From: utzoo!decvax!cca!chris.umcp-cs@Udel-Relay@sri-unix
Newsgroups: net.unix-wizards
Title: Re:  automatic niceing by kernel
Article-I.D.: sri-unix.4205
Posted: Fri Nov 19 04:01:44 1982
Received: Sat Nov 20 08:58:56 1982

From:     Chris Torek <chris.umcp-cs@Udel-Relay>
Date:     15 Nov 82 01:46:31 EST  (Mon)
That's in "clock.c".  If CPU usage goes too high, and the process
isn't owned by UID 0, and the processes current nice is 0, it gets
put at four.  Interestingly, you can always "renice" it to one, and
it stays there.  (We have a modified renice here that lets anyone
renice his own processes to nonnegative values.)