Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755352AbYLJBNI (ORCPT ); Tue, 9 Dec 2008 20:13:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753844AbYLJBMy (ORCPT ); Tue, 9 Dec 2008 20:12:54 -0500 Received: from mail-bw0-f13.google.com ([209.85.218.13]:53525 "EHLO mail-bw0-f13.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753770AbYLJBMx (ORCPT ); Tue, 9 Dec 2008 20:12:53 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references:x-google-sender-auth; b=wudOSMSm5vTDeSHtTYozmNyVVRhhAD+XQdLVK7fBLFglwLLLYxyl7t+XnzeIx9Juqj BzgXcDMS492vl7Wcva7RUZLH5pGfEAIGvTkAB5ReEBt/ua9JzStxz44FdT+Zn/HEZe4e g+hjRToIJUG0XhftcxklmrxB8FFTZXBiLzRdQ= Message-ID: <2c0942db0812091712l5efa2d2dia9ff2e3d92f81bbc@mail.gmail.com> Date: Tue, 9 Dec 2008 17:12:46 -0800 From: "Ray Lee" To: "Trond Myklebust" , pkpatel.lists@gmail.com Subject: Re: Fwd: 2.6.26.3 kernel - progressive slowdown over NFS Cc: LKML , linux-nfs@vger.kernel.org, Netdev In-Reply-To: <1228871206.30231.76.camel@heimdal.trondhjem.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <2c0942db0812091638o3d0fe68ek70744f6938949b25@mail.gmail.com> <1228871206.30231.76.camel@heimdal.trondhjem.org> X-Google-Sender-Auth: 8de2ef99fe7e59ed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1767 Lines: 44 [ sigh, adding back original reporter. Oops. -- rbl ] Priyank Patel, please see Trond's response below and try out the suggested patch linked below. On Tue, Dec 9, 2008 at 5:06 PM, Trond Myklebust wrote: > On Tue, 2008-12-09 at 16:38 -0800, Ray Lee wrote: >> [ adding netdev, linux-nfs to cc: -- rbl ] >> >> Hi, >> >> >> We have a simple python program which keeps running a C loop to lstat >> NFS mounted directories. We are seeing some weird behavior w.r.t. the >> run-time of this program on 2.6.26.3 kernel vs 2.6.24 kernel. >> >> The run-time of the following code increases over time on the 2.6.26.3 >> kernel, whereas remains flat (as expected) on the 2.6.24 kernel. >> [See attached graphs - B1.jpg and B2.jpg] Once the 2.6.26.3 machine >> gets into this state, we need to restart the box to get back to >> reasonable run-times. Is this a known issue ? > > Could you try applying the following patch? > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git&a=commitdiff&h=23918b03060f6e572168fdde1798a905679d2e06 > > Trond > > PS: note that your 2.6.26 config file has _very_ different memory models > and kernel debugging options enabled compared to your 2.6.24 kernel. > That may also affect performance. > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/