Date: Wed, 2 Apr 2003 21:48:37 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Sheldon Hearn <sheldonh@starjuice.net> Cc: current@freebsd.org Subject: Re: ULE nice behavior fixed. Message-ID: <20030402212503.N26453@gamplex.bde.org> In-Reply-To: <20030402091300.GG725@starjuice.net> References: <20030402015226.E64602-100000@mail.chesapeake.net> <20030402091300.GG725@starjuice.net>
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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
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