[ofa-general] SA code?
Yicheng Jia
YJia at tmriusa.com
Fri Feb 1 15:46:45 PST 2008
Unfortunately I have 9 nodes.
Thanks!
Yicheng
"Timothy A. Meier" <meier3 at llnl.gov>
02/01/2008 05:39 PM
To
Yicheng Jia <YJia at tmriusa.com>
cc
general at lists.openfabrics.org
Subject
Re: [ofa-general] SA code?
Yicheng Jia wrote:
>
> > 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 you only plan on 6 nodes, you can get an 8 port switch for ~ $750
http://www.colfaxdirect.com/store/pc/viewCategories.asp?pageStyle=m&idCategory=7
>
> > 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
> >
> >
> >
>
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--
Timothy A. Meier
Computer Scientist
ICCD/High Performance Computing
925.422.3341
meier3 at llnl.gov
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