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The TCP server implementation in dbgport does not track clients, so it may try to write to a disconected socket resulting in SIGPIPE. Avoid that by setting SO_NOSIGPIPE socket option. Because dbgport emulates an I/O port to guest, the communication is done byte by byte. Reduce latency of the TCP/IP transfers by using TCP_NODELAY option. In my tests that change improves performance of kgdb commands with lots of output (e.g. info threads) by two orders of magnitude. A general note. Since we have a uart emulation in bhyve, that can be used for the console and gdb access to guests. So, bvmconsole and bvmdebug could be de-orbited now. But there are many existing deployments that still dependend on those. Discussed with: julian, jhb MFC after: 2 weeks Sponsored by: Panzura
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