[openib-general] Shared Receive Queue

[Or Gerlitz]

> We have software which uses the mellanox shared receive queue and we
> are seeing a substantial performance penalty (on the order of 4-5
> usec on 0 byte messages).

Are you comparing code that sends short messages either by rdma write
where the 
reciever does polling on memory (as done in some IB MPIs "short message
protocols")
to code that uses send/recv with SRQ --or-- code that does send/recv
where in one run 
the recv is to "non shared" queue (that is regular QP) and in the other
run to SRQ (QP attached to SRQ)?

Or.