From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758154AbWK0MqH (ORCPT ); Mon, 27 Nov 2006 07:46:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758157AbWK0MqH (ORCPT ); Mon, 27 Nov 2006 07:46:07 -0500 Received: from web32615.mail.mud.yahoo.com ([68.142.207.242]:7773 "HELO web32615.mail.mud.yahoo.com") by vger.kernel.org with SMTP id S1758154AbWK0Mp5 (ORCPT ); Mon, 27 Nov 2006 07:45:57 -0500 X-YMail-OSG: zgJ.VkUVM1kRbL36dkOD6oJDy6nNFVEDt9lXo33XVHDfj1fXriZkuQBDuFQiDcw38A-- X-RocketYMMF: knobi.rm Date: Mon, 27 Nov 2006 04:45:55 -0800 (PST) From: Martin Knoblauch Reply-To: knobi@knobisoft.de Subject: File-locking problems with RHEL4 kernel (2.6.9-42.0.3.ELsmp) under high load To: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Message-ID: <892617.7429.qm@web32615.mail.mud.yahoo.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, first of all, yes - I know that this kernel is very old and it is not an official LKML kernel. No need to tell me, no need to waste bandwidth by telling me :-) I just post here, because I got no response "elsewhere". Second - please CC me on any reply, as I am not subscribed. OK. Here is the problem. Said RHEL4 kernel seems to have problems with file-locking when the system is under high, likely network related, load. The symptoms are things using file locking (rpm, the user-space automounter amd) fail to obtain locks, usually stating timeout problems. The sytem in question is a HP/DL380G4 with dual-single-core EM64T CPUs and 8GB of Memory. The network interfaces are "tg3". The high load can be triggered by copying three 3 GB files in parallel from an NFS server (Solaris10, NFS, TCP, 1GBit) to another NFS server (RHEL4, NFS, TCP, 100 MBit). The measured network performance is OK. During this operation the systems goes to Loads around/above 10. Overall responsiveness feels good, but software doing file-locking or opening a new ssh connection take extremely long. So, if anyone has an idea or hint, it will be highly appreciated. Cheers Martin ------------------------------------------------------ Martin Knoblauch email: k n o b i AT knobisoft DOT de www: http://www.knobisoft.de