From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:49875 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754872Ab1G1VsO convert rfc822-to-8bit (ORCPT ); Thu, 28 Jul 2011 17:48:14 -0400 Subject: Re: NFSv4 vs NFSv3 with MPICH2-1.4 From: Trond Myklebust To: Gregory Magoon Cc: linux-nfs@vger.kernel.org Date: Thu, 28 Jul 2011 17:47:57 -0400 In-Reply-To: <20110728172449.8wxxte4jg0s8kcgs@webmail.mit.edu> References: <20110728152306.219iz5wpkcokoo4c@webmail.mit.edu> <1311886684.27285.8.camel@lade.trondhjem.org> <20110728172449.8wxxte4jg0s8kcgs@webmail.mit.edu> Content-Type: text/plain; charset="UTF-8" Message-ID: <1311889677.27285.14.camel@lade.trondhjem.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 On Thu, 2011-07-28 at 17:24 -0400, Gregory Magoon wrote: > Thanks for the tips...unfortunately, making the changes you suggest (removing > timeo, rsize, wsize options) doesn't seem to address the issue with MPICH2 and > NFSv4. Have you turned off delegations on the server? I wouldn't expect them to help much on an MPI workload. Otherwise, you might want to post a comparison of your results from 'nfsstat' for your workload on NFSv3 and NFSv4. -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@netapp.com www.netapp.com