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From: Davidlohr Bueso <davidlohr.bueso@hp.com>
To: Alex Shi <alex.shi@intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>,
	Ingo Molnar <mingo@elte.hu>, Rik van Riel <riel@redhat.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Mel Gorman <mgorman@suse.de>, Andi Kleen <andi@firstfloor.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Michel Lespinasse <walken@google.com>,
	"Wilcox, Matthew R" <matthew.r.wilcox@intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: Performance regression from switching lock to rw-sem for anon-vma tree
Date: Mon, 17 Jun 2013 16:35:20 -0700	[thread overview]
Message-ID: <1371512120.1778.40.camel@buesod1.americas.hpqcorp.net> (raw)
In-Reply-To: <51BF99B0.4040509@intel.com>

On Tue, 2013-06-18 at 07:20 +0800, Alex Shi wrote:
> On 06/18/2013 12:22 AM, Davidlohr Bueso wrote:
> > After a lot of benchmarking, I finally got the ideal results for aim7,
> > so far: this patch + optimistic spinning with preemption disabled. Just
> > like optimistic spinning, this patch by itself makes little to no
> > difference, yet combined is where we actually outperform 3.10-rc5. In
> > addition, I noticed extra throughput when disabling preemption in
> > try_optimistic_spin().
> > 
> > With i_mmap as a rwsem and these changes I could see performance
> > benefits for alltests (+14.5%), custom (+17%), disk (+11%), high_systime
> > (+5%), shared (+15%) and short (+4%), most of them after around 500
> > users, for fewer users, it made little to no difference.
> 
> A pretty good number. what's the cpu number in your machine? :)

8-socket, 80 cores (ht off)



  reply	other threads:[~2013-06-17 23:35 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1371165333.27102.568.camel@schen9-DESK>
     [not found] ` <1371167015.1754.14.camel@buesod1.americas.hpqcorp.net>
2013-06-14 16:09   ` Performance regression from switching lock to rw-sem for anon-vma tree Tim Chen
2013-06-14 22:31     ` Davidlohr Bueso
2013-06-14 22:44       ` Tim Chen
2013-06-14 22:47       ` Michel Lespinasse
2013-06-17 22:27         ` Tim Chen
2013-06-16  9:50   ` Alex Shi
2013-06-17 16:22     ` Davidlohr Bueso
2013-06-17 18:45       ` Tim Chen
2013-06-17 19:05         ` Davidlohr Bueso
2013-06-17 22:28           ` Tim Chen
2013-06-17 23:18         ` Alex Shi
2013-06-17 23:20       ` Alex Shi
2013-06-17 23:35         ` Davidlohr Bueso [this message]
2013-06-18  0:08           ` Tim Chen
2013-06-19 23:11             ` Davidlohr Bueso
2013-06-19 23:24               ` Tim Chen
2013-06-13 23:26 Tim Chen
2013-06-19 13:16 ` Ingo Molnar
2013-06-19 16:53   ` Tim Chen
2013-06-26  0:19     ` Tim Chen
2013-06-26  9:51       ` Ingo Molnar
2013-06-26 21:36         ` Tim Chen
2013-06-27  0:25           ` Tim Chen
2013-06-27  8:36             ` Ingo Molnar
2013-06-27 20:53               ` Tim Chen
2013-06-27 23:31                 ` Tim Chen
2013-06-28  9:38                   ` Ingo Molnar
2013-06-28 21:04                     ` Tim Chen
2013-06-29  7:12                       ` Ingo Molnar
2013-07-01 20:28                         ` Tim Chen
2013-07-02  6:45                           ` Ingo Molnar
2013-07-16 17:53                             ` Tim Chen
2013-07-23  9:45                               ` Ingo Molnar
2013-07-23  9:51                                 ` Peter Zijlstra
2013-07-23  9:53                                   ` Ingo Molnar
2013-07-30  0:13                                     ` Tim Chen
2013-07-30 19:24                                       ` Ingo Molnar
2013-08-05 22:08                                         ` Tim Chen
2013-07-30 19:59                                       ` Davidlohr Bueso
2013-07-30 20:34                                         ` Tim Chen
2013-07-30 21:45                                           ` Davidlohr Bueso
2013-08-06 23:55                                       ` Davidlohr Bueso
2013-08-07  0:56                                         ` Tim Chen
2013-08-12 18:52                                           ` Ingo Molnar
2013-08-12 20:10                                             ` Tim Chen
2013-06-28  9:20                 ` Ingo Molnar

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