Date: Fri, 10 Feb 2006 14:36:10 -0500 (EST) From: Andrew Gallatin <gallatin@cs.duke.edu> To: "Poul-Henning Kamp" <phk@phk.freebsd.dk> Cc: current@freebsd.org Subject: Re: [TEST/REVIEW] cpu time accounting patch, step 2 Message-ID: <17388.60202.862312.337026@grasshopper.cs.duke.edu> In-Reply-To: <5383.1139586916@critter.freebsd.dk> References: <17388.44976.250463.383429@grasshopper.cs.duke.edu> <5383.1139586916@critter.freebsd.dk>
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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.
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)
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