Topic
  • 2 replies
  • Latest Post - ‏2012-09-13T14:48:21Z by osc
osc
osc
11 Posts

Pinned topic What is the intent of the new value verbsRdmaCm ?

‏2012-09-12T20:47:24Z |
I notice there are some new settings available for tuning in GPFS 3.5. One that I'm curious about is verbsRdmaCm enable|disable.
Does this mean Communication Manager support is now available, and wasn't used before? Is there a good reason to start using it for those of us using RDMA already?

I have some limited knowledge of cm, from the OFED world and I am curious how rDMA was being done before if cm starts disabled? heh.

from mmfsadm dump config :
verbsRdmaCm disable
verbsRdmaCmLibName librdmacm.so
Updated on 2012-09-13T14:48:21Z at 2012-09-13T14:48:21Z by osc
  • sdenham
    sdenham
    70 Posts

    Re: What is the intent of the new value verbsRdmaCm ?

    ‏2012-09-12T21:37:13Z  
    This is Connection Mode RDMA connections, instead of datagram mode. It is not currently supported - sometimes things appear "under the covers" in the undocumented parameters that are not fully implemented or tested.
  • osc
    osc
    11 Posts

    Re: What is the intent of the new value verbsRdmaCm ?

    ‏2012-09-13T14:48:21Z  
    Rats. I hate when it's the answer I expect and wish wasn't. heh. Ah well. Couple of releases we can probably start performance testing to see which streams better.

    Thanks.