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Gmane
From: Peter Zijlstra <a.p.zijlstra <at> chello.nl>
Subject: [PATCH 00/21] sched: Reduce runqueue lock contention -v6
Newsgroups: gmane.linux.kernel
Date: Tuesday 5th April 2011 15:23:38 UTC (over 5 years ago)
This patch series aims to optimize remote wakeups by moving most of the
work of the wakeup to the remote cpu and avoid bouncing runqueue data
structures where possible.

As measured by sembench (which basically creates a wakeup storm) on my
dual-socket westmere:

$ for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo
performance > $i; done
$ echo 4096 32000 64 128 > /proc/sys/kernel/sem
$ ./sembench -t 2048 -w 1900 -o 0

unpatched: run time 30 seconds 647278 worker burns per second
patched:   run time 30 seconds 816715 worker burns per second

I've queued this series for .40.
 
CD: 3ms