[torqueusers] Torque udp communication

Garrick Staples garrick at usc.edu
Wed Aug 25 15:01:44 MDT 2010

On Wed, Aug 25, 2010 at 04:58:57PM -0400, Sarah Williams alleged:
> Hi Torque users & experts,
> I'm having some issues getting a subset of our worker nodes to talk to
> the pbs server. Using tcpdump we've discovered that the hello message is
> getting dropped because it is too long. The server has MTU 9000, and the
> client has MTU 1500. ( Unfortunately the network card on these worker
> nodes does not support MTU 9000. ) Normally in this situation packets
> would be split, but for some reason these packets are coming across with
> the DF/IP_DONTFRAG flag set.

Do you a router or a vlan boundary between the server and client?

> Does anyone know how to disable use of the DF/IP_DONTFRAG, or
> alternately how to set up Torque not to use UDP at all?

You would have to re-write it.

Garrick Staples, GNU/Linux HPCC SysAdmin
University of Southern California

Life is Good!
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