[ofa-general] Re: IPOIB CM (NOSRQ)[PATCH V2] patch for review

[Roland Dreier]

 > As previously stated, IBM HCA will address these issues. However,
 > my understanding is that mthca/Topspin adapters also have a problem
 > (too high a value for the Local CA Delay Ack). Both HCAs need to be
 > fixed for good interoperability.

I think you're misunderstanding what local CA ack delay means.  This
is a property of an HCA that is not (necessarily) subject to tuning --
it is just a property of the HCA, namely the maximum amount of time it
may take to generate an ACK.

So if a certain HCA reports a value of 15, then that means that any
remote HCA talking to it must be prepared for a delay of 4.096 * 2^15
usecs before receiving an ACK.

If the ACK delays on both sides are not being taken into account
properly when establishing a connection, then I guess that is a bug in
our CM.

 - R.