This will poll CQ before going to sleep. You can try tuning this module option if you like - but from I saw the defaults are generally OK.
Quoting SEGERS Koen <[EMAIL PROTECTED]>: Subject: RE: [ofa-general] Re: why is CPU util/service demand so much higher withSDP than TCP? Can you give more information on what this recv_poll module does? We are not interested in latency, but in throughput. Do we need to change this module for this setup? Regards, Koen ________________________________ Van: [EMAIL PROTECTED] namens Michael S. Tsirkin Verzonden: vr 27/04/2007 6:23 Aan: Rick Jones CC: [email protected] Onderwerp: [ofa-general] Re: why is CPU util/service demand so much higher withSDP than TCP? > 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 *** Disclaimer *** Vlaamse Radio- en Televisieomroep Auguste Reyerslaan 52, 1043 Brussel nv van publiek recht BTW BE 0244.142.664 RPR Brussel http://www.vrt.be/disclaimer -- 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
