[torqueusers] Torque udp communication

Ken Nielson knielson at adaptivecomputing.com
Wed Aug 25 15:02:33 MDT 2010


On 08/25/2010 02:58 PM, Sarah Williams wrote:
> 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.
>
> 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?
>
> --Sarah Williams
> _______________________________________________
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> torqueusers at supercluster.org
> http://www.supercluster.org/mailman/listinfo/torqueusers
>    
UDP cannot currently be disabled for TORQUE. However, the hello packet 
itself is only a few bytes. The server will return the addresses of all 
the nodes in the cluster. How many nodes are in your cluster?

Ken Nielson
Adaptive Computing


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