Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754370AbYHUGEw (ORCPT ); Thu, 21 Aug 2008 02:04:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754605AbYHUGEh (ORCPT ); Thu, 21 Aug 2008 02:04:37 -0400 Received: from ipmail01.adl6.internode.on.net ([203.16.214.146]:19939 "EHLO ipmail01.adl6.internode.on.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754494AbYHUGEf (ORCPT ); Thu, 21 Aug 2008 02:04:35 -0400 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApoEAAShrEh5LD0w/2dsb2JhbAC1NIFm X-IronPort-AV: E=Sophos;i="4.32,243,1217773800"; d="scan'208";a="176211865" Date: Thu, 21 Aug 2008 16:04:18 +1000 From: Dave Chinner To: Szabolcs Szakacsits , Andrew Morton , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com Subject: Re: XFS vs Elevators (was Re: [PATCH RFC] nilfs2: continuous snapshotting file system) Message-ID: <20080821060418.GC5706@disturbed> Mail-Followup-To: Szabolcs Szakacsits , Andrew Morton , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com References: <20080820004326.519405a2.akpm@linux-foundation.org> <200808201613.AA00212@capsicum.lab.ntt.co.jp> <20080820143916.1a7eddab.akpm@linux-foundation.org> <20080821021259.GA5706@disturbed> <20080821051508.GB5706@disturbed> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080821051508.GB5706@disturbed> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1765 Lines: 41 On Thu, Aug 21, 2008 at 03:15:08PM +1000, Dave Chinner wrote: > On Thu, Aug 21, 2008 at 05:46:00AM +0300, Szabolcs Szakacsits wrote: > > On Thu, 21 Aug 2008, Dave Chinner wrote: > > Everything is default. > > > > % rpm -qf =mkfs.xfs > > xfsprogs-2.9.8-7.1 > > > > which, according to ftp://oss.sgi.com/projects/xfs/cmd_tars, is the > > latest stable mkfs.xfs. Its output is > > > > meta-data=/dev/sda8 isize=256 agcount=4, agsize=1221440 blks > > = sectsz=512 attr=2 > > data = bsize=4096 blocks=4885760, imaxpct=25 > > = sunit=0 swidth=0 blks > > naming =version 2 bsize=4096 > > log =internal log bsize=4096 blocks=2560, version=2 > > = sectsz=512 sunit=0 blks, lazy-count=0 > > realtime =none extsz=4096 blocks=0, rtextents=0 > > Ok, I thought it might be the tiny log, but it didn't improve anything > here when increased the log size, or the log buffer size. One thing I just found out - my old *laptop* is 4-5x faster than the 10krpm scsi disk behind an old cciss raid controller. I'm wondering if the long delays in dispatch is caused by an interaction with CTQ but I can't change it on the cciss raid controllers. Are you using ctq/ncq on your machine? If so, can you reduce the depth to something less than 4 and see what difference that makes? Cheers, Dave. -- Dave Chinner david@fromorbit.com -- 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/