linux-kernel - Re: NFS client packet storm on 2.6.27.x

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Date:	Wed, 29 Apr 2009 16:57:53 +0200
From:	Kasparek Tomas <kasparek@....vutbr.cz>
To:	Steve Dickson <SteveD@...hat.com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: NFS client packet storm on 2.6.27.x

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@....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@...ber.cz
  GPG: 2F1E 1AAF FD3B CFA3 1537  63BD DCBE 18FF A035 53BC

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