[openib-general] Multicast Group Routing Question

[Hal Rosenstock]

On Wed, 2006-12-06 at 13:48, Sean Hubbell wrote:
> Hal Rosenstock wrote:
> > Hi Sean,
> >
> > On Wed, 2006-12-06 at 12:52, Sean Hubbell wrote:
> >   
> >> Hello,
> >>
> >>   I was testing our code and noticed that when I send data using 
> >> multicast over our ib0 interface, all of the infiniband switches route 
> >> the data to each switch and each node instead of a node that has an 
> >> application listening to the interface like Ethernet. Is this by design?
> >>     
> >
> > It depends on what multicast group is being used and which end nodes
> > have registered for that group as to where the data is routed.
> >
> > -- Hal
> >   
> Hey Hal,
> 
>   The multicast group I am sending data to is 224.10.10.x (not 
> 224.0.0.x) and I have no clients / nodes listening but the data is still 
> being sent.

Yes, if there is only a sender, the data should not be routed anywhere.

>  I am using wwtop from warewulf to view the network load for 
> each node.

I'm not familiar with those tools.

>  Does this make sense?

Nope. To state the obvious, something is not as it seems...

Can you state which SM you are using ?

Also, can you do the following:
saquery -g
saquery -m
and send me the output.

I may have some more experiments once I get that level of info.

-- Hal

> Sean