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 o8NM2j9m150627 for ; Thu, 23 Sep 2010 17:02:45 -0500 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 3C9C19833E for ; Thu, 23 Sep 2010 15:03:40 -0700 (PDT) Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id YBuKy4BGmfObUuPn for ; Thu, 23 Sep 2010 15:03:40 -0700 (PDT) Received: from [192.168.100.53] (gffx.hardwarefreak.com [192.168.100.53]) by greer.hardwarefreak.com (Postfix) with ESMTP id 7FBF06C0BA for ; Thu, 23 Sep 2010 17:03:39 -0500 (CDT) Message-ID: <4C9BCEBB.4030800@hardwarefreak.com> Date: Thu, 23 Sep 2010 17:03:39 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: Question regarding performance on big files. References: <4C979439.7070906@opencubetech.com> <4C97BA74.5030304@hardwarefreak.com> <4C99D9EB.20800@opencubetech.com> <4C9A69DC.8020606@hardwarefreak.com> <4C9B161A.1010301@opencubetech.com> In-Reply-To: <4C9B161A.1010301@opencubetech.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: xfs@oss.sgi.com Mathieu AVILA put forth on 9/23/2010 3:55 AM: > The small writes are amortized in the stream of data writes from the > application, and the application is not frozen. > (so you were right: there was a page cache issue) Given what you've described about the streaming write behavior of your application, I'd suggest you rewrite it and use O_DIRECT writes to bypass the page cache completely. You may also want to look into using the XFS realtime subvolume feature. -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs