Combined performance patches update for 2.4.19
From: Rik van Riel <[email protected]>
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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".
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Maybe the histogram mode of irman might show something useful ?
(then again, maybe it doesn't ... haven't tried yet)
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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