Re: Switch pfil(9) to rmlocks


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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