CN109150743B - Network congestion control strategy switching method and system - Google Patents
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Abstract
The embodiment of the invention provides a method and a system for switching network congestion control strategies, wherein the method comprises the following steps: acquiring state information of network connection in a network protocol stack; according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the current network connection; and switching the congestion control strategy in the network protocol stack into a first congestion control strategy. The method provided by the invention selects the congestion control algorithm suitable for the network connection according to the characteristics of different connections, and can select different algorithms for each network connection at different time stages so as to adapt to the dynamic change of factors such as network load and the like.
Description
Technical Field
The embodiment of the invention relates to the technical field of network congestion control, in particular to a method and a system for switching network congestion control strategies.
Background
Congestion refers to the phenomenon that a certain part of a communication subnet is too many packets, so that the part of the communication subnet is too late for processing, and the performance of the part and even the whole network is reduced, and in a serious case, the network communication service is stopped, namely, a deadlock phenomenon occurs.
The basic function of congestion control is to adjust the rate of packet injection into the resource sharing network, maximize the utilization rate of network resources, realize fair statistical multiplexing of resources by users, and avoid congestion collapse. With the popularization and spread of large-scale internet application with intensive calculation and storage at a server side and outstanding diversity and heterogeneity of intensive concurrent connection of the server, the basic idea that the traditional congestion control method uses a single strategy to deal with the diversity and heterogeneity of the connection is increasingly inappropriate, and the common characteristic of numerous concurrent connections cannot be utilized to optimize the network transmission performance. Specifically, the server network connection has the following features: 1. due to the wide variety of types of heterogeneous access networks, such as WiFi, cellular networks, broadband access, ethernet, etc., different connections of the same server are in distinct network environments; 2. network load has significantly different dynamic change characteristics at different time granularity and spatial scales, and network connections consequently show different spatio-temporal characteristics. In order to improve the performance of the server-side congestion control with dense connections, the space-time characteristics, i.e. heterogeneity and variability, of the connections thereon need to be fully considered and mined.
In the prior art, as shown in fig. 1, although there may be a significant difference between the access network and the operator network, the conventional congestion control method for the internet implements the same congestion control strategy for multiple network connections, and the example CUBIC algorithm in the figure is a default algorithm of a Linux kernel protocol stack.
Disclosure of Invention
Embodiments of the present invention provide a method and a system for switching network congestion control policies, so as to solve the problem that in the congestion control process in the prior art, congestion control can be performed on all network connections only through a single congestion control policy, and the method and the system cannot adapt to the heterogeneity of network connections and the dynamic change of network conditions.
The embodiment of the invention provides a network congestion control strategy switching method, which comprises the following steps:
acquiring state information of network connection in a network protocol stack;
according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the current network connection;
and switching the congestion control strategy in the network protocol stack into a first congestion control strategy.
Wherein, the state information of the network connection in the network protocol stack at least comprises: one or more of an ACK signal, a NACK signal, a time-out retransmission signal, a round-trip delay, available bandwidth, and a packet loss rate.
The step of matching the first congestion control policy adapted to the state information of the current network connection according to the state information of the network connection specifically includes:
acquiring the network characteristics of the network connection according to the state information of the network connection; and matching the adaptive first congestion network control strategy by a method of display matching or implicit mapping according to the network characteristics.
Wherein, in the step of switching the congestion control policy in the network protocol stack to the first congestion control policy, the method further comprises:
when the implementation manners of the congestion control strategy and the first congestion control strategy in the network protocol stack are different, according to a formula:
rate-congestion window/last round trip delay,
and realizing the conversion of the congestion window and the congestion rate in the first congestion control strategy.
Wherein, the step of obtaining the status information of the network connection in the network protocol stack comprises:
and simultaneously acquiring the state information of the network connection of a TCP layer and an HTTP layer, or acquiring the state information of the network connection above a UDP transmission layer.
