Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269059AbUJERPx (ORCPT ); Tue, 5 Oct 2004 13:15:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269057AbUJERPx (ORCPT ); Tue, 5 Oct 2004 13:15:53 -0400 Received: from fmr03.intel.com ([143.183.121.5]:24258 "EHLO hermes.sc.intel.com") by vger.kernel.org with ESMTP id S269059AbUJERPv (ORCPT ); Tue, 5 Oct 2004 13:15:51 -0400 Message-Id: <200410051715.i95HFh627747@unix-os.sc.intel.com> From: "Chen, Kenneth W" To: "'Nick Piggin'" Cc: Subject: RE: bug in sched.c:task_hot() Date: Tue, 5 Oct 2004 10:15:49 -0700 X-Mailer: Microsoft Office Outlook, Build 11.0.5510 Thread-Index: AcSqifJd1E6Een1oTDWBf7POckp3BQAdHcdg In-Reply-To: <41621263.2000404@yahoo.com.au> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 866 Lines: 22 Nick Piggin wrote on Monday, October 04, 2004 8:18 PM > >This bug causes large amount of incorrect process migration across > >cpus (at stunning 10,000 per second) and we lost cache affinity very > >quickly and almost took double digit performance regression on a db > >transaction processing workload. Patch to fix the bug. Diff'ed against > >2.6.9-rc3. > > > > This one looks OK (the other may need a bit of rethinking). > What kernel is the regression in relation to, out of interest? Performance regression was initially seen on 2.6.8 relative to 2.6.6. We subsequently narrowed down to these set of bugs. - Ken - 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/