From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757389AbXKFL22 (ORCPT ); Tue, 6 Nov 2007 06:28:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754143AbXKFL2T (ORCPT ); Tue, 6 Nov 2007 06:28:19 -0500 Received: from [212.12.190.170] ([212.12.190.170]:54284 "EHLO raad.intranet" rhost-flags-FAIL-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752933AbXKFL2S (ORCPT ); Tue, 6 Nov 2007 06:28:18 -0500 From: Al Boldi To: linux-fsdevel@vger.kernel.org Subject: Re: Massive slowdown when re-querying large nfs dir Date: Tue, 6 Nov 2007 14:28:11 +0300 User-Agent: KMail/1.5 Cc: linux-kernel@vger.kernel.org References: <200711050758.38090.a1426z@gawab.com> In-Reply-To: <200711050758.38090.a1426z@gawab.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200711061428.11453.a1426z@gawab.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Al Boldi wrote: > There is a massive (3-18x) slowdown when re-querying a large nfs dir (2k+ > entries) using a simple ls -l. > > On 2.6.23 client and server running userland rpc.nfs.V2: > first try: time -p ls -l <2k+ entry dir> in ~2.5sec > more tries: time -p ls -l <2k+ entry dir> in ~8sec > > first try: time -p ls -l <5k+ entry dir> in ~9sec > more tries: time -p ls -l <5k+ entry dir> in ~180sec > > On 2.6.23 client and 2.4.31 server running userland rpc.nfs.V2: > first try: time -p ls -l <2k+ entry dir> in ~2.5sec > more tries: time -p ls -l <2k+ entry dir> in ~7sec > > first try: time -p ls -l <5k+ entry dir> in ~8sec > more tries: time -p ls -l <5k+ entry dir> in ~43sec > > Remounting the nfs-dir on the client resets the problem. > > Any ideas? Ok, I played some more with this, and it turns out that nfsV3 is a lot faster. But, this does not explain why the 2.4.31 kernel is still over 4-times faster than 2.6.23. Can anybody explain what's going on? Thanks! -- Al