Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754520AbXEEW3k (ORCPT ); Sat, 5 May 2007 18:29:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754349AbXEEW3k (ORCPT ); Sat, 5 May 2007 18:29:40 -0400 Received: from wx-out-0506.google.com ([66.249.82.232]:40384 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754520AbXEEW3k (ORCPT ); Sat, 5 May 2007 18:29:40 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:mime-version:content-type:content-transfer-encoding:content-disposition; b=LAvXCv9f2HnXaQpujWxkrAG4MtxN/9kqsq9I+ltAsa6DMybFq2epwprny9ItrDKX+M4iKVFeQmdv7mXH3X4uoBbsOPLu6zRXc0kUA9FyuW/s6JRlEmxXkffDTgpPkWYnyJ8yx3E6U/roTCI72nIgG3pBmj8iSaQ9pCIuE7Qtars= Message-ID: Date: Sun, 6 May 2007 00:29:39 +0200 From: "Leon Woestenberg" To: linux-kernel@vger.kernel.org Subject: [ext3] journal commit interval MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 975 Lines: 27 Hello all, this is something I have long wondered about but have been afraid to ask. When my system is chewing away on builds, the disk I/O write access pattern of my ext3 root filesystem (using CFQ, Intel SATA controller, hard disk) when visualized by GNOME System Monitor clearly shows a repetitive landscape of large peaks, 5 seconds apart, which not much activity inbetween. I understand that's due to the ex3 journal commit interval (defaults to 5 seconds). But why isn't the filesystem continuously committing only that part of the journal that is older than 5 seconds? I would then expect the write requests to be smoothened over time, which can only be good in terms of performance and low latency. Regards, -- Leon - 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/