From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265080AbTIJPmx (ORCPT ); Wed, 10 Sep 2003 11:42:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265084AbTIJPmx (ORCPT ); Wed, 10 Sep 2003 11:42:53 -0400 Received: from pc1-cwma1-5-cust4.swan.cable.ntl.com ([80.5.120.4]:63118 "EHLO dhcp23.swansea.linux.org.uk") by vger.kernel.org with ESMTP id S265080AbTIJPmo (ORCPT ); Wed, 10 Sep 2003 11:42:44 -0400 Subject: Re: NFS/MOUNT/sunrpc problem? From: Alan Cox To: Marco Bertoncin - Sun Microsystems UK - Platform OS Development Engineer Cc: Linux Kernel Mailing List In-Reply-To: <200309101437.h8AEbV108262@brk-mail1.uk.sun.com> References: <200309101437.h8AEbV108262@brk-mail1.uk.sun.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1063208491.32726.66.camel@dhcp23.swansea.linux.org.uk> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.4 (1.4.4-5) Date: Wed, 10 Sep 2003 16:41:31 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mer, 2003-09-10 at 15:37, Marco Bertoncin - Sun Microsystems UK - Platform OS Development Engineer wrote: > - PXE booting x86 'headless' blades (2.0 Ghz 2P Xeon) to install RedHat 8.0 > (kernel 2.4.18). Update the kernel once installed, the 2.4.18- kernels are obsoleted by other security fixes > - the blade, after 3 seconds, starts a storm of retransmit (MOUNT reqs) that > won't stop, unless an ACK (one of the several ACKS sent for each retransmitted > requests) has the chance to get through. This is sometimes after a few hundreds > packets, sometimes after a lot more, causing an apparent hang of the > installation process, and what's even worse, bringing to a grinding halt the > server (bombarded by near 1Gbit/sec packets). I've seen one other report of this (with a via chip), > Ah, one last experiment I did was to try and reproduce the problem on an > installed blade (same version of the kernel). No chance. I noticed, though that > the MOUNT request sent by the 'installed linux' (it would be a proper i686-smp > build instead of a up i386) is V3, whilst that during installation is V2. > Thinking this might have been a hunch, I tried "mount -o nfsvers=2 > server:/export /mnt": I saw the requests, the dropped ack (on the server side, > of course) but no storm ...!). Are you using NFS root or just NFS mounts ?