On Fri, 23 Nov 2007, Max Laier wrote:
attached is a diff to switch the pfil(9) subsystem to rmlocks, which are
more suited for the task. I'd like some exposure before doing the switch,
but I don't expect any fallout. This email is going through the patched
pfil already - twice.
Max,
Have you done performance measurements that show rmlocks to be a win in this
scenario? I did some patchs for UNIX domain sockets to replace the rwlock
there but it appeared not to have a measurable impact on SQL benchmarks,
presumbaly because the read/write blend wasn't right and/or that wasnt a
significant source of overhead in the benchmark. I'd anticipate a much more
measurable improvement for pfil, but would be interested in learning how much
is seen?
Robert N M Watson
Computer Laboratory
University of Cambridge
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