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RE: 2.6.27-rc5 OLTP performance regression

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From: Ma, Chinang <chinang.ma@...>
To: Ingo Molnar <mingo@...>
Cc: Peter Zijlstra <peterz@...>, Srivatsa Vaddagiri <vatsa@...>, Mike Galbraith <efault@...>, Gregory Haskins <ghaskins@...>, Steven Rostedt <rostedt@...>, Nick Piggin <nickpiggin@...>, Siddha, Suresh B <suresh.b.siddha@...>, Wilcox, Matthew R <matthew.r.wilcox@...>, Tripathi, Sharad C <sharad.c.tripathi@...>, Chilukuri, Harita <harita.chilukuri@...>, linux-kernel@vger.kernel.org <linux-kernel@...>
Subject: RE: 2.6.27-rc5 OLTP performance regression
Date: Wednesday, September 10, 2008 - 12:14 pm

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:


great. Could you please post a patch for that?

        Ingo
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Messages in current thread:
Re: 2.6.27-rc5 OLTP performance regression, Peter Zijlstra, (Mon Sep 8, 2:00 pm)
Re: 2.6.27-rc5 OLTP performance regression, Peter Zijlstra, (Mon Sep 8, 2:04 pm)
RE: 2.6.27-rc5 OLTP performance regression, Ma, Chinang, (Tue Sep 9, 5:39 pm)
Re: 2.6.27-rc5 OLTP performance regression, Ingo Molnar, (Wed Sep 10, 8:26 am)
RE: 2.6.27-rc5 OLTP performance regression, Ma, Chinang, (Wed Sep 10, 12:14 pm)
Re: 2.6.27-rc5 OLTP performance regression, Ingo Molnar, (Wed Sep 10, 1:34 pm)
RE: 2.6.27-rc5 OLTP performance regression, Ma, Chinang, (Wed Sep 10, 8:07 pm)