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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2022/01/02 04:48:51 UTC

[GitHub] [incubator-nuttx] a-lunev opened a new pull request #5137: net/tcp(unbuffered): fast retransmit on duplicate acknowledgments

a-lunev opened a new pull request #5137:
URL: https://github.com/apache/incubator-nuttx/pull/5137


   ## Summary
   
   Fast retransmit on duplicate acknowledgments (RFC 5681).
   This PR is like PR #2414, but for unbuffered mode.
   
   ## Impact
   
   TCP
   
   ## Testing
   
   Activate emulating packet loss on Linux host:
   `$ sudo iptables -A INPUT -p tcp --dport 5471 -m statistic --mode random --probability 0.01 -j DROP`
   
   Build NuttX:
   ```
   $ ./tools/configure.sh -l sim:tcpblaster
   $ make menuconfig (disable CONFIG_NET_TCP_WRITE_BUFFERS, enable CONFIG_NETUTILS_IPERF, set CONFIG_NETUTILS_IPERFTEST_DEVNAME=eth0)
   $ make
   ```
   Enable TUN/TAP on Linux host:
   ```
   $ sudo setcap cap_net_admin+ep ./nuttx
   $ sudo ./tools/simhostroute.sh wlan0 on
   ```
   Start iperf on Linux host:
   `$ iperf -s -p 5471 -i 1 -w 416K`
   
   Run NuttX on Linux host:
   ```
   $ ./nuttx
   NuttShell (NSH) NuttX-10.2.0
   nsh> ifconfig eth0 10.0.1.2
   nsh> ifup eth0
   ifup eth0...OK
   ```
   Start Wireshark (or tcpdump) and capture appeared tap0 interface.
   
   Run iperf in NuttX:
   `nsh> iperf -c 192.168.1.68 -p 5471 -i 1 -t 60`
   
   Observe packet loss -> duplicate ACKs -> Fast Retransmit in TCP dump.
   
   Shutdown NuttX:
   `nsh> poweroff`
   
   Disable TUN/TAP on Linux host:
   `$ sudo ./tools/simhostroute.sh wlan0 off`
   
   Deactivate emulating packet loss on Linux host:
   `$ sudo iptables -D INPUT -p tcp --dport 5471 -m statistic --mode random --probability 0.01 -j DROP`


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[GitHub] [incubator-nuttx] xiaoxiang781216 merged pull request #5137: net/tcp(unbuffered): fast retransmit on duplicate acknowledgments

Posted by GitBox <gi...@apache.org>.
xiaoxiang781216 merged pull request #5137:
URL: https://github.com/apache/incubator-nuttx/pull/5137


   


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