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Date: Tue, 16 Feb 2016 09:51:11 +0100 From: Peter Zijlstra <peterz@...radead.org> To: Waiman Long <Waiman.Long@....com> Cc: Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Ding Tianhong <dingtianhong@...wei.com>, Jason Low <jason.low2@....com>, Davidlohr Bueso <dave@...olabs.net>, "Paul E. McKenney" <paulmck@...ibm.com>, Thomas Gleixner <tglx@...utronix.de>, Will Deacon <Will.Deacon@....com>, Tim Chen <tim.c.chen@...ux.intel.com> Subject: Re: [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter On Fri, Feb 12, 2016 at 12:32:11PM -0500, Waiman Long wrote: > My own test on a 4-socket E7-4820 v3 system showed a regression of > about 4% in the high_systime workload with Peter's patch which this > new patch effectively eliminates. > > Testing on an 8-socket Westmere-EX server, however, has performance > change from -9% to than +140% on the fserver workload of AIM7 > depending on how the system was set up. Subject: [lkp] [locking/mutex] aaca135480: -72.9% fsmark.files_per_sec My patch also generated the above email. Please also test that benchmark against this approach.
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