamic port by 1024～65536 by 0～1023 port number assignment, and wherein, 1024～32768 is the interim serve port of acquiescence, and 32769～61000 is random port.Therefore, service port number is less than random port number.In packet, source port adopts service port number, and destination interface adopts random port number, therefore, give serve port by source port and destination interface middle-end slogan smaller, reexamine the affiliated business of serve port, just can obtain the corresponding relation of business and serve port.The hash length of ltsh chain table corresponding to business speed limit can customize, and preferably, the hash length of ltsh chain table corresponding to business speed limit is the maximum evolution of following the tracks of number that connects.Wherein, maximum connect to follow the tracks of severally calculates according to internal memory, the connection of most of routers is followed the tracks of number and is generally 4096, therefore the hash length of ltsh chain table corresponding to business speed limit adopts 64.
Further, in the time that described speed limit type is described Limit Rate, described in S102, mates current data packet corresponding to described speed limit type and be specially:
Speed limit node corresponding to matched interfaces from ltsh chain table corresponding to the described Limit Rate that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
For Limit Rate, if can not find the physical port that specified interface is corresponding from ltsh chain table corresponding to Limit Rate, the corresponding relation of newly-built this specified interface and physical port, and this specified interface is joined in the ltsh chain table that Limit Rate is corresponding with the corresponding relation of physical port.
Further, in the time that described speed limit type is described user's speed limit, described in S102, mates current data packet corresponding to described speed limit type and be specially:
Speed limit node corresponding to match user from ltsh chain table corresponding to described user's speed limit of being pre-created, to carry out speed limit to the current data packet in described speed limit node.
For user's speed limit, if can not find the terminal that designated user is corresponding from ltsh chain table corresponding to user's speed limit, the corresponding relation of newly-built this designated user and terminal, and this designated user and the corresponding relation of terminal are joined in ltsh chain table corresponding to user's speed limit.
Further, in the time that described speed limit type is described business speed limit, described in S102, mates current data packet corresponding to described speed limit type and be specially:
Speed limit node corresponding to coupling business from ltsh chain table corresponding to the described business speed limit that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
For business speed limit, if can not find serve port corresponding to specified services from ltsh chain table corresponding to business speed limit, the corresponding relation of newly-built this specified services and serve port, and this specified services and the corresponding relation of serve port are joined in ltsh chain table corresponding to business speed limit.
The embodiment of the present invention is by receiving the speed limit type information that data stream is carried out to speed limit, current data packet corresponding to coupling speed limit type, in current slot, in the time that the bag of current data packet is grown up the data volume of passing through in current permission, abandon current data packet, realize thus the flow control of the data flow corresponding to speed limit type, and greatly reduced the difficulty that realizes of data stream being carried out to speed limit.
What Fig. 2 showed that the embodiment of the present invention provides carries out the structured flowchart of the device of speed limit to data stream, and this device is for carrying out the method for speed limit to data stream described in service chart 1.For convenience of explanation, only show the part relevant to the present embodiment.
With reference to Fig. 2, this device comprises:
Speed limit type information receiver module 21, receives the speed limit type information that described data flow is carried out to speed limit, and described speed limit type comprises broadcast speed limit, multicast speed limit or clean culture speed limit.
Current data packet matching module 22, mates current data packet corresponding to described speed limit type, and it is long to obtain the bag of described current data packet.
Time difference computing module 23, calculates current time and last time difference of recording the moment, and the described last time is recorded the zero hour that the moment is current slot, and the duration of described current slot is the fixed time.
Current data packet discard module 24, if the described time difference is less than the described fixed time, and the bag of the described current data packet data volume of passing through in current permission of growing up, abandon described current data packet, the data volume that described current permission is passed through equals described current slot and allows the poor of data volume that the data volume passed through and described current slot passed through.
Further, described clean culture speed limit comprises Limit Rate, user's speed limit or business speed limit.
Further, in the time that described speed limit type is described Limit Rate, described current data packet matching module 22 specifically for:
Speed limit node corresponding to matched interfaces from ltsh chain table corresponding to the described Limit Rate that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
Further, in the time that described speed limit type is described user's speed limit, described current data packet matching module 22 specifically for:
Speed limit node corresponding to match user from ltsh chain table corresponding to described user's speed limit of being pre-created, to carry out speed limit to the current data packet in described speed limit node.
