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Message-ID: <20080910173442.GB31942@elte.hu> Date: Wed, 10 Sep 2008 19:34:42 +0200 From: Ingo Molnar <mingo@...e.hu> To: "Ma, Chinang" <chinang.ma@...el.com> Cc: Peter Zijlstra <peterz@...radead.org>, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>, Mike Galbraith <efault@....de>, Gregory Haskins <ghaskins@...ell.com>, Steven Rostedt <rostedt@...dmis.org>, Nick Piggin <nickpiggin@...oo.com.au>, "Siddha, Suresh B" <suresh.b.siddha@...el.com>, "Wilcox, Matthew R" <matthew.r.wilcox@...el.com>, "Tripathi, Sharad C" <sharad.c.tripathi@...el.com>, "Chilukuri, Harita" <harita.chilukuri@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: 2.6.27-rc5 OLTP performance regression * Ma, Chinang <chinang.ma@...el.com> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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