From owner-freebsd-bugs  Wed Mar 10  3:47:45 1999
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To: amagai@nue.org
Cc: freebsd-bugs@FreeBSD.ORG
Subject: Re: kern/10402: times(3) non-decreaseness broken in 4.0
References: <199903100830.AAA80437@freefall.freebsd.org>
From: Anton Berezin <tobez@plab.ku.dk>
Date: 10 Mar 1999 12:47:06 +0100
In-Reply-To: amagai@nue.org's message of Wed, 10 Mar 1999 00:30:02 -0800 (PST)
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amagai@nue.org writes:

> From: amagai@nue.org
> To: freebsd-gnats-submit@freebsd.org, tobez@plab.ku.dk
> Cc:  
> Subject: Re: kern/10402: times(3) non-decreaseness broken in 4.0
> Date: Wed, 10 Mar 1999 17:23:11 +0900 (JST)
> 
>  Dear, I have a same problem.  CPU consumption time is decreased occasionally.
>  Environment: FreeBSD 2.2.8-RELEASE, FreeBSD 3.1-RELEASE

Uh oh.  You have it occasionally.  I have it occasionally on 3.1 and
2.2.8, too.  But I have it consistenly and _very_ often --- in fact,
it is a never-ending stream of y<x output of your test program (btw,
thank you for it - it illustrates the problem _way_ better than my
Perl hack) --- on 4.0.

Why it happens I don't know.  The only seems-to-be-relevant piece of
code that changed in comparison to 3.1 is the global removal of
p_switchtime.  calcru() in /usr/src/sys/kern/kern_resource.c uses now
switchtime instead.

Probably this:

	/usr/src/sys/sys/proc.h
	1.72 Sun Feb 28 10:53:29 1999 UTC by bde

is somehow related to the problem.

-- 
Anton Berezin <tobez@plab.ku.dk>
The Protein Laboratory, University of Copenhagen


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