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

[Woodruff, Robert J]

Michael wrote,
 >> BTW, Roland, could you give me some indication on whether this
 >> has a chance getting into 2.6.20? If yes I'll stop writing new code
 >> and focus on polishing this.

>I think we could probably merge it but maybe it's better to put it in
>-mm for a cycle given that it's new and not too many people have
>looked at it yet.  And I still haven't gotten comfortable with the way
>CM is enabled.

>- R.

I think it might be good for others in the OFA community to try this out
before we decide it is ready for the kernel. I tried it out over the
weekend,
running Intel MPI over IPoIB_CM, and with default MTU settings,
it did not cause any problems
on my small 2 node cluster. Might be good however for someone to load
this up on a larger cluster and test it. I did notice that unless I made
the MTU really big (16K), there was not much benefit (if any) with the
default MTU size. 
I also noticed that when I set the MTU to 16K and ran some stressful MPI
tests,
that my system seemed to get un-responsive like IPoIB was taking up too
much
kernel memory. Thus, I think it best for others to play with this a bit
before it is submitted upstream.

my 2 cents,
woody