[ofa-general] oversubscription

[Hal Rosenstock]

On Wed, 2007-03-14 at 02:24, Yevgeny Kliteynik wrote:
> 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

Same info on fat tree is in the opensm man page.

-- Hal


> -- 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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> >>
> >>
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