From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751247Ab1LPFQO (ORCPT ); Fri, 16 Dec 2011 00:16:14 -0500 Received: from mga09.intel.com ([134.134.136.24]:50919 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750898Ab1LPFQM (ORCPT ); Fri, 16 Dec 2011 00:16:12 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.67,352,1309762800"; d="scan'208";a="87166957" Date: Fri, 16 Dec 2011 13:16:09 +0800 From: Wu Fengguang To: Dave Chinner Cc: "linux-fsdevel@vger.kernel.org" , LKML , Christoph Hellwig Subject: Re: XFS/btrfs performance after IO-less dirty throttling Message-ID: <20111216051609.GA4502@localhost> References: <20111214143156.GA22511@localhost> <20111215133137.GA14562@localhost> <20111216003157.GA23662@dastard> <20111216015311.GA15996@localhost> <20111216042508.GE23662@dastard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20111216042508.GE23662@dastard> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Dec 16, 2011 at 12:25:08PM +0800, Dave Chinner wrote: > On Fri, Dec 16, 2011 at 09:53:11AM +0800, Wu Fengguang wrote: > > I'm indeed happy that you don't care that much on that regression > > introduced by me ;-) > > Heh. > > BTW, do these tests run to ENOSPC? Nope. Shall ENOSPC (performance) be tested? > > 10829.00 +4.3% 11296.00 TOTAL xfs:xfs_delalloc_enospc > > This implies that it does. Not really. The USB key partition size is 7.1GB. Even in the fastest 1dd case, only 4GB data is written: wfg@bee /export/writeback% cat fat/UKEY-thresh=100M/xfs-1dd-1-3.2.0-rc3/ls-files 131 -rw-rw-r-- 1 root root 4060078080 Dec 8 15:57 /fs/sdb3/zero-1 That's about 6.7MB/s write bandwidth running for 600 seconds. Thanks, Fengguang