[rds-devel] The meaning of MR invalidation

[Olaf Kirch]

> Yes, this needs some performance measurements.

... and the bad news is, if I change the code to use FMRs
exactly once, I lose roughly 10% in performance. I ran with
1, 2, and 4 tasks, a wide range of message sizes and RDMA sizes
from 64k to 1M. The degradation was pretty similar across
all test runs.

So there is a strong case to reuse FMRs. The last nagging worry
I have is, what happens when I remap a FMR - does that invalidate
the old mapping, or not?

Olaf
-- 
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