From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Galbraith Subject: Re: [PATCH V3]hrtimer: Fix a performance regression by disable reprogramming in remove_hrtimer Date: Thu, 12 Dec 2013 15:42:02 +0100 Message-ID: <1386859322.6056.83.camel@marge.simpson.net> References: <24EECBCC-F655-404F-8946-73CC36095A5F@gmail.com> <1378362989.18435.2.camel@marge.simpson.net> <20130905111428.GB23362@gmail.com> <1378386697.6567.9.camel@marge.simpson.net> <20130905133750.GA26637@gmail.com> <1378445942.5434.31.camel@marge.simpson.net> <20130909122325.GX31370@twins.programming.kicks-ass.net> <1378730538.5586.30.camel@marge.simpson.net> <20130909133044.GB31370@twins.programming.kicks-ass.net> <20130909134635.GB26785@twins.programming.kicks-ass.net> <20130911085643.GS26785@twins.programming.kicks-ass.net> <1378895123.5476.83.camel@marge.simpson.net> <1381120901.9926.11.camel@marge.simpson.net> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from moutng.kundenserver.de ([212.227.17.10]:64207 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751358Ab3LLOmN (ORCPT ); Thu, 12 Dec 2013 09:42:13 -0500 In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Ethan Zhao Cc: Peter Zijlstra , Ingo Molnar , LKML , Thomas Gleixner , rjw@sisk.pl, Daniel Lezcano , linux-pm@vger.kernel.org, Len Brown On Thu, 2013-12-12 at 22:14 +0800, Ethan Zhao wrote: > Mike, > it seems the IPI issue got root cause (cpu hardware errata ) now ? > I only catch some pieces of the mails, is that to say the crazy horse > made by Intel will wake up unexpected, and eat too much reschedule > IPI, then the horse got hotter, performance down, and so the fix would > be a 'CFLUSH' to all the buggy CPU, is that right ? You're mixing a couple different issues together, but yeah, close enough. The barking amazonian tree guppy is being saved as we speak. -Mike