From: Yusuf Goolamabbas Subject: Re: Poor NFS performance, kernel 2.6.6. Date: Tue, 1 Jun 2004 08:16:58 +0800 Sender: nfs-admin@lists.sourceforge.net Message-ID: <20040601001658.GA7373@outblaze.com> References: <1085695748.23934.94.camel@lade.trondhjem.org> <20040528135515.GG5657@suse.de> <1085771968.3882.17.camel@lade.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Harald Hannelius , Olaf Kirch , nfs@lists.sourceforge.net Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1BUwxm-00079A-1n for nfs@lists.sourceforge.net; Mon, 31 May 2004 17:17:06 -0700 Received: from corpmail.outblaze.com ([203.86.166.82]) by sc8-sf-mx1.sourceforge.net with esmtp (Exim 4.30) id 1BUwxl-0000NN-4R for nfs@lists.sourceforge.net; Mon, 31 May 2004 17:17:05 -0700 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by corpmail.outblaze.com (Postfix) with ESMTP id A8A4337AD5 for ; Tue, 1 Jun 2004 00:16:59 +0000 (GMT) Received: from yusufg.portal2.com (210-177-227-130.outblaze.com [210.177.227.130]) by corpmail.outblaze.com (Postfix) with SMTP id E193D16DD91 for ; Tue, 1 Jun 2004 00:16:58 +0000 (GMT) To: Trond Myklebust In-Reply-To: <1085771968.3882.17.camel@lade.trondhjem.org> Errors-To: nfs-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Post: List-Help: List-Subscribe: , List-Archive: > > I guess (as a total don't-know) that nfsd reads and writes files in a > > different way than local processes do. I read somewhere something about > > read-ahead but that was in 2.6.0-pre-something.. > > Hmm... The current readahead code does a load of crap in order to > determine whether or not the user is doing linear or random I/O. It may > be that the nfsd server with all its multi-threading and out-of-sequence > I/O is triggering the random I/O readahead code (which of course aims to > limit readahead). Any thoughts on this patch posted to lkml http://marc.theaimsgroup.com/?l=linux-kernel&m=108603045809565&w=2 Regards, /yg ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs