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

[Alan Cook <acook-osxm6dDZNBBZx8iatJs59jGjJy/sRE9J@public.gmane.org>]

Jason Gunthorpe <jgunthorpe@...> writes:

> 
> 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.
> 

I found the following issue when running ibdiagnet (which I had yet to run).

-I---------------------------------------------------
-I- IPoIB Subnets Check
-I---------------------------------------------------
-I- Subnet: IPv4 PKey:0x7fff QKey:0x00000b1b MTU:2048Byte rate:10Gbps SL:0x00
-W- Port raid1/P1 lid=0x0002 guid=0x0002c903000aa6d7 dev=26428 can not join due
    to rate:2.5Gbps < group:10Gbps
-W- Port raid2/P1 lid=0x0001 guid=0x0002c903000aa6cf dev=26428 can not join due
    to rate:2.5Gbps < group:10Gbps
-W- Suboptimal rate for group. Lowest member rate:120Gbps > group-rate:10Gbps

I also changed the speed to 5 Gbps (which I thought had worked earlier) and I am
unable to transfer using a width 1X.  I receive the same warnings as above.

After doing some searching, I created a partitions.conf (which did not exist at
configured location in opensm.conf).  I added the following line:

Test,ipoib,rate=1,defmember=full:0x0002c903000aa6d7,0x0002c903000aa6cf;

After restarting opensm.conf, I find that the above warnings in ibdiagnet no
longer appear, but I am still unable to communicate between PCs.

Did I miss something or do something incorrectly?

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