About the transmission rate of TCP

Libraries
21

Can you test once by directly connecting your board to the computer running your TCP server?

22

@slhuan

Can you share the values you have configured for ipconfigNETWORK_MTU and ipconfigTCP_MSS (if defined) in the FreeRTOSIPConfig.h?

23

@slhuan

If ipconfigTCP_MSS is not defined in FreeRTOSIPConfig.h try defining it to a value less than or equal to 1400 and check.

24

ok, i will do it later

25

i defined mtu=1500, mss=1460 in FreeRTOSIPConfig.h

26

I tried to connect my board to computer directly, and get the same result.
net-1.zip (13.1 KB)

27

@slhuan

Did you try lowering ipconfigTCP_MSS in FreeRTOSIPConfig.h try defining it to a value less than or equal to 1400?

28

aha，i tried to define it to 1200, now it seems working well!!
Thanks very much!

29

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I used jperf for testing transmission rate, it can be almost 30Mbps

30

Thanks for reporting back, as documented here: MSS - FreeRTOS™
Some setups might restrict MSS to 1400 bytes for reliability; that might be the case here. Or probably your server application might be rejecting packets above 1400.

Can you share the version of FreeRTOS+TCP you are using?

31

sorry for that i forget which version i use, could you tell me how to find the version i am using?

32

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maybe it is v4.0.999?

33

You can take a look at the History.txt or manifest.yml file in the root folder of the FreeRTOS+TCP library.

34

ok. The version is v4.2.0
image

35

Thanks for sharing the version.