[openib-general] [PATCH 3/5 v3] 2.6.20 rdma/cma: allow early transition to RTS to handle lost CM messages

[Sean Hefty]

>Yes, I've even observed this with SDP, but I'm not sure why this
>happens. It seems that MADs are sometimes lost even in back to back
>configurations. Any idea why?

I have no idea why MADs would be lost.  In our scale up testing, we *never* saw
lost or dropped MADs to the SA node, even when hitting it with 500,000 queries.
The fact that you're seeing lost MADs is something that we should probably look
into more, someday, hopefully, when I have more time available...  We didn't
notice any issues with the CM messages in our testing, so we didn't examine that
traffic in more detail.

Are there counters for QP0/1 that can let us know whether drops are occurring on
the send or receive side?

- Sean