An embodiment of the present invention further provides a network congestion control policy switching system, including:
the information acquisition module is used for acquiring the state information of network connection in the network protocol stack;
the selection module is used for matching a first congestion control strategy adapted to the state information of the current network connection according to the state information of the network connection;
and the switching module is used for switching the congestion control strategy in the network protocol stack into a first congestion control strategy.
Wherein the selection module is specifically configured to: acquiring the network characteristics of the network connection according to the state information of the network connection; and matching the adaptive first congestion network control strategy by a method of display matching or implicit mapping according to the network characteristics.
Wherein the algorithm switching module is further configured to: when the implementation manners of the congestion control strategy and the first congestion control strategy in the network protocol stack are different, according to a formula:
rate-congestion window/last round trip delay,
and realizing the conversion of the congestion window and the congestion rate in the first congestion control strategy.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the network congestion control policy switching method described above.
An embodiment of the present invention further provides a network congestion control policy switching device, including:
at least one processor; and at least one memory coupled to the processor, wherein: the memory stores program instructions executable by the processor, the processor invoking the program instructions to enable performance of the network congestion control policy switching method as described above.
According to the network congestion control strategy switching method and system provided by the embodiment of the invention, the congestion control algorithm suitable for the network connection is selected for the network connection according to the characteristics of different connections, and different algorithms can be selected for each network connection at different time stages so as to adapt to the dynamic change of factors such as network load and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a congestion control system in the prior art;
fig. 2 is a flowchart illustrating a network congestion control policy switching method according to an embodiment of the present invention;
fig. 3 is a system framework diagram in a network congestion control policy switching method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a network congestion control policy switching system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a network congestion control policy switching system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a network congestion control policy switching device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic flowchart of a network congestion control policy switching method according to an embodiment of the present invention, where the method includes:
and S1, acquiring the state information of the network connection in the network protocol stack.
And S2, according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the current network connection.
And S3, switching the congestion control strategy in the network protocol stack to a first congestion control strategy.
Specifically, when performing congestion control policy switching, first, status information of network connections in a network protocol stack is collected. Wherein, the state information of the network connection in the network protocol stack at least comprises: one or more of an ACK signal, a NACK signal, a Retransmission Timeout (RTO), a Round-Trip Time (RTT), an available Bandwidth (Bandwidth), and a Loss rate (Loss rate).
After the network connection state information in the network protocol stack is acquired, the network connection state information is analyzed, the network characteristics of each connection running in the server are identified, and an adaptive congestion control strategy, namely a first congestion control strategy, is matched according to the network characteristics.
And after the first congestion control strategy is matched, switching the first congestion control strategy into a congestion control strategy used in a network protocol stack. In specific implementation, the initial state of the new strategy is set as a bandwidth detection state, so that the related variables of the new strategy are adaptively updated in detection.
By the method, the congestion control algorithm suitable for the network connection is selected for the network connection according to the characteristics of different connections, and different algorithms can be selected for each network connection at different time stages so as to adapt to the dynamic change of factors such as network load and the like.
On the basis of the foregoing embodiment, the step of matching, according to the state information of the network connection, the first congestion control policy that is adapted to the state information of the current network connection specifically includes:
acquiring the network characteristics of the network connection according to the state information of the network connection; and matching the adaptive first congestion network control strategy by a method of display matching or implicit mapping according to the network characteristics.
Specifically, as shown in fig. 3, in the data collection phase, when the connection receives feedback information from the network each Time, such as an Acknowledgement (ACK) packet arrives or a Retransmission Timeout (RTO) occurs, the agent extracts monitoring information of a related event or state, such as Round-Trip Time (RTT), available Bandwidth (Bandwidth), and Loss rate (Loss rate), from the network protocol stack, and then writes the monitoring information into the uplink pipe.
The selector identifies the network characteristics of each connection running in the server according to the state monitoring information, and then displays a congestion control strategy adapted to matching or implicit mapping according to the rules. In the whole interaction process, the selector reads and analyzes monitoring data collected by the agents from the uplink pipeline, and the selector informs the agents running in the kernel of switching a suitable congestion control strategy for connection through the downlink pipeline.
On the basis of the foregoing embodiment, in the step of switching the congestion control policy in the network protocol stack to the first congestion control policy, the method further includes:
when the implementation manners of the congestion control strategy and the first congestion control strategy in the network protocol stack are different, according to a formula:
rate-congestion window/last round trip delay,
and realizing the conversion of the congestion window and the congestion rate in the first congestion control strategy.
Specifically, referring to fig. 3, in order to ensure the smoothness of the congestion control policy switching, the agent needs to complete the entire switching process in three steps, and first explicitly maintains common observation variables for each connection, including the minimum round-trip delay, the maximum congestion window, the maximum available bandwidth, and the like.
Secondly, when policy switching needs to be performed, in order to avoid a sharp drop in the performance of a connection, the new policy needs to extend the congestion Window or Rate of the old algorithm, and if one of the new and old policies is implemented based on Window (Window-based) and the other is implemented based on Rate-based (Rate-based), the following equation is used to convert the new and old policies into the new and old policies
Rate-congestion window/latest round trip delay
For example, when the original congestion control policy in the network protocol stack is a congestion control policy based on a congestion window and the first congestion control policy is a congestion control policy based on a rate, the conversion mode of the congestion window and the network rate is determined by the formula: the rate is the congestion window/most recent round trip delay and the transition is made. For other variables, assigning values by using the variables maintained in the first step as much as possible; if the old policy does not maintain the state variables needed by the new policy, assigning an initial value to the default value of the new policy
And finally, setting the initial state of the new strategy as a bandwidth detection state, and enabling related variables of the new strategy to be adaptively updated in detection.
On the basis of the foregoing embodiment, the step of acquiring status information of network connection in a network protocol stack includes: and simultaneously acquiring the state information of the network connection of a TCP layer and an HTTP layer, or acquiring the state information of the network connection above a UDP transmission layer.
Specifically, in another embodiment, in the network data acquisition, data may be extracted from a network protocol stack other than the kernel protocol stack of the operating system, such as a user space protocol stack, to select a congestion control policy;
congestion control policies may also be selected and configured for connections online using network data collected offline rather than real-time data;
meanwhile, network data of different layers can be collected from a network protocol stack for analysis and congestion control strategies can be selected, such as collecting network data of a TCP layer and an HTTP layer at the same time, or collecting network data above a UDP transmission layer.
The congestion control policy selected based on the data analysis may be implemented not in the operating system kernel, but in the user space.
The congestion control strategy selected after the analysis based on the network state information can be completed by a preset rule or realized by a pre-constructed neural network and other modes.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a network congestion control policy switching system according to an embodiment of the present invention, where the system includes: an information acquisition module 41, a selection module 42 and a switching module 43.
The information obtaining module 41 is configured to obtain status information of network connection in a network protocol stack.
The selection module 42 is configured to match a first congestion control policy adapted to the status information of the current network connection according to the status information of the network connection.
The switching module 43 is configured to switch the congestion control policy in the network protocol stack to the first congestion control policy.
Specifically, when performing congestion control policy switching, first, status information of network connections in a network protocol stack is collected. Wherein, the state information of the network connection in the network protocol stack at least comprises: one or more of an ACK signal, a NACK signal, a Retransmission Timeout (RTO), a Round-Trip Time (RTT), an available Bandwidth (Bandwidth), and a Loss rate (Loss rate).
After the network connection state information in the network protocol stack is acquired, the network connection state information is analyzed, the network characteristics of each connection running in the server are identified, and an adaptive congestion control strategy, namely a first congestion control strategy, is matched according to the network characteristics.
And after the first congestion control strategy is matched, switching the first congestion control strategy into a congestion control strategy used in a network protocol stack. In specific implementation, the initial state of the new strategy is set as a bandwidth detection state, so that the related variables of the new strategy are adaptively updated in detection.
Through the system, the congestion control algorithm suitable for the network connection is selected for the network connection according to the characteristics of the different connections, and different algorithms can be selected for each network connection at different time stages so as to adapt to the dynamic change of factors such as network load and the like.
On the basis of the above embodiment, the selection module is specifically configured to:
acquiring the network characteristics of the network connection according to the state information of the network connection; and matching the adaptive first congestion network control strategy by a method of display matching or implicit mapping according to the network characteristics.
The algorithm switching module is further configured to: when the implementation manners of the congestion control strategy and the first congestion control strategy in the network protocol stack are different, according to a formula: and converting the congestion window and the rate in the first congestion control strategy.
Specifically, referring to the system framework diagram shown in fig. 3, the agent, which runs in the kernel space, includes an information acquisition module and a switching module, where the information acquisition module is used for data collection: each Time a connection receives feedback information from the network, such as an Acknowledgement (ACK) packet arrival or a Retransmission Timeout (RTO) and the like, the agent extracts monitoring information of a related event or state, such as Round-Trip Time (RTT), available Bandwidth (Bandwidth), Loss rate (Loss rate) and the like, from a network protocol stack, and then writes them into an uplink pipe,
the selector is a selection module and runs in the same server or other servers. Data is read from the upstream pipe, the data is analyzed to identify the characteristics of each connection and select an appropriate congestion control policy for the connection according to a given rule, and then the algorithm name is written into the downstream pipe.
The selector maintains a corresponding state for each network connection in the memory, the selector updates the state of the corresponding connection with the data each time the data is read from the uplink pipeline, and when the state update is completed, if the state and a given rule show that the connection needs to be switched with an algorithm, the selector writes a notification of the switching algorithm into the downlink pipeline. To improve the efficiency of implementation, the selector reads data in the pipeline using Batch processing (Batch processing), where a Batch of data is read and written at a time instead of a single data.
The switching module is used for executing the switching of the congestion control strategy, in order to ensure the smoothness of the switching of the congestion control strategy, the agent needs to complete the whole switching process in three steps, and firstly, commonly used observation variables including minimum round-trip delay, maximum congestion window, maximum available bandwidth and the like are explicitly maintained for each connection.
Secondly, when policy switching needs to be performed, in order to avoid a sharp drop in the performance of a connection, the new policy needs to extend the congestion Window or Rate of the old algorithm, and if one of the new and old policies is implemented based on Window (Window-based) and the other is implemented based on Rate-based (Rate-based), the following equation is used to convert the new and old policies into the new and old policies
Rate-congestion window/latest round trip delay
For example, when the original congestion control policy in the network protocol stack is a congestion control policy based on a congestion window and the first congestion control policy is a congestion control policy based on a rate, the conversion mode of the congestion window and the network rate is determined by the formula: the rate is the congestion window/most recent round trip delay and the transition is made. For other variables, assigning values by using the variables maintained in the first step as much as possible; if the old policy does not maintain the state variables needed by the new policy, assigning an initial value to the default value of the new policy
And finally, setting the initial state of the new strategy as a bandwidth detection state, and enabling related variables of the new strategy to be adaptively updated in detection.
In another embodiment of the present invention, the present embodiment supports a multi-core CPU architecture, and adopts a Per-core structure (Per-core structure): when deployed in a multi-core environment, there is no contention for data between cores, and each core runs its own functional component independently and provides services for all connections on that core. Meanwhile, as shown in fig. 5, the invention also supports a multi-server scenario, that is, network monitoring or historical data of multiple servers are gathered on one server to realize the function of a selector in a centralized manner, and dynamic configuration of a congestion control algorithm running on-line connection on the multiple servers is supported.
Fig. 6 illustrates a schematic structural diagram of a network congestion control policy switching device, and as shown in fig. 6, the server may include: a processor (processor)610, a memory (memory)630, and a bus 640, wherein the processor 610 and the memory 630 communicate with each other via the bus 640. The processor 610 may call logic instructions in the memory 630 to perform the following method: acquiring state information of network connection in a network protocol stack; according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the current network connection; and switching the congestion control strategy in the network protocol stack into a first congestion control strategy.
The present embodiments also provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, enable the computer to perform the methods provided by the above-described method embodiments, for example, including: acquiring state information of network connection in a network protocol stack; according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the current network connection; and switching the congestion control strategy in the network protocol stack into a first congestion control strategy.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: acquiring state information of network connection in a network protocol stack; according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the current network connection; and switching the congestion control strategy in the network protocol stack into a first congestion control strategy.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A network congestion control policy switching method is characterized by comprising the following steps:
acquiring state information of network connection in a network protocol stack;
according to the state information of the network connection, matching a first congestion control strategy adapted to the state information of the network connection;
switching the congestion control strategy in the network protocol stack to a first congestion control strategy;
in the step of switching the congestion control policy in the network protocol stack to the first congestion control policy, the method further includes:
when the implementation manners of the congestion control strategy and the first congestion control strategy in the network protocol stack are different, according to a formula:
rate = congestion window/last round trip delay,
implementing a transition of congestion windows and rates in the first congestion control policy;
under the condition that the congestion control strategy in the network protocol stack does not have the state variable required by the first congestion control strategy, taking the default value of the first congestion control strategy as the initial value of the required state variable;
under the condition that the congestion control strategy in the network protocol stack has the state variable required by the first congestion control strategy, taking the value of the state variable corresponding to the congestion control strategy in the network protocol stack as the initial value of the required state variable;
and setting the initial state of the first congestion control policy to a bandwidth probing state.
2. The method of claim 1, wherein the status information of the network connection in the network protocol stack comprises at least: one or more of an ACK signal, a NACK signal, a time-out retransmission signal, a round-trip delay, available bandwidth, and a packet loss rate.
3. The method according to claim 1, wherein the step of matching the first congestion control policy adapted to the status information of the network connection according to the status information of the network connection specifically comprises:
acquiring the network characteristics of the network connection according to the state information of the network connection;
and matching the adaptive first congestion network control strategy by a method of display matching or implicit mapping according to the network characteristics.
4. The method of claim 1, wherein the step of obtaining status information of network connections in a network protocol stack comprises:
and simultaneously acquiring the state information of the network connection of a TCP layer and an HTTP layer, or acquiring the state information of the network connection above a UDP transmission layer.
5. A network congestion control policy switching system, comprising:
the information acquisition module is used for acquiring the state information of network connection in the network protocol stack;
the selection module is used for matching a first congestion control strategy adapted to the state information of the network connection according to the state information of the network connection;
the switching module is used for switching the congestion control strategy in the network protocol stack into a first congestion control strategy;
the switching module is further configured to: when the implementation manners of the congestion control strategy and the first congestion control strategy in the network protocol stack are different, according to a formula:
rate = congestion window/last round trip delay,
implementing a transition of congestion windows and rates in the first congestion control policy;
under the condition that the congestion control strategy in the network protocol stack does not have the state variable required by the first congestion control strategy, taking the default value of the first congestion control strategy as the initial value of the required state variable;
under the condition that the congestion control strategy in the network protocol stack has the state variable required by the first congestion control strategy, taking the value of the state variable corresponding to the congestion control strategy in the network protocol stack as the initial value of the required state variable;
and setting the initial state of the first congestion control policy to a bandwidth probing state.
6. The system of claim 5, wherein the selection module is specifically configured to:
acquiring the network characteristics of the network connection according to the state information of the network connection;
and matching the adaptive first congestion network control strategy by a method of display matching or implicit mapping according to the network characteristics.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
8. A network congestion control policy switching apparatus, comprising:
at least one processor; and at least one memory coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 4.
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