Linus Torvalds writes:
>
> On Wed, 12 Jul 2000, Richard Gooch wrote:
>
> > Linus Torvalds writes:
> > >
> > > Heh.
> > >
> > > This was actually almost certainly due to a _really_ simple improvement.
> > >
> > > As of test4-pre4, the default time-slice for a normal process is just
> > > 50ms, while it used to be 200ms.
> > >
> > > 200ms is way too long a timeslice when working with interactive things:
> > > it's easily noticeable. 50ms should be much better.
> >
> > So is the number of ticks (5 now?) now decoupled from the
> > goodness/dynamic priority level?
>
> Yes.
>
> If people wondered why the "->priority" -> "->nice" change was done, now
> you know. "->priority" used to be a tick-based nice level, and it just
> wasn't able to handle UNIX semantics when the resolution of ticks dropped
> to just a few ticks.
>
> Simple vulcan mind-trick. Switch them around, and instead of
> calculating "nice" from the number of ticks, we calculate ticks from
> the virtual nice value, making the problem go away and allowing for
> a shorter timeslice without having to do major surgery.
Er, so how many ticks do a nice 10 and a nice 11 process get,
respectively?
Regards,
Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca
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