Re: need pointer to Understand how to use IBV_WR_RDMA_WRITE_WITH_IMM

[Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>]

On 06/07/2011 11:31 AM, Jason Gunthorpe wrote:
> On Tue, Jun 07, 2011 at 07:18:14AM -0700, Steven Dake wrote:
>> On 06/07/2011 05:23 AM, Benoit Hudzia wrote:
>>> I am uncertain if this is the correct place for such email, please
>>> point me to an appropriate mailing list place if not.
>>>
>>> I would like to use IBV_WR_RDMA_WRITE_WITH_IMM , however I am facing
>>> difficulty to find documentation or example on how to use such
>>> feature.  The idea would be to do an RDMA write and wake up the peer
>>> upon reception in order to process the received data.
>>>
>>> What I understand from IBV_WR_RDMA_WRITE_WITH_IMM:
>> I would recommend against using IMM modes.  I believe they are not
>> supported on non-infiniband hardware, which limits your application from
>> being used on Ethernet rdma systems.
> There is some talk of fixing that in iWarp, the IMM stuff is much more
> efficient than a RDMA + SEND combo.
>

iWARP 2.0: http://datatracker.ietf.org/doc/draft-ietf-storm-rdmap-ext/


> If you are going to use it, and care about iWarp then you should
> design a fall back into your protocol to use RDMA + SEND.. I have some
> stuff that works like this.
>
> Jason
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