Messages in this thread | | | From | Damien Wyart <> | Subject | Re: High CPU load when machine is idle (related to PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later) | Date | Tue, 30 Nov 2010 17:49:49 +0100 |
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* Peter Zijlstra <peterz@infradead.org> [101129 12:38]: > > Doesn't give wrong numbers like initial bug and tentative patches, but > > feels a bit too slow when numbers go up and down. Correct values are > > reached when waiting long enough, but it feels slow.
> > As I've tested many combinations, maybe this is an impression because > > I do not remember about "normal" delays for the load to rise and fall, > > but this still feels slow.
> You can test this by either booting with nohz=off, or builting with > CONFIG_NO_HZ=n and then comparing the result, something like
> make O=defconfig clean; while sleep 10; do uptime >> load.log; done & > make -j32 O=defconfig; kill %1
> And comparing the curves between the NO_HZ and !NO_HZ kernels.
In fact, timings were very similar between the two configurations, so I guess my feelings were wrong... They were also similar with the next version of the patch.
-- Damien Wyart
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