Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751382AbZCIOLq (ORCPT ); Mon, 9 Mar 2009 10:11:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751223AbZCIOLg (ORCPT ); Mon, 9 Mar 2009 10:11:36 -0400 Received: from mail.gmx.net ([213.165.64.20]:40405 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751186AbZCIOLg (ORCPT ); Mon, 9 Mar 2009 10:11:36 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1962fg2g/96KapBnD9C0q9ePuij5wJkjhvkTACCj/ Tc1Xk6OaoQrEVs Subject: Re: [patch] Re: scheduler oddity [bug?] From: Mike Galbraith To: Peter Zijlstra Cc: Ingo Molnar , Balazs Scheidler , linux-kernel@vger.kernel.org, Willy Tarreau In-Reply-To: <1236607083.5980.8.camel@marge.simson.net> References: <1236448069.16726.21.camel@bzorp.balabit> <1236505323.6281.57.camel@marge.simson.net> <1236506309.6972.8.camel@marge.simson.net> <20090308153956.GB19658@elte.hu> <1236529200.7110.16.camel@marge.simson.net> <20090308175255.GA22802@elte.hu> <1236585731.6118.24.camel@marge.simson.net> <20090309080714.GB24904@elte.hu> <1236596664.8389.331.camel@laptop> <1236604563.6027.8.camel@marge.simson.net> <1236605870.6515.5.camel@marge.simson.net> <1236606389.8389.518.camel@laptop> <1236607083.5980.8.camel@marge.simson.net> Content-Type: text/plain Date: Mon, 09 Mar 2009 15:11:30 +0100 Message-Id: <1236607890.6168.7.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.49 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2996 Lines: 69 On Mon, 2009-03-09 at 14:58 +0100, Mike Galbraith wrote: > On Mon, 2009-03-09 at 14:46 +0100, Peter Zijlstra wrote: > > On Mon, 2009-03-09 at 14:37 +0100, Mike Galbraith wrote: > > > On Mon, 2009-03-09 at 14:16 +0100, Mike Galbraith wrote: > > > > On Mon, 2009-03-09 at 12:04 +0100, Peter Zijlstra wrote: > > > > > > > > > OK, talked a bit with Ingo, the reason you're doing is that avg_overlap > > > > > can easily grow stale.. I can see that happen indeed. > > > > > > > > > > So the 'perfect' thing would be a task-runtime decay, barring that the > > > > > preemption thing seems a sane enough hart-beat of a task. > > > > > > > > > > How does the below look to you? > > > > > > > > Other than the fact that the test for sync reject is currently > > > > avg_overlap > sysctl_sched_migration_cost, looks fine to me. Having it > > > > capped at the boundary is probably the better way to go. > > > > > > Heh, doesn't _quite_ work though. The little bugger now hovers just > > > under :-/ > > > > > se.avg_overlap : 0.499993 > > > > Right, update_avg()'s >>3 and the off-by-one you spotted. > > (that was with the off-by-one fixed, but..) > > > I recon stuff works better with a 2* added? After that I guess its > > praying sysbench still works.. :-) > > Yes 2* worked fine. Mysql+oltp was my worry spot, being a very affinity > sensitive little , but my patchlet didn't cause any trouble, so > this one shouldn't either. I'll do some re-test in any case, and squeak > should anything turn up. Squeak! Didn't even get to mysql+oltp. marge:..local/tmp # netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -- -P 15888,12384 -s 32768 -S 32768 -m 4096 UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 15888 AF_INET to 127.0.0.1 (127.0.0.1) port 12384 AF_INET Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec 65536 4096 60.00 5161103 0 2818.65 65536 60.00 5149666 2812.40 6188 root 20 0 1040 544 324 R 100 0.0 0:31.49 0 netperf 6189 root 20 0 1044 260 164 R 48 0.0 0:15.35 3 netserver Hurt, pain, ouch, vs... marge:..local/tmp # netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -T 0,0 -- -P 15888,12384 -s 32768 -S 32768 -m 4096 UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 15888 AF_INET to 127.0.0.1 (127.0.0.1) port 12384 AF_INET : cpu bind Socket Message Elapsed Messages Size Size Time Okay Errors Throughput bytes bytes secs # # 10^6bits/sec 65536 4096 60.00 8452028 0 4615.93 65536 60.00 8442945 4610.97 Drat. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/