Messages in this thread | | | From | "Ma, Chinang" <> | Date | Wed, 10 Sep 2008 09:14:27 -0700 | Subject | RE: 2.6.27-rc5 OLTP performance regression |
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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.
Thanks, Chinang -----Original Message----- From: Ingo Molnar [mailto:mingo@elte.hu] Sent: Wednesday, September 10, 2008 5:26 AM To: Ma, Chinang Cc: Peter Zijlstra; Srivatsa Vaddagiri; Mike Galbraith; Gregory Haskins; Steven Rostedt; Nick Piggin; Siddha, Suresh B; Wilcox, Matthew R; Tripathi, Sharad C; Chilukuri, Harita; linux-kernel@vger.kernel.org Subject: Re: 2.6.27-rc5 OLTP performance regression
* Ma, Chinang <chinang.ma@intel.com> wrote:
> Peter, > We increased sched_shares_ratelimit and were able to recover > the 2% performance regression. [...]
great. Could you please post a patch for that?
Ingo
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