[lwip-users] recv ok.. send is super slow

[Rishi Khan]

I am trying to test the performance of the lwip stack between two linux machines. If the server is lwIP, the performance is on par with the linux IP stack. If the client is lwIP, it is super slow. It seems that lwIP only sends data after a long timeout (it does not seem tied to tcp_slow/fast_tmr). Also, in the linux/linux case, the CPU utilization goes way up, but in the lwip-to-linux, the CPU says low. Is there any easy way to change this behavior? Attached is a simple example code.

rishiperf.c
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lwipopts.h

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