CN114374652B - Data transmission speed limiting method and device between thermomagnetic storage and blue light storage - Google Patents
Data transmission speed limiting method and device between thermomagnetic storage and blue light storage Download PDFInfo
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- CN114374652B CN114374652B CN202210023928.6A CN202210023928A CN114374652B CN 114374652 B CN114374652 B CN 114374652B CN 202210023928 A CN202210023928 A CN 202210023928A CN 114374652 B CN114374652 B CN 114374652B
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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
- H04L47/215—Flow control; Congestion control using token-bucket
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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
- H04L47/20—Traffic policing
Abstract
The invention relates to a data transmission speed limiting method and device between thermomagnetic storage and blue light storage, wherein the method comprises the steps of determining task grades of tenants and setting speed limiting configuration items according to the task grades; the speed limiting configuration item is used for limiting the bandwidth speed; when data transmission is needed, obtaining tokens from a token bucket according to the speed limit configuration items; wherein the token bucket is filled with a preset number of tokens at preset time intervals, and each token represents data allowing transmission of a preset number of bytes; when enough tokens are acquired, data transmission is started. The invention aims to solve the problem of speed limitation of tenant level and task level, when a user transmits an object, the object is transmitted according to the speed limitation value acquired by the tenant, the transmission speed does not exceed the speed limitation value, the tenant can configure the weight of the archiving task when creating the archiving task, three weight options of high, medium and low are provided for the user at present, the task with high weight is transmitted at a higher speed.
Description
Technical Field
The invention belongs to the technical field of data communication, and particularly relates to a data transmission speed limiting method and device between thermomagnetic storage and blue light storage.
Background
S3 is theoretically a global Storage Area Network (SAN) which represents an oversized hard disk in which digital assets can be stored and retrieved. The assets stored and retrieved in S3 are referred to as objects. Objects are stored in a memory segment (bucket), which can be analogized with a hard disk: the object is like a file and the memory segment is like a folder (or directory). As with the hard disk, objects and memory segments can also be looked up by uniform resource identifiers (Uniform Resource Identifier, URI).
Blue light or blu-ray disc reads and writes data with a blue laser of a shorter wavelength and is therefore named. Blue light greatly increases the storage capacity of optical discs, providing an opportunity for jumping for optical storage products.
In the actual use process, in order to limit the speed of the tenant and reduce the burst flow on the network, the flow control is generally performed through a token bucket, the token bucket is based on the principle that the system can put the token into the bucket at a constant speed, and if the request needs to be processed, a token needs to be acquired from the bucket first, and when no token is advisable in the bucket, the service is refused. In the related technology, the token bucket algorithm is utilized by the redis database and the lua script code, so that the problem of speed limitation of tenants in the concurrent process can be well solved, but the requirement of people on task grade speed limitation cannot be met.
Disclosure of Invention
In view of the above, the invention aims to overcome the defects of the prior art, and provides a data transmission speed limiting method and device between thermomagnetic storage and blue light storage, so as to solve the problem that the prior art cannot meet the demands of people on task level speed limiting by using a token bucket algorithm.
In order to achieve the above purpose, the invention adopts the following technical scheme: a data transmission rate limiting method between thermomagnetic storage and blue light storage, comprising:
determining a task grade of a tenant, and setting a speed limiting configuration item according to the task grade; the speed limiting configuration item is used for limiting the bandwidth speed;
when data transmission is needed, obtaining tokens from the token bucket according to the speed limiting configuration items; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes;
when enough tokens are acquired, data transmission is started.
Further, the obtaining the tokens from the token bucket according to the speed limit configuration item includes:
determining task levels, the task levels including high, medium and low levels;
taking tokens from the token bucket according to the sequence of the high level, the medium level and the low level, waiting for the corresponding waiting time set by the corresponding task level after each token taking, and taking the tokens from the token bucket again; wherein the number of tokens taken each time is 1% of the bandwidth speed.
Further, when the token bucket is full and can not continue to put tokens, stopping adding new tokens;
when the token bucket is empty and cannot take tokens, service is denied.
Further, the waiting time corresponding to the task level includes:
the waiting time corresponding to the high level is smaller than the waiting time corresponding to the medium level, and the waiting time corresponding to the medium level is smaller than the waiting time corresponding to the low level.
