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Date:      Fri, 8 Sep 2000 15:06:20 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Mike Smith <msmith@FreeBSD.ORG>
Cc:        Kenneth Wayne Culver <culverk@wam.umd.edu>, John Baldwin <jhb@pike.osd.bsdi.com>, Steve Ames <steve@virtual-voodoo.com>, freebsd-current@FreeBSD.ORG
Subject:   Re: microuptime() went backwards
Message-ID:  <20000908150620.Y83632@wantadilla.lemis.com>
In-Reply-To: <200009080543.WAA01815@mass.osd.bsdi.com>; from msmith@FreeBSD.ORG on Thu, Sep 07, 2000 at 10:43:11PM -0700
References:  <20000908135433.V83632@wantadilla.lemis.com> <200009080543.WAA01815@mass.osd.bsdi.com>

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On Thursday,  7 September 2000 at 22:43:11 -0700, Mike Smith wrote:
>>> Sep  7 14:35:55 laptop /kernel: microuptime() went backwards (10412.355980 -> 10412, -694583121)y
>>>
>>> this is bad.. right ? :-)
>>
>> Well, at any rate it looks very funny.  If this is a laptop, try
>> building a kernel without apm and see if that helps.
>
> It only helps "hide" the problem.  There's either *extremely* bogus data
> coming in, or an arithmetic or sequencing error that's allowing a corrupt
> timecounter to be seen.

Correct.  As I mentioned earlier in the thread, phk has an idea what
the problem is, and he's asked for people with it to contact him.

Greg
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