On Sun, 2007-04-08 at 21:34 +0300, Al Boldi wrote:
> Mike Galbraith wrote:
> > On Sat, 2007-04-07 at 19:17 +0200, Mike Galbraith wrote:
> > > I lowered the time to 500us, and ran at nice -10.. it starves tenpercent
> > > here every time. (ran as taskset -c 1 nice -n -10 ./fairtest) The
> > > starving 10% duty cycle task has trouble getting 1% CPU.
> >
> > Hmm. Playing with it some more today, it still happens, but it's not
> > very repeatable. Something is odd. I wonder if any SD using readers
> > will try it.
>
> Tried it on mainline 2.6.20.3.
> It's not easily repeatable, but it's got the same problem.
>
> top - 21:21:45 up 27 min, 0 users, load average: 0.80, 0.43, 0.20
> Tasks: 45 total, 3 running, 42 sleeping, 0 stopped, 0 zombie
> Cpu(s): 24.3% user, 0.5% system, 0.0% nice, 75.0% idle, 0.2% IO-wait
> Mem: 499488k total, 27352k used, 472136k free, 1996k buffers
> Swap: 1020088k total, 0k used, 1020088k free, 9160k cached
>
> PID PR NI VIRT RES SHR SWAP nFLT nDRT WCHAN S %CPU TIME+ Command
> 688 25 0 1804 412 352 1392 0 0 rest_init R 94.7 2:37.01 fairtest
> 689 15 0 1804 264 204 1540 0 0 rest_init R 0.0 0:00.79 fairtest
Aha! Thanks a bunch for testing it. (thing was irritating me greatly)
-Mike
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