Re: Unable to Connect Using Active Speed 2.5 Gbps and Active Width of 1

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Mon, Mar 28, 2011 at 07:26:46PM +0000, Alan Cook wrote:
> Hal Rosenstock <hal@...> writes:
> > 
> > LinkWidthEnabled is 1X or 4X and not just 1X. That's because there's no 
> > force_link_width option in OpenSM so I think the width you set is 
> > getting overwritten much like the speed was earlier until you discovered 
> > force_link_speed 0.
> 
> But I see LinkWidthActive set to 1X, which as I understood denoted the width
> currently being used.  If I set LinkWidthActive to 4X, I am able to transfer
> just fine.
> 
> Also, I do see LinkWidthEnabled being changed from "1X" to "1X or 4X" (most
> likely by OpenSM as you suggest), but only after the link is up and active.
> 
> I am able to transfer at 5 Gbps 1X and 10 Gbps 1X, just not 2.5 Gbps 1X.

Are you using IPoIB to test your ping? You might be having multicast
group membership join problems due to a rate mismatch? Try one of the
low level verbs only diags.

Jason
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html