Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756151AbYHTVXg (ORCPT ); Wed, 20 Aug 2008 17:23:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753629AbYHTVX0 (ORCPT ); Wed, 20 Aug 2008 17:23:26 -0400 Received: from emh05.mail.saunalahti.fi ([62.142.5.111]:55096 "EHLO emh05.mail.saunalahti.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753581AbYHTVXZ (ORCPT ); Wed, 20 Aug 2008 17:23:25 -0400 Date: Thu, 21 Aug 2008 00:25:55 +0300 (MET DST) From: Szabolcs Szakacsits X-X-Sender: szaka@dhcppc2 To: Ryusuke Konishi cc: Andrew Morton , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH RFC] nilfs2: continuous snapshotting file system In-Reply-To: <200808201613.AA00212@capsicum.lab.ntt.co.jp> Message-ID: References: <20080820004326.519405a2.akpm@linux-foundation.org> <200808201613.AA00212@capsicum.lab.ntt.co.jp> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Antivirus: VAMS Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1590 Lines: 45 On Thu, 21 Aug 2008, Ryusuke Konishi wrote: > >> Some impressive benchmark results on SSD are shown in [3], > > > >heh. It wipes the floor with everything, including btrfs. It seems the benchmark was done over half year ago. It's questionable how relevant today the performance comparison is with actively developed file systems ... > >But a log-based fs will do that, initially. What will the performace > >look like after a month or two's usage? > > I'm using NILFS2 for my home directory for serveral months, but so far > I don't feel notable performance degradation. I ran compilebench on kernel 2.6.26 with freshly formatted volumes. The behavior of NILFS2 was interesting. Its peformance rapidly degrades to the lowest ever measured level (< 1 MB/s) but after a while it recovers and gives consistent numbers. However it's still very far from the current unstable btrfs performance. The results are reproducible. MB/s Runtime (s) ----- ----------- btrfs unstable 17.09 572 ext3 13.24 877 btrfs 0.16 12.33 793 nilfs2 2nd+ runs 11.29 674 ntfs-3g 8.55 865 reiserfs 8.38 966 nilfs2 1st run 4.95 3800 xfs 1.88 3901 Szaka -- NTFS-3G: http://ntfs-3g.org -- 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/