From owner-freebsd-hackers  Fri Oct 25 11:56:54 1996
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To: csubl@csv.warwick.ac.uk (Mr M P Searle)
cc: hackers@freebsd.org
Subject: Re: Priorities? 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Fri, 25 Oct 1996 11:57:42 -0700
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>The rtprio priorities are "hard" and processes running at rtprio
>are not swapped and always run before normal processes.  "Nice"
>priorities only bias the scheduler.
>
>I sometimes play with audio processing, and find that when running
>X that the system doesn't give enough CPU to processes when moving
>windows around, etc.  Setting the audio processing process with rtprio
>makes the problems totally go away.

   Also, idprio and rtprio are escentially opposites. idprio processes only
run if nothing else is runnable.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project