[ofa-general] oversubscription

[Yevgeny Kliteynik]

Hal Rosenstock wrote:
> On Tue, 2007-03-13 at 17:30, SEGERS Koen wrote:
>> I'm trying to resolve an oversubscription problem of 1 server
>> receiving streams from 4 hosts.
>>  
>> If you connect the server with 4 cables to the switch, it should be
>> resolved when I define the routes that should be used. But is it
>> possible to define the routing tables in the subnet manager?
> 
> Depends on the SM as to whether this is supported or not. OpenSM
> supports the ability to do this as do some vendor SMs.
> 
>> Maybe just running the fattree routing module is sufficient?
> 
> I'm not sure; Yevgeny would be the best to answer this.

What is the fabric topology?

Basically, you can try using fat-tree routing, and if the topology
is not a fat-tree, OpenSM will issue an error message and will use
default routing.
You can get more details from the osm/doc/current-routing.txt

-- Yevgeny

>>  I also saw that it is possible to set the routes by using a file. Can
>> someone give an example of this?
> 
> This capability is documented in the opensm man page. You can obtain
> this file via dump_lfts.sh script.
> 
>> Currently I'm trying a combination of partitioning and linux routing.
>> Is this a good idea?
> 
> What do you mean by Linux routing ? Is this IP routing ?
> 
> -- Hal
> 
>> BTW: we are only interested in SDP and IPoIB. In a previous thread I
>> discovered that bonding/aggregation/merging is not possible in an
>> active/active situation. So this doesn't improve our setup.
>>  
>> greetz,
>>  
>> Koen
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