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From: lindsay@gandalf.cs.cmu.edu (Donald Lindsay)
Newsgroups: comp.arch
Subject: Re: Letterman's top ten (was re: UNIX)
Message-ID: <11119@pt.cs.cmu.edu>
Date: 16 Nov 90 04:30:53 GMT
References: <4876@trantor.harris-atd.com> <11635@hubcap.clemson.edu>
Organization: Carnegie-Mellon University, CS/RI
Lines: 11

In article <11635@hubcap.clemson.edu> mark@hubcap.clemson.edu 
	(Mark Smotherman) writes:
>   (Ever thought of floating-point expression evaluation as being a
>   critical section in need of interrupt disabling???)

Sure. The LSI 11/23 treated slow ops (like floating point) as
restartable. Since some ops took a lot of microseconds (50?), a few
thousand interrrupts/second could stop the user program in its
tracks.
-- 
Don		D.C.Lindsay