[openib-general] [PATCHv2] IPoIB CM Experimental support

[Bernard King-Smith]

> ----- Message from "Michael S. Tsirkin" <mst at mellanox.co.il> on Sat,
> 16 Dec 2006 18:47:09 +0200 -----
> 
> To:
> 
> "Shirley Ma" <xma at us.ibm.com>
> 
> cc:
> 
> openib-general at openib.org
> 
> Subject:
> 
> Re: [openib-general] [PATCHv2] IPoIB CM Experimental support
> 
> > > > Hi, Michael,
> > > >
> > > > Tried this patch, it didn't work on ehca. I couldn't change 
> the mode from
> > > > datagram to connected from /sys/class.
> > >
> > > It's wroking as designed in that respect.  ehca does not implement
> > > srq - without
> > > srq, there is no way to prepost receive buffers for a resonable 
number of
> > > connections without running out of memory.
> > >
> > > So it is falling back on datagram mode.
> > > Talk to ehca guys to implement srq and connected mode will be 
enabled.
> >
> > Don't remember SRQ is a MUST for UC mode. Does this patch support 
> devices with
> > SRQ in RC mode?
> 
> Yes. Only RC mode is supported by this patch.
> >From what you say I am guessing that SRQ is supported by ehca HW but 
support
> is currently lacking in the ehca driver?

The current EHCA hardware does NOT support SRQ.

> 
> -- 
> MST
> 
> 
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Bernie King-Smith 
IBM Corporation
Server Group
Cluster System Performance 
wombat2 at us.ibm.com    (845)433-8483
Tie. 293-8483 or wombat2 on NOTES 

"We are not responsible for the world we are born into, only for the world 
we leave when we die.
So we have to accept what has gone before us and work to change the only 
thing we can,
-- The Future." William Shatner
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