From owner-freebsd-current@FreeBSD.ORG  Wed Apr  2 03:48:53 2003
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Date: Wed, 2 Apr 2003 21:48:37 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Sheldon Hearn <sheldonh@starjuice.net>
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 <20030402091300.GG725@starjuice.net>
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cc: Jeff Roberson <jroberson@chesapeake.net>
cc: current@freebsd.org
Subject: Re: ULE nice behavior fixed.
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On Wed, 2 Apr 2003, Sheldon Hearn wrote:

> On (2003/04/02 01:54), Jeff Roberson wrote:
>
> > It probably still needs some tweaking but it seems to be MUCH better now.
> > New algorithm entirely.
> >
> > nice +20 processes will not run if anything else wants to.
>
> Some of us have been waiting for that behaviour for a long time (long
> before you started working on ULE).

Er, this is the normal behaviour in FreeBSD-3.0 through FreeBSD-4.8,
so you shouldn't have waited more than negative 4 years for it :-).
The strict implementation of this behaviour in these releases causes
priority inversion problems, but the problems apparently aren't very
important.  The scaling of niceness was re-broken in -current about 3
years ago to "fix" the priority inversion problems.  This is with
SCHED_4BSD.  SCHED_ULE has larger problems.

Bruce