[openib-general] Multicast Group Routing Question

[Sean Hubbell]

Hal Rosenstock wrote:
> 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
>   
We have a Voltaire HW subnet manager. I do not have the saquery command. 
I'll have to find this and install it. Would the web interface help?

Sean