> Quoting Rick Jones <[EMAIL PROTECTED]>: > Subject: why is CPU util/service demand so much higher with SDP than TCP? > > So, while playing around with my new netperf SDP_RR test I've noticed that > a single-byte _RR test over SDP has a much higher transactions per second > (ie lower latency) than over TCP over the same HCA, but the CPU utilization > is _very_ much higher and the service demand (cpu per transaction) as well. > CPU util being higher makes sense with a higher transaction rate, but not > the increased service demand - well at least not to my experience thusfar.
That's expected. SDP by default uses polling aggressively to trade off service demand for latency. You can play with recv_poll module parameter to tune that. -- MST _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
