[ofa-general] SA code?

[Hal Rosenstock]

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
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