On 11/22/2013 07:37 AM, Alex Shi wrote:
The cpu_load decays on time according past cpu load of rq. New sched_avg decays
on tasks' load of time. Now we has 2 kind decay for cpu_load. That is a kind of
redundancy. And increase the system load in sched_tick etc.
This patch trying to remove the cpu_load decay. And fixed a nohz_full bug by
the way.
There are 5 load_idx used for cpu_load in sched_domain. busy_idx and idle_idx
are not zero usually, but newidle_idx, wake_idx and forkexec_idx are all zero
on every arch. A shortcut to remove cpu_Load decay in the first patch. just one
line patch for this change. :)
I have tested the patchset on my pandaES board, 2 cores ARM Cortex A9.
hackbench thread/pipe performance increased nearly 10% with this patchset! That
do surprise me!
latest kernel 527d1511310a89 + this patchset
hackbench -T -g 10 -f 40
23.25" 21.7"
23.16" 19.99"
24.24" 21.53"
hackbench -p -g 10 -f 40
26.52" 22.48"
23.89" 24.00"
25.65" 23.06"
hackbench -P -g 10 -f 40
20.14" 19.37"
19.96" 19.76"
21.76" 21.54"
The git tree for this patchset at:
g...@github.com:alexshi/power-scheduling.git no-load-idx
Since Fengguang had included this tree into his kernel testing system. and I
haven't get a regression report until now. I suppose it is fine for x86 system.
But anyway, since the scheduler change will effect all archs. and hackbench is
only benchmark I found now for this patchset. I'd like to see more testing and
talking on this patchset.
Hi Alex,
I tried on my Xeon server (2 x 4 cores) your patchset and got the
following result:
kernel a5d6e63323fe7799eb0e6 / + patchset
hackbench -T -s 4096 -l 1000 -g 10 -f 40
27.604 38.556
27.397 38.694
26.695 38.647
25.975 38.528
29.586 38.553
25.956 38.331
27.895 38.472
26.874 38.608
26.836 38.341
28.064 38.626
hackbench -p -s 4096 -l 1000 -g 10 -f 40
34.502 35.489
34.551 35.389
34.027 35.664
34.343 35.418
34.570 35.423
34.386 35.466
34.387 35.486
33.869 35.212
34.600 35.465
34.155 35.235
hackbench -P -s 4096 -l 1000 -g 10 -f 40
39.170 38.794
39.108 38.662
39.056 38.946
39.120 38.668
38.896 38.865
39.109 38.803
39.020 38.946
39.099 38.844
38.820 38.872
38.923 39.337
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