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Message-Id: <1256739779.7503.59.camel@marge.simson.net> Date: Wed, 28 Oct 2009 15:22:59 +0100 From: Mike Galbraith <efault@....de> To: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu> Subject: Re: hackbench regression with kernel 2.6.32-rc1 On Wed, 2009-10-28 at 17:29 +0800, Zhang, Yanmin wrote: > -Mike > I'm investigating 5% tbench regression on Nehalem machine. perf_counter shows > select_task_rq_fair consumes about 5% cpu time with 2.6.32-rc1 while it consumes > less than 0.5% with 2.6.31. > > Patch c88d5910890 has comments to explain it, but I still can't understand why > to add complicated balance logic when selecting task rq. > > I will check which section in function select_task_rq_fair consumes so much time. Turn off SD_WAKE_BALANCE as it was called in rc1. See commit 182a85f. -Mike -- 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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