[GitHub] [incubator-nuttx] a-lunev commented on pull request #5226: sim/netdev: eliminated RX data stream congestion in case of high TX network traffic

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a-lunev commented on pull request #5226:
URL: https://github.com/apache/incubator-nuttx/pull/5226#issuecomment-1012956135


   > @a-lunev what's the perf number before change?
   
   Actually, this throughput increase is due to https://github.com/apache/incubator-nuttx-apps/pull/952 enhancement in netcat. This PR #5226 just fixes the bug (hang-up) at high traffic. In https://github.com/apache/incubator-nuttx-apps/pull/952 I wrote that before enabling sendfile for netcat the TCP throughput was only 205 Kbit/s (not depending on the transmitted file size). After I enabled sendfile in netcat, the TCP throughput was up to 8.19 Mbit/s (the transmitted file was 1000 KB). However, if I tried to send larger file (10 MB), the TCP connection hung up.
   Thus PR #5226 fixes the issue with TCP connection hang-up because of RX stream congestion. After that I was able to test the performance using a larger file (10 MB). If the file size is 10 MB or larger, TCP throughput on Linux host (my setup) achieves now 234 Mbits/sec.


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