From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753938AbXGaGbY (ORCPT ); Tue, 31 Jul 2007 02:31:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751342AbXGaGbR (ORCPT ); Tue, 31 Jul 2007 02:31:17 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:41764 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751216AbXGaGbQ (ORCPT ); Tue, 31 Jul 2007 02:31:16 -0400 Subject: Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1) From: Peter Zijlstra To: Kasper Sandberg Cc: Ingo Molnar , Linus Torvalds , Linux Kernel Mailing List , ck@vds.kolivas.org In-Reply-To: <1185839164.27166.7.camel@localhost> References: <1185536610.502.8.camel@localhost> <20070729170641.GA26220@elte.hu> <1185839164.27166.7.camel@localhost> Content-Type: text/plain Date: Tue, 31 Jul 2007 08:31:01 +0200 Message-Id: <1185863461.3092.4.camel@twins> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2007-07-31 at 01:46 +0200, Kasper Sandberg wrote: > could perhaps be filesystem related, i have my maildir(extremely large) > on reiserfs, and /home on xfs. what my mail client will do is download > mail, spamasassin it(loading database from home), then it will put to > imap server placing it on reiserfs, and then a "local" copy in my home. Ooh, do you perchance have PREEMPT_BKL=y? If so, try on another filesystem than reiserfs (or disable PREEMPT_BKL, but that is obviously the lesser of the two choices). Ingo traced a 1+ second latency at my end to BKL priority inversion between tty and reiserfs.