Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752753Ab0DKSmf (ORCPT ); Sun, 11 Apr 2010 14:42:35 -0400 Received: from one.firstfloor.org ([213.235.205.2]:34578 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752387Ab0DKSmd (ORCPT ); Sun, 11 Apr 2010 14:42:33 -0400 Date: Sun, 11 Apr 2010 20:42:27 +0200 From: Andi Kleen To: Thomas Gleixner Cc: Avi Kivity , Ben Gamari , Andi Kleen , Arjan van de Ven , LKML , tytso@mit.edu, npiggin@suse.de, Ingo Molnar , Ruald Andreae , Jens Axboe , Olly Betts , martin f krafft Subject: Re: Poor interactive performance with I/O loads with fsync()ing Message-ID: <20100411184227.GL18855@one.firstfloor.org> References: <4b9fa440.12135e0a.7fc8.ffffe745@mx.google.com> <4baeaee5.c5c2f10a.7187.2688@mx.google.com> <20100327204233.0d84542a@infradead.org> <4baf624c.48c3f10a.16d0.ffffccb8@mx.google.com> <87y6hcyu85.fsf@basil.nowhere.org> <4bbf401e.a3b9e70a.13f3.4460@mx.google.com> <4BC1E4A4.1070103@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.2i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 863 Lines: 22 > XFS does not do much better. Just moved my VM images back to ext for > that reason. Did you move from XFS to ext3? ext3 defaults to barriers off, XFS on, which can make a big difference depending on the disk. You can disable them on XFS too of course, with the known drawbacks. XFS also typically needs some tuning to get reasonable log sizes. My point was merely (before people chime in with counter examples) that XFS/btrfs/jfs don't suffer from the "need to sync all transactions for every fsync" issue. There can (and will be) still other issues. -Andi -- ak@linux.intel.com -- Speaking for myself only. -- 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/