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SubjectRe: [PATCH] Minor scheduler fix to get rid of skipping in xmms
Andrew Morton wrote:

>That is not clear at this time. We do know that the reaim regression was
>introduced by sched-2.6.0-test2-mm2-A3, but we don't know why. Certainly
>that patch did not introduce the problem which Andrew's patch fixed. And
>we have theorised that Andrew's patch brought back the reaim throughput.
>And we have extrapolated those observations to possible improvements in
>volanomark throughput.
>
>It's all foggy and I'd like to see a clean rerun of specjbb and volanomark
>by Mark Peloquin and co, confirming that -mm6 is performing OK.
>
>
For specjbb things are looking good from a throughput point of view.




2.6.0-test4 2.6.0-test4-mm6
# of WHs OPs/sec OPs/sec %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 9783.46 10093.09 3.16 309.63 293.50 *
4 33783.93 35763.79 5.86 1979.86 1013.52 *
7 54401.52 54288.06 -0.21 -113.46 1632.05
10 56861.59 56445.20 -0.73 -416.39 1705.85
13 56024.86 55720.23 -0.54 -304.63 1680.75
16 43874.77 48994.63 11.67 5119.86 1316.24 *
19 32658.83 31248.04 -4.32 -1410.79 979.76 *

But to get these numbers we are using much more CPU. I'll leave it to
others to decide if this is good or not.

CPU IDLE TIME
2.6.0-test4 2.6.0-test4-mm6
# of WHs %CPU %CPU %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 87.30 87.31 0.01 0.01 3.62
4 49.53 49.51 -0.04 -0.02 2.49
7 12.40 12.32 -0.65 -0.08 1.37
10 0.36 0.40 11.11 0.04 1.01
13 1.20 0.62 -48.33 -0.58 1.04
16 15.17 2.79 -81.61 -12.38 1.46 *
19 30.66 5.29 -82.75 -25.37 1.92 *


Volanomark, on the other hand is still off by quite a bit from test4 stock

Results:Throughput

tolerance = 0.00 + 3.00% of 2.6.0-test4
2.6.0-test4 2.6.0-test4-mm6
Msgs/sec Msgs/sec %diff diff tolerance
---------- ------------ ------------ -------- ------------ ------------
1 40757 37223 -8.67 -3534.00 1222.71 *


>
>Also, I'm concerned that sched-2.6.0-test2-mm2-A3 caused slowdowns and
>Andrew's patch caused speedups and they just cancelled out. Let's get
>Andrew's patch into Linus's tree and see if it speeds things up. If it
>does, we probably still have a problem.
>

If thre is any particular patch/tree combination you would like me to
try out, please let me know and I will see if I can get the results for
you.

Steve

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