ULE Interactivity perf patch

[Jeff Roberson]

On Fri, 19 Dec 2003, Peter Schultz wrote:

> Jeff Roberson wrote:
> > I realized a pitfal in the way that I'm doing slice assignment for
> > interactive tasks.  I'd like to have as many people test this as possible,
> > in case there are unintended consequences.  What this patch does is allow
> > interactive tasks to have longer time-slices so that they may be more
> > efficient.
> >
> > This patch is intended to fix the poor performance of some interactive
> > processes while under high load, especially high load with other
> > interactive tasks present.
> >
> > http://www.chesapeake.net/~jroberson/interact.diff
> >
> On this dual PII 350 box `make -j 11 buildworld', playing an mp3 with
> xmms and unarchiving two separate mozilla distros can cause quite an
> interactivity problem.  At a more moderate system load things are quite
> usable.  It's still not BeOS, but BeOS never had the kind of i/o that
> FreeBSD has, so I think things are going fairly well.

Do these comments apply to ULE with and without the patch?  Is there any
difference?  I suspect that your interactivity problems in this situation
are more due to disk and memory pressure.  If you were to fire up vi, or a
shell, something that's totally memory resident, do they suffer any lag?
Also, how well does 4BSD do in this same test?

Thanks!
Jeff

>
> Pete...
>