Re: [RFC][PATCH 00/18] sched: Reduce runqueue lock contention -v4
From: Ingo Molnar
Date: Tue Jan 04 2011 - 10:17:17 EST
* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> Latest version of the scary patches...
Just to make it easier for others to see the rationale behind this series, see the
numbers and limitations listed below.
As measured using: http://oss.oracle.com/~mason/sembench.c
$ echo 4096 32000 64 128 > /proc/sys/kernel/sem
$ ./sembench -t 2048 -w 1900 -o 0
unpatched: run time 30 seconds 639476 worker burns per second
patched: run time 30 seconds 847526 worker burns per second
Still need to sort out all the races marked XXX (non-trivial), and its
x86 only for the moment.
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