[openib-general] uverbs performance; ibv_pingpong poll vs sleep

[Steven Wooding]

Thanks. I'll  give pipeling ago in my app.
 
Cheers,
 
Steve.


 
Roland Dreier <roland at topspin.com> wrote:
Steven> I have compaired the data rates using ibv_pingpong with
Steven> and without the -e option. Therefore, using polling and
Steven> waiting the CQ events (sleeping).

Steven> Is there any way to trade off the data rate with the CPU
Steven> usage (I was thinking of some timeout from polling).

I suppose you could have some sort of adaptive polling scheme that
spins polling for a while and then sleeps waiting for an event.
However, as Michael said, it's probably better to use pipelining and
post multiple send work requests. This hides the latency of getting a
completion event by keeping the HCA busy.

- R.

 

		
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