----- Original Message -----
A newbie question about InfiniBand: while running an RDMA bandwidth
test I noticed that the RDMA communication occupied 99% CPU time,
which is much more than I expected for InfiniBand. Is this normal or
should I check my setup ?
How the test was run:
(host 1) ib_rdma_bw -s 104857600
(host 2) time ib_rdma_bw -s 104857600 192.168.64.7
I think it's normal, I see the same behavior here.
If you take a look at ib_rdma_bw code, you can see that the program waits in
a while() loop, polling the CQ for the WC to appear.
I think it's coded that way to get the WC as soon as possible and report a
more precise time (that is used after to compute BW).
If you don't want that behavior in your application you could use event
notification for the CQ.
Regards,
Diego
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