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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. <br><br>
Mike<br><br>
At 09:54 AM 1/24/2008, Steve Wise wrote:<br>
<blockquote type=cite class=cite cite="">Roland Dreier wrote:<br>
<blockquote type=cite class=cite cite="">Sorry to come into this thread
so late, but does it make sense to try<br>
the current SDP code over iWARP? As I understand things, the
RDMA<br>
consortium has its own spec for SDP on iWARP, which may not
precisely<br>
correspond to the IBA SDP annex. So probably the SDP code would
need<br>
updating to work over iWARP.<br>
</blockquote><br>
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.<br><br>
<blockquote type=cite class=cite cite="">(And don't all the iWARP vendors
have TCP offload socket stuff for<br>
their adapters anyway, which is a simpler solution to the same
problem<br>
that SDP solves?)<br>
</blockquote><br>
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).<br><br>
I assume Craig is doing some research to perhaps determine exactly how
SDP performs over iwarp vs TOE or standard TCP.<br><br>
<br>
Steve.<br><br>
<br><br>
<br>
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