Date: Sat, 18 Aug 2001 20:42:29 -0700 (PDT) From: Mario Doria <mariodoria@yahoo.com> To: Greg Lehey <grog@FreeBSD.org>, Sean Davis <dive-fb@endersgame.net> Cc: freebsd-questions@freebsd.org Subject: Re: microuptime() oddness Message-ID: <20010819034229.47195.qmail@web14203.mail.yahoo.com> In-Reply-To: <20010819130006.C35750@wantadilla.lemis.com>
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--- Greg Lehey <grog@FreeBSD.org> wrote: > On Monday, 13 August 2001 at 3:25:37 -0400, Sean Davis wrote: > > Hello, I have a machine (AMD Athlon 1.2ghz, 256MB ram) running > > FreeBSD-stable, and have been noticing a lot of weird kernel debug > messages > > like: > > > > microuptime() went backwards (7467.677311 -> 7467.-694689197) > > microuptime() went backwards (7718.041075 -> 7718.-695325418) > > calcru: negative time of -1984434482 usec for pid 365 (setiathome) > > calcru: negative time of -1984434287 usec for pid 365 (setiathome) > > calcru: negative time of -1984434107 usec for pid 365 (setiathome) > > calcru: negative time of -1984433927 usec for pid 365 (setiathome) > > <repeat many, many times> > > > > Does anyone have any idea whats causing this? > > It's a bug which seems to be triggered by something to do with AMD > processors, though we're not sure whether it's the processor or (more > likely) the BIOS. If you disable APM, it should go away. I have > four > AMD processors here, and they all showed it with APM enabled. I got the same results on a Celeron @ 500MHZ on a ThinkPad A20m Laptop. I had installed XFree86-4.1 and KDE2. When I was changing my default fixed width font, XFree would crash and I would be back at the console with lots of messages like "microuptime went backwards" and then how much it went backwards. This happened also with XFree 4.0.3 and on two fresh installs. I don't remember if it had apm enabled, I think it did. Sorry I cannot give more details, but that machine right now is with IBM because of hard disk problems. > > Greg > -- > When replying to this message, please copy the original recipients. > If you don't, I may ignore the reply. > For more information, see http://www.lemis.com/questions.html > See complete headers for address and phone numbers > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message Mario Doria __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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