From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id n5GHWGcR171381 for ; Tue, 16 Jun 2009 12:32:16 -0500 Received: from mail.sandeen.net (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id CC9D82FD521 for ; Tue, 16 Jun 2009 10:32:40 -0700 (PDT) Received: from mail.sandeen.net (sandeen.net [209.173.210.139]) by cuda.sgi.com with ESMTP id YUSWnmqTggJNOUqC for ; Tue, 16 Jun 2009 10:32:40 -0700 (PDT) Message-ID: <4A37D737.70004@sandeen.net> Date: Tue, 16 Jun 2009 12:32:39 -0500 From: Eric Sandeen MIME-Version: 1.0 Subject: Re: XFS Preallocate using ALLOCSP References: <24042506.post@talk.nabble.com> <4A3712BF.7030101@sandeen.net> <8770d98c0906152344p185533a9rc144a5667d13d2de@mail.gmail.com> <4A37B744.9030301@sandeen.net> <0B774481-16A5-42FC-89C3-91096E59E861@sgi.com> <8770d98c0906161028j1cc5cbadl49d30092fddf3dbe@mail.gmail.com> In-Reply-To: <8770d98c0906161028j1cc5cbadl49d30092fddf3dbe@mail.gmail.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Smit Shah Cc: linux-xfs@oss.sgi.com Smit Shah wrote: > On 6/16/09, Felix Blyakher wrote: >> On Jun 16, 2009, at 10:16 AM, Eric Sandeen wrote: >>> Maybe I should ask what the end goal is here. :) >>> > Just to see if preallocation using fallocate helps reducing the > fragmentation and increases the throughput. I guess it wll help > reduce the fragmentation but the write performance is going to suffer. Depends on the IO you do, I think. I'd be curious to know exactly how you're running preallocation & iometer so I could give it a shot, to see why xfs seems to be doing worse than ext4. Thanks, -Eric _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs