From: Carsten Aulbert Subject: Re: Tracing down 250ms open/chdir calls Date: Mon, 16 Feb 2009 14:00:48 +0100 Message-ID: <49996380.1090902@aei.mpg.de> References: <49991BE7.1090104@aei.mpg.de> <1234788998.7708.40.camel@heimdal.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, beowulf-r+SMWMTQ9DpAfugRpC6u6w@public.gmane.org To: Trond Myklebust Return-path: Received: from welcomes-you.com ([85.214.50.128]:33371 "EHLO smtp.welcomes-you.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755667AbZBPNBM (ORCPT ); Mon, 16 Feb 2009 08:01:12 -0500 In-Reply-To: <1234788998.7708.40.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: Hi Trond, Trond Myklebust schrieb: > 2.6.27.7 has a known NFS client performance bug due to a change in the > authentication code. The fix was merged in 2.6.27.9: see the commit > http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.27.y.git&a=commitdiff&h=a0f04d0096bd7edb543576c55f7a0993628f924a Maybe that's also a reason why we don't see it that often anymore - although the user load has shifted a bit also. We are running 2.7.27.14 (and .15 since Friday). Thanks for letting me know, I'll probably re-run the tests again with a newer kernel. Cheers Carsten