TCP very slow

ryan_pearson — Thu, 18 Nov 2021 17:52:59 GMT

I had converted the lwip_udpecho example into a project that could receive packets and send back responses on the FRDMK66F dev board.

I then did the same thing with lwip_tcpecho example. The TCP is many magnitudes slower than the UDP project. Something that the UDP project does under 1 second would take the TCP project over 10 seconds. I'm using winsock2 send and recv functions.

I expected TCP to be slower, but not to this degree. Has anyone seen this issue and have a solution to make TCP run at a more reasonable speed?

Re: TCP very slow

danielchen — Mon, 22 Nov 2021 08:55:50 GMT

Hi @ryan_pearson :

If you expect TCP to be slow, please set TCP WND as low as possible.

Regards

Daniel

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TCP very slow

Re: TCP very slow