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SubjectRe: Combined performance patches update for 2.4.19
From: Rik van Riel <riel@conectiva.com.br>

[...]
> > Maybe I can find the time to run a few tests, can anyone suggest me an
> > "intersting" test?
>
> Bob Matthews has a benchmark called irman, which tries to measure
> response time during a number of background loads.
>
> I'm not sure it is too interesting in this case, though. People
> don't really care about the exact latency of sub-millisecond
> responses (should be the vast majority) but about the few times
> per minute where their mp3 skips.
>
> Simple averages won't show the mp3 skips, because the number of
> fast responses are bound to be hundreds of thousands of times
> more common then the "mp3 skipping hickups".
>
> Maybe the histogram mode of irman might show something useful ?
>
> (then again, maybe it doesn't ... haven't tried yet)
>
> http://people.redhat.com/bmatthews/irman/
Well... I tried irman, and here it goes the results:

Test: NULL
Kernel max min avg stddev
2.4.18 45.955 0.004 0.005 0.061
2.4.18-0.24pre3 0.121 0.005 0.005 0.001
2.4.19 1.683 0.005 0.005 0.002
2.4.19-ck3 1.694 0.005 0.005 0.002
2.4.19-ck3-aa 0.200 0.005 0.005 0.001
2.4.19-ck3-rmap 1.628 0.005 0.005 0.002
2.5.31 1.636 0.006 0.007 0.002

Test: MEMORY
Kernel max min avg stddev
2.4.18 69.471 0.005 0.010 0.554
2.4.18-0.24pre3 70.031 0.005 0.010 0.546
2.4.19 60.058 0.005 0.011 0.558
2.4.19-ck3 150.216 0.005 0.009 0.720
2.4.19-ck3-aa 150.075 0.005 0.008 0.621
2.4.19-ck3-rmap 150.059 0.005 0.009 0.674
2.5.31 1.823 0.005 0.007 0.002

Test: FILE_IO
Kernel max min avg stddev
2.4.18 190.042 0.005 0.019 1.452
2.4.18-0.24pre3 325.509 0.005 0.017 1.379
2.4.19 190.033 0.005 0.022 1.525
2.4.19-ck3 1050.048 0.005 0.015 2.196
2.4.19-ck3-aa 1363.153 0.005 0.014 2.177
2.4.19-ck3-rmap 450.073 0.005 0.016 2.097
2.5.31 610.021 0.006 0.019 2.314

Test: PROCESS
Kernel max min avg stddev
2.4.18 350.056 0.005 0.068 2.548
2.4.18-0.24pre3 270.138 0.005 0.068 2.439
2.4.19 270.238 0.005 0.075 2.594
2.4.19-ck3 1710.017 0.005 0.022 4.293
2.4.19-ck3-aa 1620.023 0.005 0.023 4.298
2.4.19-ck3-rmap 1630.020 0.005 0.025 4.724
2.5.31 1171.021 0.006 0.026 4.354

Ciao,
Paolo
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