From: Kasparek Tomas Subject: Re: NFS client packet storm on 2.6.27.x Date: Wed, 29 Apr 2009 16:57:53 +0200 Message-ID: <20090429145753.GL2865@fit.vutbr.cz> References: <20090113152201.GD47559@fit.vutbr.cz> <20090116104802.GF47559@fit.vutbr.cz> <20090118130835.GH47559@fit.vutbr.cz> <20090120150301.GG47559@fit.vutbr.cz> <1232465547.7055.3.camel@heimdal.trondhjem.org> <20090303120848.GV89843@fit.vutbr.cz> <1236089767.9631.4.camel@heimdal.trondhjem.org> <20090418051739.GL64731@fit.vutbr.cz> <20090422172707.GC57877@fit.vutbr.cz> <49F84436.5090007@RedHat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org To: Steve Dickson Return-path: Received: from kazi.fit.vutbr.cz ([147.229.8.12]:56849 "EHLO kazi.fit.vutbr.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751223AbZD2O6O (ORCPT ); Wed, 29 Apr 2009 10:58:14 -0400 In-Reply-To: <49F84436.5090007-AfCzQyP5zfLQT0dZR+AlfA@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Wed, Apr 29, 2009 at 08:12:38AM -0400, Steve Dickson wrote: > > I got another client lockup today. It was a desktop so I have some more > > dmesg warnings about soft lockup caused probably by network cable unplug > > (but hopefully still showing what happens in rpciod) on > > > > http://merlin.fit.vutbr.cz/tmp/nfs/pckas-dmesg > > > > I can check with top, that rpciod was using 100% cpu. I limited the flow > > from client to server with firewall so I was able to save the server and > > get some tcpdump -s0 data (actually RPC null with ERR response from server) > > > > Just to remind, the client is 2.6.27.21 (i386), the server is 2.6.16.62 > > (x86_64). > > > > Please let me know if I can do anything more, this is really paintfull for > > me. > Try commenting out the tcp6/udp6 entries from /etc/netconfig.... > This has help in other places... It's CentOS 5.3, but if you mean to disable IPv6, I can not do that, the server is using IPv6 (but not with these clients). And as mentioned before it works well without e06799f958bf7f9f8fae15f0c6f519953fb0257c, both for lockd and client floods. Bye -- Tomas Kasparek, PhD student E-mail: kasparek@fit.vutbr.cz CVT FIT VUT Brno, L127 Web: http://www.fit.vutbr.cz/~kasparek Bozetechova 1, 612 66 Fax: +420 54114-1270 Brno, Czech Republic Phone: +420 54114-1220 jabber: tomas.kasparek-2ASvDZBniIelVyrhU4qvOw@public.gmane.org GPG: 2F1E 1AAF FD3B CFA3 1537 63BD DCBE 18FF A035 53BC