Date: Fri, 10 Feb 2006 12:13:43 -0800 From: Julian Elischer <julian@elischer.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, current@freebsd.org Subject: Re: [TEST/REVIEW] cpu time accounting patch, step 2 Message-ID: <43ECF3F7.5010008@elischer.org> In-Reply-To: <17388.60202.862312.337026@grasshopper.cs.duke.edu> References: <17388.44976.250463.383429@grasshopper.cs.duke.edu> <5383.1139586916@critter.freebsd.dk> <17388.60202.862312.337026@grasshopper.cs.duke.edu>
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Andrew Gallatin wrote: >Poul-Henning Kamp writes: > > In message <17388.44976.250463.383429@grasshopper.cs.duke.edu>, Andrew Gallatin > > writes: > > > > >Here are some benchmark results from my "AMD Athlon(tm) 64 X2 Dual > > >Core Processor 3800+" running an SMP kernel for both loopback and > > >10GbE TCP networks. The executive summary is that there's a 41% > > >improvement in loopback pingpong, and a 12.5% improvement in a > > >pingpong test with a remote linux machine over 10GbE. Since the linux > > >machine isn't infinately fast, the improvement is probably a bit more > > >than 12.5% ;) > > > > That's a LOT more than I had hoped for... > >Unfortunately, even after your patch, we are still about 38% slower >than linux x86_64 on the same box for loopback ping-pong, and 32% >slower for ping-pong over 10GbE. (bandwidth is lower for streaming >tests, and CPU utilization is much, much much higher in FreeBSD as >well). > >I think you nailed the biggest source of overhead, but there is >apparently a lot more performance that we can get out of the hardware. >I'd love to see you commit this. > > robert watson has a change that apparently helps with loopback times. >Drew > >x loopback_rr.after >+ loopback_rr.rhel4 >+--------------------------------------------------------------------------+ >| x + | >|x x xx + ++ +| >| |_MA__| |_AM_|| >+--------------------------------------------------------------------------+ > N Min Max Median Avg Stddev >x 5 38590.71 40167.44 39301.22 39463.23 645.1375 >+ 5 53349.28 54884.98 54388.49 54274.174 566.90395 >Difference at 95.0% confidence > 14810.9 +/- 885.686 > 37.531% +/- 2.24433% > (Student's t, pooled s = 607.282) > > >x 10GbE_rr.after >+ 10GbE_rr.rhel4 >+--------------------------------------------------------------------------+ >| x + | >|xxx + + + +| >| AM |___A_M_|| >+--------------------------------------------------------------------------+ > N Min Max Median Avg Stddev >x 6 33323.05 33703.95 33614.14 33556.268 137.33838 >+ 5 43448.3 44966.41 44610.41 44331.738 606.53307 >Difference at 95.0% confidence > 10775.5 +/- 571.321 > 32.1116% +/- 1.70258% > (Student's t, pooled s = 417.112) >_______________________________________________ >freebsd-current@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-current >To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > >
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