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author | julian <julian@FreeBSD.org> | 2016-12-02 08:24:00 +0000 |
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committer | julian <julian@FreeBSD.org> | 2016-12-02 08:24:00 +0000 |
commit | 5c325f007b252a394e014fef7ff608a260222247 (patch) | |
tree | a02e87406259c28885f51f83328394438730b1bf /sys/i386 | |
parent | 0465785c41747214c1e081431fe93a9daacdc6fd (diff) | |
download | FreeBSD-src-5c325f007b252a394e014fef7ff608a260222247.zip FreeBSD-src-5c325f007b252a394e014fef7ff608a260222247.tar.gz |
MFH: r309295
bhyve: stability and performance improvement for dbgport
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
Sponsored by: Panzura
Diffstat (limited to 'sys/i386')
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