Re: CFS review

[Matt Mackall]

On Wed, Aug 01, 2007 at 01:22:29PM +0200, Ingo Molnar wrote:
> 
> * Roman Zippel <zippel@xxxxxxxxxxxxxx> wrote:
> 
> > [...] e.g. in this example there are three tasks that run only for 
> > about 1ms every 3ms, but they get far more time than should have 
> > gotten fairly:
> > 
> >  4544 roman     20   0  1796  520  432 S 32.1  0.4   0:21.08 lt
> >  4545 roman     20   0  1796  344  256 R 32.1  0.3   0:21.07 lt
> >  4546 roman     20   0  1796  344  256 R 31.7  0.3   0:21.07 lt
> >  4547 roman     20   0  1532  272  216 R  3.3  0.2   0:01.94 l
> 
> Mike and me have managed to reproduce similarly looking 'top' output, 
> but it takes some effort: we had to deliberately run a non-TSC 
> sched_clock(), CONFIG_HZ=100, !CONFIG_NO_HZ and !CONFIG_HIGH_RES_TIMERS.

..which is pretty much the state of play for lots of non-x86 hardware.

-- 
Mathematics is the supreme nostalgia of our time.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/