Perhaps we can eventually make the ofed sdp module support both
protocols based on the device transport type...
Michael Krause wrote:
The IETF defines SDP over iWARP. To a very large extent, the main data
path operations are the same. There are differences in the port mapper
and hello exchanges. For the most part, the IETF specification learned
from the problems implementing SDP / IB as well as dealt with the
constraints imposed by the IETF MPA specification. Done right, the
differences should be transparent to applications with only minor
changes required within the underlying library / infrastructure.
Mike
At 09:54 AM 1/24/2008, Steve Wise wrote:
Roland Dreier wrote:
Sorry to come into this thread so late, but does it make sense to try
the current SDP code over iWARP? As I understand things, the RDMA
consortium has its own spec for SDP on iWARP, which may not precisely
correspond to the IBA SDP annex. So probably the SDP code would need
updating to work over iWARP.
I didn't think they were that different, but I don't know for sure.
However, unless the IB-SDP uses atomics or some other IB-specific work
request, it just might work.
(And don't all the iWARP vendors have TCP offload socket stuff for
their adapters anyway, which is a simpler solution to the same problem
that SDP solves?)
Dunno about other vendors, but Chelsio's TOE code is available on
their web site (service.chelsio.com). It will be more efficient than
SDP over iWARP (no SDP/iWARP headers needed).
I assume Craig is doing some research to perhaps determine exactly how
SDP performs over iwarp vs TOE or standard TCP.
Steve.
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