Re: [PATCH 0/3] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"

Kasparek Tomas
2009-02-10T07:55:15Z

On Fri, Feb 06, 2009 at 07:35:13AM +0100, Kasparek Tomas wrote:
> > > A binary wireshark dump of the traffic between one such client and the
> > > server would help.
> >
> > I tried to get some data several times, but the client is dead and the
> > server is overloaded so much, that I'm unable to get anything reasonable. I
> > did tried to insert another mechine in front of the client as a bridge, but
> > the traffic overloaded it the same way as the server. I will try to figure
> > out how to get some traffic dump, but have no other idea for now.

> as another try, I did upgrade from 2.6.27.10 to 2.6.27.13 (and .14) and it
> looks like the problem disappeared. Righ now I'm running 5 clients with .13
> or .14 and tcpdumps for 3 days without any problem. I will try to stop
> tcpdumps as they can potentially influence behaviour and will confirm the
> state next week.

After 6 days all machines except the first client used are fine and have no
problems. Based on this I would conclude that:

- your patch fixes the problem I had
- there may be something wrong in <2.6.27.13, but it's ok in .13+
- I finnaly have some tcpdumps from the server concerning the first
problematic client, I will try to extract interesting packets and send it
here if you or someone else can find anything helpfull there. With .14
the client runs much better anyway staying alive for 3 days instead of
6-10hours as with .10

Thank you for your support.

--

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

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