<br><tt><font size=2>> ----- Message from "Shirley Ma" <xma@us.ibm.com>
on Fri, 15 Dec 2006<br>
> 09:06:03 -0800 -----</font></tt>
<br><tt><font size=2>> <br>
> To:</font></tt>
<br><tt><font size=2>> <br>
> "Michael S. Tsirkin" <mst@mellanox.co.il></font></tt>
<br><tt><font size=2>> <br>
> cc:</font></tt>
<br><tt><font size=2>> <br>
> openib-general@openib.org</font></tt>
<br><tt><font size=2>> <br>
> Subject:</font></tt>
<br><tt><font size=2>> <br>
> Re: [openib-general] [PATCHv2] IPoIB CM Experimental support</font></tt>
<br><tt><font size=2>> <br>
> "Michael S. Tsirkin" <mst@mellanox.co.il> wrote on
12/14/2006 09:14:38 PM:<br>
> <br>
> > > Hi, Michael,<br>
> > > <br>
> > > Tried this patch, it didn't work on ehca. I couldn't change
the mode from<br>
> > > datagram to connected from /sys/class.<br>
> > <br>
> > It's wroking as designed in that respect. ehca does not
implement <br>
> > srq - without<br>
> > srq, there is no way to prepost receive buffers for a resonable
number of<br>
> > connections without running out of memory.<br>
> > <br>
> > So it is falling back on datagram mode.<br>
> > Talk to ehca guys to implement srq and connected mode will be
enabled.<br>
> Don't remember SRQ is a MUST for UC mode. Does this patch support
<br>
> devices with SRQ in RC mode?<br>
</font></tt>
<br><tt><font size=2>I don't think the IB HCA Spec requires SRQ support
for RC but is an optional feature. There are two adapters right now that
don't support SRQ which means to use IPoIB-CM on them you should make the
use of SRQ an option setting. I agree that if it is available it should
be used for scaling issues probably if available automatically set. But
I would like to see us at least support the current hardware that meets
the current SPEC.</font></tt>
<br><font size=2 face="sans-serif"><br>
Bernie King-Smith <br>
IBM Corporation<br>
Server Group<br>
Cluster System Performance <br>
wombat2@us.ibm.com (845)433-8483<br>
Tie. 293-8483 or wombat2 on NOTES <br>
<br>
"We are not responsible for the world we are born into, only for the
world we leave when we die.<br>
So we have to accept what has gone before us and work to change the only
thing we can,<br>
-- The Future." William Shatner</font>