<br><tt><font size=2>> Not if the communication is just within each
subnet; only if it is<br>
> across subnets.</font></tt>
<br><tt><font size=2>It will cross the subnets. For my case, each node
has the need of sending message to other nodes than its neighbor, e.g.
A -> D or E->B.</font></tt>
<br>
<br><tt><font size=2>Thanks!</font></tt>
<br><tt><font size=2>Yicheng</font></tt>
<br>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td width=40%><font size=1 face="sans-serif"><b>Hal Rosenstock <hrosenstock@xsigo.com></b>
</font>
<p><font size=1 face="sans-serif">02/01/2008 05:43 PM</font>
<td width=59%>
<table width=100%>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">Yicheng Jia <YJia@tmriusa.com></font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
<td><font size=1 face="sans-serif">general@lists.openfabrics.org, Roland
Dreier <rdreier@cisco.com></font>
<tr valign=top>
<td>
<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: [ofa-general] SA code?</font></table>
<br>
<table>
<tr valign=top>
<td>
<td></table>
<br></table>
<br>
<br>
<br><tt><font size=2>On Fri, 2008-02-01 at 17:07 -0600, Yicheng Jia wrote:<br>
> <br>
> > Are you saying all messages are between adjacent neighbors on
the<br>
> ring ? <br>
> Yes. Say I have 6 nodes: A, B, C, D, E, F, then the ring topo will
be<br>
> A<->B, B<->C, C<->D, D<->E, E<->F, F<->A,
and there are totally 6<br>
> subnets. <br>
> <br>
> > If it is just A->B, B->C, ..., and never across the ring,
then this<br>
> can<br>
> > work but you need an SM instance per subnet.<br>
> Do I need a router per subnet as well? <br>
<br>
Not if the communication is just within each subnet; only if it is<br>
across subnets.<br>
<br>
> > If you need some router mode, then this is still a work in progress<br>
> for<br>
> > InfiniBand although you might be able to get to a proprietary<br>
> solution<br>
> > in the short term. <br>
> What version of OFED will have router mode available? <br>
<br>
There's already the beginnings of this but I don't know when a complete<br>
solution would be available.<br>
<br>
-- Hal<br>
<br>
> Thanks! <br>
> Yicheng<br>
> <br>
> <br>
> <br>
> Hal Rosenstock<br>
> <hrosenstock@xsigo.com> <br>
> <br>
> 02/01/2008 04:45 PM <br>
> <br>
> <br>
> To<br>
> Yicheng Jia<br>
> <YJia@tmriusa.com> <br>
> cc<br>
> general@lists.openfabrics.org, Roland Dreier <rdreier@cisco.com>
<br>
> Subject<br>
> Re: [ofa-general]<br>
> SA code?<br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> Hi Yicheng,<br>
> <br>
> On Fri, 2008-02-01 at 16:38 -0600, Yicheng Jia wrote:<br>
> > <br>
> > Hi Hal, <br>
> > <br>
> > The only reason is cost down.<br>
> <br>
> Understood.<br>
> <br>
> > The cost of IB switch weighs too much in our product, it
seems the<br>
> > ring topology is the only way to go. There's no message across
the<br>
> > ring, all the communication occurs within the ring. <br>
> <br>
> Are you saying all messages are between adjacent neighbors on the<br>
> ring ?<br>
> <br>
> > Would it cause the performance substantially go down? <br>
> <br>
> If it is just A->B, B->C, ..., and never across the ring, then
this<br>
> can<br>
> work but you need an SM instance per subnet.<br>
> <br>
> If you need some router mode, then this is still a work in progress<br>
> for<br>
> InfiniBand although you might be able to get to a proprietary solution<br>
> in the short term.<br>
> <br>
> -- Hal<br>
> <br>
> > Thanks!<br>
> > Yicheng <br>
> > <br>
> > <br>
> > <br>
> > Hal Rosenstock<br>
> > <hrosenstock@xsigo.com> <br>
> > <br>
> > 02/01/2008 04:25 PM <br>
> > <br>
> > <br>
> > To<br>
> > Yicheng Jia<br>
> > <YJia@tmriusa.com> <br>
> > cc<br>
> > Roland Dreier<br>
> > <rdreier@cisco.com>, general@lists.openfabrics.org <br>
> > Subject<br>
> > Re: [ofa-general]<br>
> > SA code?<br>
> > <br>
> > <br>
> > <br>
> > <br>
> > <br>
> > <br>
> > <br>
> > <br>
> > On Fri, 2008-02-01 at 16:14 -0600, Yicheng Jia wrote:<br>
> > > <br>
> > > Hi Roland, <br>
> > > <br>
> > > Is there SA code available in OFED? I have a IB switch to
connect<br>
> > all<br>
> > > the mellanox HCAs, the SA is running on the switch's firmware.
My<br>
> > goal<br>
> > > is to skip the switch and use ring topology to connect the
HCA<br>
> with<br>
> > > each other. Is it doable in OFED? <br>
> > <br>
> > I don't understand what you're trying to accomplish with this<br>
> > topology.<br>
> > In IB speak, each HCA <-> HCA link would be a separate
subnet. Do<br>
> you<br>
> > intend to forward across your ring ? If so, only some "router"
mode<br>
> > would allow that with the topology you propose.<br>
> > <br>
> > -- Hal<br>
> > <br>
> > > Thanks!<br>
> > > Yicheng<br>
> > > _______________________________________________<br>
> > > general mailing list<br>
> > > general@lists.openfabrics.org<br>
> > > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general<br>
> > > <br>
> > > To unsubscribe, please visit<br>
> > http://openib.org/mailman/listinfo/openib-general<br>
> > <br>
> > <br>
> ><br>
> _____________________________________________________________________________<br>
> > Scanned by IBM Email Security Management Services powered by<br>
> > MessageLabs. For more information please visit<br>
> http://www.ers.ibm.com<br>
> ><br>
> _____________________________________________________________________________<br>
> > <br>
> <br>
> <br>
> _____________________________________________________________________________<br>
> Scanned by IBM Email Security Management Services powered by<br>
> MessageLabs. For more information please visit http://www.ers.ibm.com<br>
> _____________________________________________________________________________<br>
> <br>
<br>
<br>
_____________________________________________________________________________<br>
Scanned by IBM Email Security Management Services powered by MessageLabs.
For more information please visit http://www.ers.ibm.com<br>
_____________________________________________________________________________<br>
</font></tt>
<br>