35K PPS of acks is insane, one ack every ms is FAR more than enough to do 'fast
recovery', and outside the datacenter, one ack per 10ms is probably more than
enough.
Assuming something that's not too assymetric, thinning out the acks may not make
any difference in the transfer rate of a single data flow in one direction, but
if you step back and realize that there may be a need to transfer data in the
other direction, things change here.
If you have a fully symmetrical link, and are maxing it out in both direction,
going from 35K PPs of aks competing with data packets and gonig down to 1k PPS
or 100 PPS (or 10 PPS) would result in a noticable improvement in the flow that
the acks are competing against.
Stop thinking in terms of single-flow benchmarks and near idle 'upstream' paths.
David Lang
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