From owner-freebsd-questions Sat Aug 18 20:30:11 2001 Delivered-To: freebsd-questions@freebsd.org Received: from wantadilla.lemis.com (wantadilla.lemis.com [192.109.197.80]) by hub.freebsd.org (Postfix) with ESMTP id 86A1A37B408 for ; Sat, 18 Aug 2001 20:30:07 -0700 (PDT) (envelope-from grog@lemis.com) Received: by wantadilla.lemis.com (Postfix, from userid 1004) id B451E6ACC3; Sun, 19 Aug 2001 13:00:06 +0930 (CST) Date: Sun, 19 Aug 2001 13:00:06 +0930 From: Greg Lehey To: Sean Davis Cc: freebsd-questions@freebsd.org Subject: Re: microuptime() oddness Message-ID: <20010819130006.C35750@wantadilla.lemis.com> References: <20010813032537.A10782@endersgame.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010813032537.A10782@endersgame.net>; from dive-fb@endersgame.net on Mon, Aug 13, 2001 at 03:25:37AM -0400 Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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) > > > 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. 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