From: Peter Staubach Subject: Re: [NFS] NFS Digest, Vol 18, Issue 70 (NFS performance problems) Date: Tue, 20 Nov 2007 16:17:11 -0500 Message-ID: <47434ED7.4010100@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: nfs@lists.sourceforge.net, wcheng@redhat.com To: Wendy Cheng Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list2-new.sourceforge.net with esmtp (Exim 4.43) id 1IuaT4-0007N5-1O for nfs@lists.sourceforge.net; Tue, 20 Nov 2007 13:17:14 -0800 Received: from mx1.redhat.com ([66.187.233.31]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1IuaT9-0005XU-NH for nfs@lists.sourceforge.net; Tue, 20 Nov 2007 13:17:20 -0800 In-Reply-To: Sender: linux-nfs-owner@vger.kernel.org List-ID: 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. 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