[ofa-general] SA code?

[Yicheng Jia]

> Are you saying all messages are between adjacent neighbors on the ring ?
Yes. Say I have 6 nodes: A, B, C, D, E, F, then the ring topo will be 
A<->B, B<->C, C<->D, D<->E, E<->F, F<->A, and there are totally 6 subnets.

> If it is just A->B, B->C, ..., and never across the ring, then this can
> work but you need an SM instance per subnet.
Do I need a router per subnet as well?

> If you need some router mode, then this is still a work in progress for
> InfiniBand although you might be able to get to a proprietary solution
> in the short term.
What version of OFED will have router mode available?

Thanks!
Yicheng




Hal Rosenstock <hrosenstock at xsigo.com> 
02/01/2008 04:45 PM

To
Yicheng Jia <YJia at tmriusa.com>
cc
general at lists.openfabrics.org, Roland Dreier <rdreier at cisco.com>
Subject
Re: [ofa-general] SA code?






Hi Yicheng,

On Fri, 2008-02-01 at 16:38 -0600, Yicheng Jia wrote:
> 
> Hi Hal, 
> 
> The only reason is cost down.

Understood.

>  The cost of IB switch weighs too much in our product, it seems the
> ring topology is the only way to go. There's no message across the
> ring, all the communication occurs within the ring. 

Are you saying all messages are between adjacent neighbors on the ring ?

> Would it cause the performance substantially go down? 

If it is just A->B, B->C, ..., and never across the ring, then this can
work but you need an SM instance per subnet.

If you need some router mode, then this is still a work in progress for
InfiniBand although you might be able to get to a proprietary solution
in the short term.

-- Hal

> Thanks!
> Yicheng 
> 
> 
> 
> Hal Rosenstock
> <hrosenstock at xsigo.com> 
> 
> 02/01/2008 04:25 PM 
> 
> 
>                To
> Yicheng Jia
> <YJia at tmriusa.com> 
>                cc
> Roland Dreier
> <rdreier at cisco.com>, general at lists.openfabrics.org 
>           Subject
> Re: [ofa-general]
> SA code?
> 
> 
> 
> 
> 
> 
> 
> 
> On Fri, 2008-02-01 at 16:14 -0600, Yicheng Jia wrote:
> > 
> > Hi Roland, 
> > 
> > Is there SA code available in OFED? I have a IB switch to connect
> all
> > the mellanox HCAs, the SA is running on the switch's firmware. My
> goal
> > is to skip the switch and use ring topology to connect the HCA with
> > each other. Is it doable in OFED? 
> 
> I don't understand what you're trying to accomplish with this
> topology.
> In IB speak, each HCA <-> HCA link would be a separate subnet. Do you
> intend to forward across your ring ? If so, only some "router" mode
> would allow that with the topology you propose.
> 
> -- Hal
> 
> > Thanks!
> > Yicheng
> > _______________________________________________
> > general mailing list
> > general at lists.openfabrics.org
> > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general
> > 
> > To unsubscribe, please visit
> http://openib.org/mailman/listinfo/openib-general
> 
> 
> 
_____________________________________________________________________________
> Scanned by IBM Email Security Management Services powered by
> MessageLabs. For more information please visit http://www.ers.ibm.com
> 
_____________________________________________________________________________
> 


_____________________________________________________________________________
Scanned by IBM Email Security Management Services powered by MessageLabs. 
For more information please visit http://www.ers.ibm.com
_____________________________________________________________________________

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openfabrics.org/pipermail/general/attachments/20080201/3cc187c6/attachment.html>