Re: 2.6.27-rc5 OLTP performance regression
From: Ingo Molnar
Date: Wed Sep 10 2008 - 13:35:17 EST
* Ma, Chinang <chinang.ma@xxxxxxxxx> wrote:
> I increased the /proc/sys/kernel/sched_shares_ratelimit from 1
> millisecond to one second to reduce the frequency of shares update.
> That was okay for OLTP workload. As Peter mentioned, a larger value
> will reduce the accuracy of SMP fairness for group scheduler and the
> ratelimit and using a larger default value may not be good for general
> case.
does 10 msecs already get you most of the 2%? 1000 millisecond sounds
very (and probably unacceptable) coarse.
Ingo
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