Quoting r. Grant Grundler <[EMAIL PROTECTED]>: > Subject: Re: Re: [PATCH] (fixed) reduce qp locking on cq poll > > On Wed, Jan 26, 2005 at 10:13:22PM +0200, Michael S. Tsirkin wrote: > > Its not the speed of hardware, my problem is the variations. > > Ok. Your "log comment" was entirely misleading. It should read > I can't measure a performance difference becuase of my > test results vary by X%. > > Substitute the right value for X. > > > > Did you see the difference in IPoIB numbers that I posted > > > earlier where I pegged the test processes to the same CPU > > > taking interrupts or a different CPU? > > > > No - link? > > Sorry - I don't have the URL - just the original mail. > I posted this on "Date: Thu, 13 Jan 2005 10:43:34 -0800" > and you should be able to find this in the archives. > > Here is the table again: > netperf/irq same, netserver/irq same: 1591 Mbps > netperf/irq diff, netserver/irq same: 1565 Mbps > netperf/irq same, netserver/irq diff: 1507 Mbps > netperf/irq diff, netserver/irq diff: 1510 Mbps > > (1591-1510)/1510 is about 5%. > If you use taskset on your platforms, run a similar table to the > above, we could compare and see if ia64 is more sensitive to this > than other arches. > > hth, > grant >
I finally found some time to do this. taskset does not seem to help: swlab155:~ # taskset 1 netperf -f M -c -C -H 11.4.8.156 -- -m 100000 TCP STREAM TEST to 11.4.8.156 Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. MBytes /s % S % S us/KB us/KB 87380 16384 100000 10.00 301.38 44.20 92.95 2.865 6.024 swlab155:~ # taskset 1 netperf -f M -c -C -H 11.4.8.156 -- -m 100000 TCP STREAM TEST to 11.4.8.156 Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. MBytes /s % S % S us/KB us/KB 87380 16384 100000 10.00 290.86 47.80 89.85 3.210 6.033 swlab155:~ # taskset 1 netperf -f M -c -C -H 11.4.8.156 -- -m 100000 TCP STREAM TEST to 11.4.8.156 Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. MBytes /s % S % S us/KB us/KB 87380 16384 100000 10.00 295.07 43.46 90.45 2.876 5.987 Bandwidth went anywhere from 301.38 to 295.07. -- MST - Michael S. Tsirkin _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
