Re: 2.5.68-mm2

From: Martin J. Bligh (mbligh@aracnet.com)
Date: Thu Apr 24 2003 - 16:13:25 EST


>> The performance improvement was about 25% of systime according to my
>> measurements - I don't call that insignificant.
>
> Never, ever use changes in system time as a justification for a patch. We
> all know that Linux's user/system time accounting is patently unreliable.

Mmmm. I'm not particularly convinced by that ... I do 5 runs for every
benchmark and compare the results, and it seems very consistent to me.
For kernbench, it's interesting to look at system time - but obviously
keeping an eye on elapsed time as well, particularly for things like
scheduler patches.

> Remember Nyquist? Talk to me about differences in wall clock and your
> comments will be more interesting.

OK, well then you need to look at something that's not totally dominated
by gcc anyway. I know everyone hates SDET as it's "closed" but I'll try
to rerun with aim7 at some point. A real 20% improvement in throughput
is not to be sniffed at ...

DISCLAIMER: SPEC(tm) and the benchmark name SDET(tm) are registered
trademarks of the Standard Performance Evaluation Corporation. This
benchmarking was performed for research purposes only, and the run results
are non-compliant and not-comparable with any published results.

Results are shown as percentages of the first set displayed

SDET 1 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 0.7%
           2.5.68-objrmap 105.7% 0.4%

SDET 2 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 2.8%
           2.5.68-objrmap 108.2% 0.7%

SDET 4 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 1.0%
           2.5.68-objrmap 112.0% 1.4%

SDET 8 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 0.6%
           2.5.68-objrmap 122.8% 1.3%

SDET 16 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 0.1%
           2.5.68-objrmap 117.3% 0.8%

SDET 32 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 0.4%
           2.5.68-objrmap 118.5% 0.4%

SDET 64 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 0.2%
           2.5.68-objrmap 121.2% 0.3%

SDET 128 (see disclaimer)
                           Throughput Std. Dev
                   2.5.68 100.0% 0.1%
           2.5.68-objrmap 118.6% 0.2%

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