Re: [patch] sched: disable task group re-weighting on the desktop
From: Peter Zijlstra
Date: Sat Oct 10 2015 - 13:13:59 EST
On Sat, Oct 10, 2015 at 07:01:42PM +0200, Peter Zijlstra wrote:
> On Sat, Oct 10, 2015 at 03:22:49PM +0200, Mike Galbraith wrote:
> > Ah, but now onward to interactivity...
> >
> > master, 8 groups of 1 (pert) vs desktop (mplayer BigBuckBunny-DivXPlusHD.mkv)
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
> > 4068 root 20 0 8312 724 628 R 99.64 0.004 1:04.32 6 pert
> > 4065 root 20 0 8312 744 648 R 99.45 0.005 1:04.92 5 pert
> > 4071 root 20 0 8312 748 652 R 99.27 0.005 1:03.12 7 pert
> > 4077 root 20 0 8312 840 744 R 98.72 0.005 1:01.46 3 pert
> > 4074 root 20 0 8312 796 700 R 98.18 0.005 1:03.38 1 pert
> > 4079 root 20 0 8312 720 624 R 97.99 0.004 1:01.45 4 pert
> > 4062 root 20 0 8312 836 740 R 96.72 0.005 1:03.44 0 pert
> > 4059 root 20 0 8312 720 624 R 94.16 0.004 1:04.92 2 pert
> > 4082 root 20 0 1094400 154324 33592 S 4.197 0.954 0:02.69 0 mplayer
> > 1029 root 20 0 465332 151540 40816 R 3.285 0.937 0:24.59 2 Xorg
> > 1773 root 20 0 662592 73308 42012 S 2.007 0.453 0:12.84 5 konsole
> > 771 root 20 0 11416 1964 1824 S 0.730 0.012 0:10.45 0 rngd
> > 1722 root 20 0 2866772 65224 51152 S 0.365 0.403 0:03.44 2 kwin
> > 1769 root 20 0 711684 54212 38020 S 0.182 0.335 0:00.39 1 kmix
Ah wait, so you have 8 groups of cycle soakers vs 1 group of desktop?
That means your desktop will get 1/9 th of the total time and that is
almost so:
2.69+24.59+12.84+10.45+3.44+.39 = 54.4
vs
(64.32+64.92+63.12+61.46+63.38+61.45+63.44+64.92)/8 = 63.37625
Which isn't too far off.
This really appears to be a case where you get what you ask for.
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