Further, in the time that described speed limit type is described business speed limit, described current data packet matching module 22 specifically for:
Speed limit node corresponding to coupling business from ltsh chain table corresponding to the described business speed limit that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
The embodiment of the present invention is by receiving the speed limit type information that data stream is carried out to speed limit, current data packet corresponding to coupling speed limit type, in current slot, in the time that the bag of current data packet is grown up the data volume of passing through in current permission, abandon current data packet, realize thus the flow control of the data flow corresponding to speed limit type, and greatly reduced the difficulty that realizes of data stream being carried out to speed limit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a method of data stream being carried out to speed limit, is characterized in that, comprising:
Receive the speed limit type information that described data flow is carried out to speed limit, described speed limit type comprises broadcast speed limit, multicast speed limit or clean culture speed limit;
Mate current data packet corresponding to described speed limit type, and it is long to obtain the bag of described current data packet;
Calculate current time and last time difference of recording the moment, the described last time is recorded the zero hour that the moment is current slot, and the duration of described current slot is the fixed time;
If the described time difference is less than the described fixed time, and the bag of the described current data packet data volume of passing through in current permission of growing up, abandon described current data packet, the data volume that described current permission is passed through equals described current slot and allows the poor of data volume that the data volume passed through and described current slot passed through.
2. the method for claim 1, is characterized in that, described clean culture speed limit comprises Limit Rate, user's speed limit or business speed limit.
3. method as claimed in claim 2, is characterized in that, in the time that described speed limit type is described Limit Rate, current data packet corresponding to the described speed limit type of described coupling is specially:
Speed limit node corresponding to matched interfaces from ltsh chain table corresponding to the described Limit Rate that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
4. method as claimed in claim 2, is characterized in that, in the time that described speed limit type is described user's speed limit, current data packet corresponding to the described speed limit type of described coupling is specially:
Speed limit node corresponding to match user from ltsh chain table corresponding to described user's speed limit of being pre-created, to carry out speed limit to the current data packet in described speed limit node.
5. method as claimed in claim 2, is characterized in that, in the time that described speed limit type is described business speed limit, current data packet corresponding to the described speed limit type of described coupling is specially:
Speed limit node corresponding to coupling business from ltsh chain table corresponding to the described business speed limit that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
6. a device that data stream is carried out to speed limit, is characterized in that, comprising:
Speed limit type information receiver module, for receiving the speed limit type information that described data flow is carried out to speed limit, described speed limit type comprises broadcast speed limit, multicast speed limit or clean culture speed limit;
Current data packet matching module, for mating current data packet corresponding to described speed limit type, and it is long to obtain the bag of described current data packet;
Time difference computing module, for calculating current time and last time difference of recording the moment, the described last time is recorded the zero hour that the moment is current slot, and the duration of described current slot is the fixed time;
Current data packet discard module, be less than the described fixed time if be used for the described time difference, and the bag of the described current data packet data volume of passing through in current permission of growing up, abandon described current data packet, the data volume that described current permission is passed through equals described current slot and allows the poor of data volume that the data volume passed through and described current slot passed through.
7. device as claimed in claim 6, is characterized in that, described clean culture speed limit comprises Limit Rate, user's speed limit or business speed limit.
8. device as claimed in claim 7, is characterized in that, in the time that described speed limit type is described Limit Rate, described current data packet matching module specifically for:
Speed limit node corresponding to matched interfaces from ltsh chain table corresponding to the described Limit Rate that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
9. device as claimed in claim 7, is characterized in that, in the time that described speed limit type is described user's speed limit, described current data packet matching module specifically for:
Speed limit node corresponding to match user from ltsh chain table corresponding to described user's speed limit of being pre-created, to carry out speed limit to the current data packet in described speed limit node.
10. device as claimed in claim 7, is characterized in that, in the time that described speed limit type is described business speed limit, described current data packet matching module specifically for:
Speed limit node corresponding to coupling business from ltsh chain table corresponding to the described business speed limit that is pre-created, to carry out speed limit to the current data packet in described speed limit node.
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