Further, the waiting time for the higher stage is 0.01 seconds, the waiting time for the middle stage is 0.05 seconds, and the waiting time for the lower stage is 0.1 seconds.
Further, the token bucket is provided with the token quantity corresponding to the bandwidth speed at preset time.
Further, the bandwidth of the speed limiting configuration item is greater than or equal to 50M.
The embodiment of the application provides a data transmission speed limiting device between thermomagnetic storage and blue light storage, which comprises:
the determining module is used for determining the tenant level and the task level and setting a speed limit configuration item according to the tenant level and the task level; the speed limiting configuration item is used for limiting the bandwidth speed;
the acquisition module is used for acquiring tokens from the token bucket according to the speed limiting configuration items when data transmission is needed; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes;
and the transmission module is used for starting data transmission when enough tokens are acquired.
An embodiment of the present application provides a computer device, including: a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the method of limiting speed of data transfer between thermo-magnetic storage and blue light storage provided by any one of the embodiments described above
An embodiment of the present application provides a computer storage medium storing a computer program, where the computer program when executed by a processor causes the processor to perform the method for limiting speed of data transmission between thermo-magnetic storage and blue light storage provided in any one of the embodiments above.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention provides a data transmission speed limiting method and device between thermomagnetic storage and blue light storage, which realize speed limiting according to the task level of a tenant by arranging a token bucket on a data transmission route between the thermomagnetic storage and the blue light storage, when a user transmits an object, the speed limiting value obtained by the tenant is used for transmission, the transmission speed does not exceed the speed limiting value, the class of an archiving task can be configured when the tenant creates the archiving task, three class options of high, medium and low are provided for the user at present, the class of the task is high, and the transmission speed is faster.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the steps of a method for limiting speed of data transmission between thermomagnetic storage and blue light storage according to the present invention;
FIG. 2 is a schematic diagram of the token bucket algorithm of the present invention;
FIG. 3 is a flow chart of a method for limiting speed of data transmission between thermomagnetic storage and blue light storage according to the present invention;
fig. 4 is a schematic structural diagram of a data transmission speed limiting device between thermomagnetic storage and blue light storage according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
The following describes a specific method and device for limiting data transmission speed between thermomagnetic storage and blue light storage according to the embodiments of the present application with reference to the accompanying drawings.
As shown in fig. 1, the data transmission speed limiting method between the thermo-magnetic storage and the blue light storage provided in the embodiment of the application includes:
s101, determining a task grade of a tenant, and setting a speed limit configuration item according to the task grade; the speed limiting configuration item is used for limiting the bandwidth speed;
firstly, carrying out grade limitation on data transmission tasks of tenants, and then setting a speed limit configuration item according to the task grade, wherein the speed limit configuration item comprises a speed maximum bandwidth, namely the data transmission speed cannot exceed the speed maximum bandwidth, in the application, the speed maximum bandwidth is set to be 50M, if the task is not provided with the speed limit grade or is set to be higher than 50M, transmission is carried out according to 50M, and the speed maximum bandwidth cannot be higher than the speed maximum bandwidth, namely the speed maximum bandwidth cannot be higher than 50M.
S102, when data transmission is needed, obtaining tokens from the token bucket according to the speed limiting configuration item; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes;
in the specific application, the speed limit of the token bucket is realized by utilizing redis+Lua (database+script file), as shown in fig. 2, water drops in the graph represent request tokens, which are generated at a fixed speed, and each transmission request needs to take one token from the token bucket; token bucket algorithms are well understood that over time, the system will add tokens to the bucket at constant 1/QPS intervals (default interval of 2 s) (e.g., water is continually being added by a faucet) and will not be added if the bucket is full. The new requests are made temporarily, each taking a token, blocking or denying service if no token is available.
Another benefit of token buckets is the speed at which they can be easily changed. Once the rate needs to be increased, the rate of tokens placed in the bucket is increased as needed. A number of tokens is typically added to the bucket at regular time (e.g., 100 ms), and some variant algorithms calculate the number of tokens that should be added in real time.
S103, when enough tokens are acquired, data transmission is started.
When enough tokens are acquired, namely the number of bytes of data transmission is satisfied, the data transmission is started, so that each task can be limited to contend for transmission, and transmission blockage is caused.
