From: Wendy Cheng Subject: Re: [NFS] NFS Digest, Vol 18, Issue 70 (NFS performance problems) Date: Tue, 20 Nov 2007 16:23:21 -0500 Message-ID: <47435049.1010800@redhat.com> References: <47434ED7.4010100@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Wendy Cheng , nfs@lists.sourceforge.net To: Peter Staubach Return-path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.91] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1Iuab9-0008F1-64 for nfs@lists.sourceforge.net; Tue, 20 Nov 2007 13:25:35 -0800 Received: from mx1.redhat.com ([66.187.233.31]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1IuabE-0001O5-UN for nfs@lists.sourceforge.net; Tue, 20 Nov 2007 13:25:41 -0800 In-Reply-To: <47434ED7.4010100@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Peter Staubach wrote: > Wendy Cheng wrote: >> >>> top - 15:50:56 up 20 days, 1:33, 9 users, load average: 3.42, >>> 2.95, 2.38 >>> >>> 19200 geo0501 15 0 75076 5224 3480 S 2 0.1 0:07.94 >>> smbd 2336 root 10 -5 0 0 0 S 1 >>> 0.0 57:07.70 kjournald 2334 root 10 -5 0 >>> 0 0 S 1 0.0 33:19.89 kjournald 2279 root 10 >>> -5 0 0 0 S 0 0.0 15:10.98 md0_raid1 2283 >>> root 10 -5 0 0 0 S 0 0.0 24:45.79 >>> md1_raid1 3935 root 15 0 0 0 0 S 0 >>> 0.0 14:04.25 nfsd 3943 root 15 0 0 >>> 0 0 S 0 0.0 14:18.43 nfsd 3947 root 15 >>> 0 0 0 0 S 0 0.0 13:57.06 nfsd 8325 >>> ed0127 15 0 75044 4812 3264 S 0 0.1 0:01.29 >>> smbd >> >> Intuitively (based on ext3's journal threads info above) I would >> suspect this is due to the change of the export default option from >> "async" to "sync" between 2.6.9 and 2.6.18 kernels. So go to your >> /etc/exports file and explicitly set the export option to "async" to >> see whether you can get the performance back. >> >> e.g. changes "/server *(rw)" to "/server *(async, rw)". > > While this may or may not restore your performance aspects, it > is not safe to make this change. The change was made for a > reason. Not to start a flame war :) but please read his email. His *old* system, that uses "async" option", has been running fine for several years. Why all of sudden, an "async" option is such a big issue ? -- Wendy > > Please any and all other possibilities before making this change. > It is not free. > > Thanx... > > ps ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs _______________________________________________ Please note that nfs@lists.sourceforge.net is being discontinued. Please subscribe to linux-nfs@vger.kernel.org instead. http://vger.kernel.org/vger-lists.html#linux-nfs