From owner-freebsd-current  Thu Aug 20 19:01:47 1998
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From: Kevin Day <toasty@home.dragondata.com>
Message-Id: <199808210158.UAA01630@home.dragondata.com>
Subject: Re: 13 months of user time?
In-Reply-To: <199808210140.LAA11972@godzilla.zeta.org.au> from Bruce Evans at "Aug 21, 98 11:40:39 am"
To: bde@zeta.org.au (Bruce Evans)
Date: Thu, 20 Aug 1998 20:58:48 -0500 (CDT)
Cc: brian@Awfulhak.org, green@unixhelp.org, bde@zeta.org.au,
        freebsd-current@FreeBSD.ORG, jwd@unx.sas.com, phk@critter.freebsd.dk,
        tlambert@primenet.com
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> >I reckon a diagnostic in microuptime() that compares the value 
> >assigned to *tv with the previous value and moans if they decrease 
> >may prove informative.... and maybe a similar thing in 
> >i8254_get_timecount() - the machine I was having problems with was 
> >running apm, so it used the i8254 timecounter rather than the tsc 
> >counter.
> 
> The problem is quite likely to be with apm.  It does bad things to
> reinitialize the time.  Damage is limited by not reinitializing the
> time unless apm has apparently been asleep for > 2 seconds (or < -2
> seconds :-).
> 
> Bruce

FWIW, I've got a Cyrix MediaGX system that does this, has APM turned off,
and continually complains: 

calcru: negative time -7747 ms

(or whatever the message is).

It's usually 2 to 10 seconds at a time when it does it.

Kevin

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