The working principle of the data transmission speed limiting method between the thermomagnetic storage and the blue light storage is as follows: firstly, determining a task grade of a tenant, and setting a speed limiting configuration item according to the task grade; the speed limiting configuration item is used for limiting the bandwidth speed; when data transmission is needed, obtaining tokens from the token bucket according to the speed limiting configuration items; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes; when enough tokens are acquired, that is, the object being rate-limited needs to rob enough tokens to begin data transmission.
In some embodiments, the obtaining tokens from the token bucket according to the speed limit configuration item includes:
determining task levels, the task levels including high, medium and low levels;
taking tokens from the token bucket according to the sequence of the high level, the medium level and the low level, waiting for the corresponding waiting time set by the corresponding task level after each token taking, and taking the tokens from the token bucket again; wherein the number of tokens taken each time is 1% of the bandwidth speed.
Preferably, the waiting time corresponding to the task level includes:
the waiting time corresponding to the high level is smaller than the waiting time corresponding to the medium level, and the waiting time corresponding to the medium level is smaller than the waiting time corresponding to the low level.
It can be understood that the task class is classified into a high class, a medium class and a low class, and the task class can be set according to actual conditions, which is not limited herein; at the beginning, the high-level, the medium-level and the low-level can simultaneously start to take tokens, or can be set to start to take tokens in the token bucket in the order of the high-level, the medium-level and the low-level, but after each level takes the tokens once, the tokens can be taken from the token bucket again after waiting for the waiting time corresponding to the level, and in this way, speed limitation is performed again.
Preferably, the latency for the higher stage is 0.01 seconds, the latency for the middle stage is 0.05 seconds, and the latency for the lower stage is 0.1 seconds. It is understood that the time corresponding to each task level in the present application may also be set to other times, which is not limited herein.
Specifically, as shown in fig. 3, the speed limit of data transmission between the thermomagnetic storage and the blue light storage is achieved by setting delay for task level and corresponding waiting time through token bucket speed limit, when all files are uploaded, the tokens are taken to dis at first, a specified number of tokens are taken, the files are uploaded, and in fact, execution threads are blocked through calculation speed, so that the aim of speed limit is achieved.
In some embodiments, adding a new token is stopped when the token bucket is full and no further tokens can be placed;
when the token bucket is empty and cannot take tokens, service is denied.
Specifically, if the token bucket is full, no more tokens are required to be taken away each time a request is made, and if no tokens are available in the token bucket, service is blocked or denied.
Preferably, the token bucket puts in the token quantity corresponding to the bandwidth speed at a preset time.
Specifically, a certain number of tokens is added to the bucket at regular time (for example, 100 ms), and the number of tokens to be added can be calculated in real time.
As a specific implementation mode, the technical scheme provided by the application has a speed limiting configuration item with the maximum bandwidth in terms of speed limiting, the speed limiting configuration item cannot be lower than 50M, and if the project speed limiting is lower than 50M or is not configured, the speed limiting is carried out according to the configuration item with the maximum bandwidth. The speed limit of a token bucket is realized by using redis+Lua (database+script file), each token represents data which is allowed to transmit 1Kb, a limited object needs to rob enough tokens to upload, the number of tokens with corresponding bandwidth speed is put into the token bucket every second, all concurrent tasks go into the bucket to rob the tokens, the priority of task speed limit is high, medium and low, and the waiting time is 0.01s, 0.05s and 0.1s in sequence after the tokens are taken once from the bucket. In addition to the token bucket blocking program, the transmission process is blocked according to the task level to realize speed limit, the tokens in the bucket can be divided into 100 parts per second, and 100 times of tokens are taken from the bucket at most per second, so that the database is prevented from being frequently modified, the number of the tokens taken each time is 1% of the bandwidth speed, and the transmission is started until enough tokens are taken to finish speed limit.
The method and the device for limiting the current by using the redis can solve the concurrency problem caused by multiple instances in a distributed environment. Because the timers and counters set by redis are globally unique, the same timers and counters are used by whatever number of nodes, so that very accurate flow control can be achieved.
