Testing needed for new pipe code (in master)
dillon at apollo.backplane.com
Sun Jul 12 22:53:11 PDT 2009
I have substantially rewritten kern/sys_pipe.c, which is our support
for pipes. It should work quite well on a SMP box now. Performance
on UP boxes might be a bit lower then the old code but the difference
should not be noticable for any production workload.
To test the SMP improvements set sysctl kern.pipe.mpsafe=1.
The latest code significantly improves synchronous communication over
a pipe (not a socket, sorry), reducing (Awrite,Bread,Bwrite,Aread)
sequences from 7uS to 2uS on my test box. The pipe1 test (from
/usr/src/test/sysperf) tests this.
The latest code is now able to fully saturated all available cpus
when running multiple copies of the pipe2 test (from
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