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.
Linus
-
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/
This archive was generated by hypermail 2b29 : Sat Jul 15 2000 - 21:00:16 EST