From owner-freebsd-questions Thu Oct 25 14:41:45 2001 Delivered-To: freebsd-questions@freebsd.org Received: from smtp3.mx.pitdc1.stargate.net (smtp3.mx.pitdc1.stargate.net [206.210.69.143]) by hub.freebsd.org (Postfix) with SMTP id 7AA0937B447 for ; Thu, 25 Oct 2001 14:41:31 -0700 (PDT) Received: (qmail 15615 invoked from network); 25 Oct 2001 21:41:24 -0000 Received: from unknown (HELO wastegate.net) (209.166.136.248) by smtp3.mx.pitdc1.stargate.net with SMTP; 25 Oct 2001 21:41:24 -0000 Received: (qmail 7610 invoked from network); 25 Oct 2001 21:41:23 -0000 Received: from unknown (HELO MOTHER) (192.168.1.2) by 192.168.1.1 with SMTP; 25 Oct 2001 21:41:23 -0000 From: "Doug Reynolds" To: "questions@FreeBSD.ORG" , "Randy Pratt" Date: Thu, 25 Oct 2001 17:40:13 -0400 Reply-To: "Doug Reynolds" X-Mailer: PMMail 98 Professional (2.01.1600) For Windows NT (5.0.2195) MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: Re: microuptime and kern.timecounter.method Message-Id: <20011025214131.7AA0937B447@hub.freebsd.org> 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 Tue, 23 Oct 2001 14:52:48 -0400, Randy Pratt wrote: >I resurrected my old 486DX2-66V for some lightweight server duties and >installed 4.4-RELEASE. I would see the occasional message like: > > microuptime() went backwards (345.292246 -> 345.-695042607) > >The archives suggested recompiling the kernel to remove the apm option. That >did not seem to do the trick. However, another post suggested: > > sysctl kern.timecounter.method=1 > >So far, things seem to be stable with no microuptime() messages (20 hrs). >Now I'm searching for more information on what this accomplished and what >other options are available for the kern.timecounter.method. The man page >for sysctl didn't reference this variable. basically the kernel pulls the time from either the bios or the realtime clock.. I can't remember which. basically one of them is a _lot_ more accurate. the timecounter just uses a different src if i am corrent --- doug reynolds | the maverick | mav@wastegate.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message