Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756137AbYLaJuM (ORCPT ); Wed, 31 Dec 2008 04:50:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753281AbYLaJt7 (ORCPT ); Wed, 31 Dec 2008 04:49:59 -0500 Received: from mx02.mailboxcop.com ([206.125.223.72]:53087 "EHLO mx02.mailboxcop.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752957AbYLaJt7 (ORCPT ); Wed, 31 Dec 2008 04:49:59 -0500 Message-ID: <495B40C1.4080305@jaysonking.com> Date: Wed, 31 Dec 2008 03:52:01 -0600 From: Jayson King User-Agent: Thunderbird 2.0.0.18 (X11/20081119) MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: mingo@elte.hu, torvalds@linux-foundation.org, a.p.zijlstra@chello.nl, shaggy@linux.vnet.ibm.com, rjw@sisk.pl, fabio.comolli@gmail.com Subject: Disregard: was Re: large intermittent latency spike 2.6.28 (and 2.6.27.10), bisect commit ca7e716c7833aeaeb8fedd6d004c5f5d5e14d325 -> Revert "sched_clock: prevent scd->clock from moving backwards" References: <495A96FF.1000200@jaysonking.com> In-Reply-To: <495A96FF.1000200@jaysonking.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Canit-CHI2: 0.50 X-Bayes-Prob: 0.9999 (Score 4, tokens from: @@RPTN, outgoing) X-Spam-Score: 4.10 (****) [Hold at 5.20] RDNS_NONE,2(1.2),6947(-1.2),Bayes(0.9999,4.0) X-CanItPRO-Stream: outgoing (inherits from default) X-Canit-Stats-ID: 333250006 - a7a05fccb0eb X-Antispam-Training-Forget: http://mailboxcop.com/canit/b.php?i=333250006&m=a7a05fccb0eb&c=f X-Antispam-Training-Nonspam: http://mailboxcop.com/canit/b.php?i=333250006&m=a7a05fccb0eb&c=n X-Antispam-Training-Spam: http://mailboxcop.com/canit/b.php?i=333250006&m=a7a05fccb0eb&c=s Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1127 Lines: 22 > I noticed large latency spikes in 2.6.28 (and 2.6.27.10) which would > make the system unresponsive for minutes at a time (alt+Fn switching > wouldn't even work) when the system is under load. I could trigger the > latency by running a large make -j 3. Sometimes it would trigger in a > few seconds other times it would take a few minutes. > > I bisected it in 2.6.27.10 to d9a888b061f55534016d2d86a21639948312a117 > -> Revert "sched_clock: prevent scd->clock from moving backwards" > (ca7e716c7833aeaeb8fedd6d004c5f5d5e14d325 in 2.6.28) and reverting it > in 2.6.28 make the latency spike go away. At least, so far no spike in > over 24 hours. Please disregard this. I just had a latency spike again, so this is not the change I'm looking for... I'll need to look for what is causing it again, apparently not only the make -j 3 I thought, and do another test. Jayson -- 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/