Re: I like SCHED_4BSD

On Thu, 11 Mar 2004, Ian FREISLICH wrote:

> > > o Better interactivity -- No mouse jerkiness, no sluggish screen updates =
> > when
> > >   switching between virtual desktops, etc.
> > >=20
> > > o Better scheduling!  I'm serious here.  Watching top under SCHED_ULE, I'm
> > >   seeing 10, 15, 20 seconds go by where ALL processes are sleeping.=20
> > >   Processes seem to be spending inordinate amounts of time in the "kserel"
> > >   state.  This, of course, doesn't happen with SCHED_4BSD.
> > 
> > That this observation may well be bogus, because you're trying to
> > measure the scheduler using a tool that is itself run by the
> > scheduler, so the process stats you see may not be representative of
> > what is really happening on your system.
> 
> That point is taken, however, on my old SMP box _ULE adds an extra
> ~5000 seconds of wall clock time to a 'make buildworld -j8' compared
> to _BSD 'make world -j8'.
> 
> I did some tests about 3 weeks ago using bind-dlz and postgresql-7.4.1
> on this same machine trying libc_r and libkse using both schedulers.
> ULE results with either thread library were dismal ~.33 that of
> BSD: ULE gave about 17 authoritive lookups a second with BSD giving
> about 50.  The KSE library only dropped the rate by about 2 lookups
> per second on both schedulers which is essentially noise, but I had
> expected an improvement.

Re: KSE....
We have not yet begun to fight^H^H^H^H^Hoptimise
see what happens if you disable the halt on idle 
sysctl machdep.cpu_idle_hlt=0
The machine will get hotter but it may affect the outcome..
Just curious.