Re: 2.5.68-mm2

[Martin J. Bligh]

>> 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%