As shown in fig. 3, the present application provides a data transmission speed limiting device between thermomagnetic storage and blue light storage, including:
a determining module 401, configured to determine a tenant level and a task level, and set a speed limit configuration item according to the tenant level and the task level; the speed limiting configuration item is used for limiting the bandwidth speed;
an obtaining module 402, configured to obtain a token from the token bucket according to the speed limit configuration item when data transmission is required; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes;
a transmission module 403, configured to start data transmission when enough tokens are acquired.
The working principle of the data transmission speed limiting device between the thermomagnetic storage and the blue light storage provided by the application is that a determining module 401 determines a tenant level and a task level, and a speed limiting configuration item is set according to the tenant level and the task level; the speed limiting configuration item is used for limiting the bandwidth speed; the obtaining module 402 obtains tokens from the token bucket according to the speed limit configuration item when data transmission is needed; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes; the transmission module 403 starts data transmission when enough tokens are acquired.
In some embodiments, the acquiring module includes:
a determining unit configured to determine task levels including a high level, a medium level, and a low level;
the token taking unit is used for taking tokens from the token bucket according to the sequence of the high level, the medium level and the low level, waiting for the corresponding waiting time set by the corresponding task level after each token taking, and taking the tokens from the token bucket again; wherein the number of tokens taken each time is 1% of the bandwidth speed.
In some embodiments, the latency corresponding to the high level is less than the latency corresponding to the medium level, and the latency corresponding to the medium level is less than the latency corresponding to the low level.
The embodiment of the application provides a computer device, a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor is enabled to execute task grades of determined tenants, and speed limit configuration items are set according to the task grades; the speed limiting configuration item is used for limiting the bandwidth speed; when data transmission is needed, obtaining tokens from the token bucket according to the speed limiting configuration items; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes; when enough tokens are acquired, data transmission is started.
The embodiment of the application provides a computer storage medium, which stores a computer program, wherein when the computer program is executed by a processor, the processor is enabled to execute task grades of determined tenants, and speed limit configuration items are set according to the task grades; the speed limiting configuration item is used for limiting the bandwidth speed; when data transmission is needed, obtaining tokens from the token bucket according to the speed limiting configuration items; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes; when enough tokens are acquired, data transmission is started.
In summary, the invention provides a method and a device for limiting speed of data transmission between thermomagnetic storage and blue light storage, wherein the method comprises the steps of determining task grades of tenants and setting speed limiting configuration items according to the task grades; the speed limiting configuration item is used for limiting the bandwidth speed; when data transmission is needed, obtaining tokens from a token bucket according to the speed limit configuration items; wherein the token bucket is filled with a preset number of tokens at preset time intervals, and each token represents data allowing transmission of a preset number of bytes; when enough tokens are acquired, data transmission is started. The invention aims to solve the problem of speed limitation of tenant level and task level, when a user transmits an object, the object is transmitted according to the speed limitation value acquired by the tenant, the transmission speed does not exceed the speed limitation value, the tenant can configure the weight of the archiving task when creating the archiving task, three weight options of high, medium and low are provided for the user at present, the task with high weight is transmitted at a higher speed.
It can be understood that the above-provided method embodiments correspond to the above-described apparatus embodiments, and corresponding specific details may be referred to each other and will not be described herein.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. A data transmission rate limiting method between thermomagnetic storage and blue light storage, comprising:
determining a task grade of a tenant, and setting a speed limiting configuration item according to the task grade; the speed limiting configuration item is used for limiting the bandwidth speed;
when data transmission is needed, obtaining tokens from a token bucket according to the speed limiting configuration items; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes;
when enough tokens are acquired, starting data transmission;
the step of obtaining tokens from the token bucket according to the speed limit configuration item comprises the following steps:
determining task levels, the task levels including high, medium and low levels;
taking tokens from the token bucket according to the sequence of the high level, the medium level and the low level, waiting for the corresponding waiting time set by the corresponding task level after each token taking, and taking the tokens from the token bucket again; wherein the number of tokens taken each time is 1% of the bandwidth speed;
stopping adding new tokens when the token bucket is full and can not continue to put tokens;
rejecting service when the token bucket is empty and cannot take tokens;
the waiting time corresponding to the task level comprises the following steps:
the waiting time corresponding to the high level is smaller than the waiting time corresponding to the medium level, and the waiting time corresponding to the medium level is smaller than the waiting time corresponding to the low level;
the latency for the higher stage was 0.01 seconds, the latency for the middle stage was 0.05 seconds, and the latency for the lower stage was 0.1 seconds.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the token bucket puts in the token quantity corresponding to the bandwidth speed in preset time.
