Re: [PATCH] small scheduling optimization
Richard Gooch (rgooch@atnf.csiro.au)
Wed, 14 Apr 1999 00:46:19 +1000
Rik van Riel writes:
> On Tue, 13 Apr 1999, Ingo Molnar wrote:
> > On Sun, 11 Apr 1999, Rik van Riel wrote:
> >
> > > This second patch is just a small optimization to the code calling
> > > the scheduling code. With a program like rc5des running (nice +19)
> > > in the background and NOTHING in the foreground Linux still goes
> > > through the scheduler 50 times a second!
> >
> > hm, it should only go 5 times a second into the scheduler if this is
> > the only process running. Are you sure that it's 50 times a second?
>
> A nice +19 process only has a timeslice of 10 (20 if it's
> alone) milliseconds. That will give 50 reschedules and a
> lot of cache corruption per second...
Erm, a lone process will get a timeslice of 20 *ticks*, not 20
milliseconds. So that's 200 millisecond timeslices, which is 5 times
per second.
Regards,
Richard....
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/