A device for testing the maximum delay of AVB network traffic based on the CBS flow control mechanism
A technology for network traffic and maximum delay, applied in data exchange networks, digital transmission systems, electrical components, etc., can solve problems such as deviations and cannot reflect network real-time performance, and achieve intuitive visualization of results, excellent multi-priority types of network traffic Effects of processing performance
Active Publication Date: 2019-08-20
BEIHANG UNIV
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Problems solved by technology
Using theoretical analysis methods as a compactness evaluation method for network delays has a large deviation, so the evaluation results need to be further optimized; however, the probability of the maximum delay in the actual network environment is very small, and the statistical average delay results cannot reflect all of the network. real-time performance
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Embodiment 1
[0111] Figure 4 It is the graph of the change law of the credit amount in the worst case of the AVB network in this implementation case. Set the network link transmission bandwidth R to 100Mbps, the idle rate of SR_A traffic is 50Mbps, the idle rate of SR_B traffic is 25Mbps, and BE traffic occupies the remaining 25Mpbs of network bandwidth; set the length of SR_A data frame, SR_B data frame and BE data frame (Unit byte) 189B, 1071B and 1512B respectively; The counting period T of the data source class flow generation module 10 is set 0 1ms, at T C In the operation counting period of 1s, the SR_A flow, SR_B flow and BE flow through the AVB network node are recorded with the start time stamp of entering the AVB network node and the end time stamp of leaving the network node; the monitor 70 captures and receives the SR_A data frame , SR_B data frame and BE data frame (such as figure 2 shown), and calculate the delay value of the data frame in the worst case of the network a...
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The invention discloses a device for testing the maximum delay of AVB network flow based on a CBS flow control mechanism. The device comprises a data source type flow generation module (10), a networkreceiving module (20), a CBS flow control module (30), an FIFO module (40), a network sending module (50), a timer module (60) and a monitor (70). The device disclosed by the invention runs on an FPGA processor; the maximum delay measurement technical problem in the AVB network can be solved through the CBS flow control mechanism; the device disclosed by the invention supports transmission on multi-priority type network flows; furthermore, the multi-priority type network flows in a worst scene are generated by utilization of a data source; sending of the multi-priority type network flows is controlled by adoption of the CBS flow control mechanism; and the maximum delay of the multi-priority type network flows while passing through a network node is recorded by adoption of hardware timestamps.
Description
technical field [0001] The invention belongs to the field of network testing, and more particularly relates to a device for testing the maximum delay of AVB network traffic based on a CBS flow control mechanism. Background technique [0002] The audio / video bridging (Audio / Video Bridging, AVB) network is based on the industrial standard Ethernet after the applicability transformation, using the scheduled stream (Stream Reservation, SR) and credit based shaping (Credit Based Shaping, CBS) and other mechanisms to ensure low latency Audio and video streaming services, AVB interconnection technology has been practically applied in embedded vehicle networks (such as BMW series models). The standard AVB network includes time-sensitive scheduled audio and video streams (SR_A stream and SR_B stream) and a class of Best Effort (BE). The SR_A stream is a time-sensitive audio stream, the SR_B stream is a time-sensitive video stream, and the BE stream is a best-effort stream. [0003]...
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IPC IPC(8): H04L12/26
Inventor 何锋李二帅赵琳熊华钢
Owner BEIHANG UNIV