3. The method of claim 1, wherein the step of determining the position of the substrate comprises,
and the bandwidth of the speed limiting configuration item is greater than or equal to 50M.
4. A data transmission rate limiting device between a thermo-magnetic storage and a blue light storage, comprising:
the determining module is used for determining the tenant level and the task level and setting a speed limit configuration item according to the tenant level and the task level; the speed limiting configuration item is used for limiting the bandwidth speed;
the acquisition module is used for acquiring tokens from the token bucket according to the speed limiting configuration items when data transmission is needed; wherein the token bucket fills a preset number of tokens at preset time intervals, each token representing data allowing transmission of a preset number of bytes;
the step of obtaining tokens from the token bucket according to the speed limit configuration item comprises the following steps:
determining task levels, the task levels including high, medium and low levels;
taking tokens from the token bucket according to the sequence of the high level, the medium level and the low level, waiting for the corresponding waiting time set by the corresponding task level after each token taking, and taking the tokens from the token bucket again; wherein the number of tokens taken each time is 1% of the bandwidth speed;
stopping adding new tokens when the token bucket is full and can not continue to put tokens;
rejecting service when the token bucket is empty and cannot take tokens;
the waiting time corresponding to the task level comprises the following steps:
the waiting time corresponding to the high level is smaller than the waiting time corresponding to the medium level, and the waiting time corresponding to the medium level is smaller than the waiting time corresponding to the low level;
the latency time for the higher stage is 0.01 seconds, the latency time for the middle stage is 0.05 seconds, and the latency time for the lower stage is 0.1 seconds;
and the transmission module is used for starting data transmission when enough tokens are acquired.
5. A computer device, comprising: a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the data transmission rate limiting method between thermomagnetic storage and blue light storage as claimed in any one of claims 1 to 3.
6. A computer storage medium, characterized in that a computer program is stored, which computer program, when being executed by a processor, causes the processor to perform a data transmission speed limiting method between a thermo-magnetic storage and a blue light storage as claimed in any one of claims 1 to 3.
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| US4609920A (en) * | 1982-05-18 | 1986-09-02 | U.S. Philips Corporation | Method of and device for allocating a token to stations of a communication network having at least two logic loops for the circulation of the token, each loop having an assigned priority |
| CN101064672A (en) * | 2006-04-24 | 2007-10-31 | 华为技术有限公司 | Access equipment and its bandwidth control means |
| KR20090004166A (en) * | 2007-07-06 | 2009-01-12 | 삼성전자주식회사 | Apparatus and method for limiting packet transmission rate in a communication system |
| US9639397B1 (en) * | 2015-03-31 | 2017-05-02 | Amazon Technologies, Inc. | Dynamic burst throttling for multi-tenant storage |
| WO2019120217A1 (en) * | 2017-12-19 | 2019-06-27 | 北京金山云网络技术有限公司 | Token obtaining method and apparatus, server, user terminal, and medium |
| CN110545246A (en) * | 2018-05-29 | 2019-12-06 | 北京京东尚科信息技术有限公司 | Token bucket-based current limiting method and device |
| CN108804043A (en) * | 2018-06-26 | 2018-11-13 | 郑州云海信息技术有限公司 | Distributed block storage system bandwidth traffic control method, device, equipment and medium |
| WO2020151324A1 (en) * | 2019-01-23 | 2020-07-30 | 平安科技（深圳）有限公司 | Virtual private cloud traffic control method and related apparatus |
| CN113742114A (en) * | 2020-09-28 | 2021-12-03 | 北京沃东天骏信息技术有限公司 | System current limiting method and device |
| CN112714075A (en) * | 2020-12-30 | 2021-04-27 | 深圳市吉祥腾达科技有限公司 | Method for limiting speed of data packet forwarding by bridge |
| CN113726682A (en) * | 2021-08-30 | 2021-11-30 | 北京天空卫士网络安全技术有限公司 | Data transmission method and device based on speed limit strategy |
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