From nobody@FreeBSD.org Tue Nov 13 23:04:05 2001 Return-Path: Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21]) by hub.freebsd.org (Postfix) with ESMTP id 486CA37B41A for ; Tue, 13 Nov 2001 23:02:45 -0800 (PST) Received: (from nobody@localhost) by freefall.freebsd.org (8.11.4/8.11.4) id fAE72jp36017; Tue, 13 Nov 2001 23:02:45 -0800 (PST) (envelope-from nobody) Message-Id: <200111140702.fAE72jp36017@freefall.freebsd.org> Date: Tue, 13 Nov 2001 23:02:45 -0800 (PST) From: Ming Zhang To: freebsd-gnats-submit@FreeBSD.org Subject: microuptime() went backwards when apm is already disabled in the kernel on intel CPU X-Send-Pr-Version: www-1.0 >Number: 31971 >Category: kern >Synopsis: microuptime() went backwards when apm is already disabled in the kernel on intel CPU >Confidential: no >Severity: non-critical >Priority: low >Responsible: phk >State: closed >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Nov 13 23:10:01 PST 2001 >Closed-Date: Tue Jul 29 03:31:02 PDT 2003 >Last-Modified: Tue Jul 29 03:31:02 PDT 2003 >Originator: Ming Zhang >Release: 4.4-Stable >Organization: >Environment: FreeBSD shell.unixbox.com 4.4-STABLE FreeBSD 4.4-STABLE #1: Fri Oct 26 15:56:38 PDT 2001 root@shell.unixbox.com:/usr/src/sys/compile/unixbox i386 >Description: microuptime() went backwards (1569221.6122007 -> 1569220.755141) it happens every other 3-4 days. Machine is a PIII-650Mhz on ASUS CUV 4X APM is already disabled from kernel (never was configured) Never seen this before upgrading to 4.4 >How-To-Repeat: Don't know >Fix: I thought you may know.... >Release-Note: >Audit-Trail: From: David Malone To: Ming Zhang Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: kern/31971: microuptime() went backwards when apm is already disabled in the kernel on intel CPU Date: Wed, 14 Nov 2001 10:41:55 +0000 On Tue, Nov 13, 2001 at 11:02:45PM -0800, Ming Zhang wrote: > >Description: > microuptime() went backwards (1569221.6122007 -> 1569220.755141) > > it happens every other 3-4 days. > > Machine is a PIII-650Mhz on ASUS CUV 4X > APM is already disabled from kernel (never was configured) > > Never seen this before upgrading to 4.4 Can you try running "sysctl kern.timecounter" and see what it outputs. You could try setting kern.timecounter.method to 1 or experimenting with kern.timecounter.hardware (which can probably be set to i8254 or TSC on your hardware). David. From: Ming Zhang To: David Malone Cc: Subject: Re: kern/31971: microuptime() went backwards when apm is already disabled in the kernel on intel CPU Date: Wed, 14 Nov 2001 09:26:23 -0800 (PST) Hi, here it's the output: # sysctl kern.timecounter kern.timecounter.method: 0 kern.timecounter.hardware: TSC I've set kern.timecounter to 1 and will see if that stops the prob. thanks Ming On Wed, 14 Nov 2001, David Malone wrote: > On Tue, Nov 13, 2001 at 11:02:45PM -0800, Ming Zhang wrote: > > >Description: > > microuptime() went backwards (1569221.6122007 -> 1569220.755141) > > > > it happens every other 3-4 days. > > > > Machine is a PIII-650Mhz on ASUS CUV 4X > > APM is already disabled from kernel (never was configured) > > > > Never seen this before upgrading to 4.4 > > Can you try running "sysctl kern.timecounter" and see what it > outputs. You could try setting kern.timecounter.method to 1 or > experimenting with kern.timecounter.hardware (which can probably > be set to i8254 or TSC on your hardware). > > David. > State-Changed-From-To: open->feedback State-Changed-By: iedowse State-Changed-When: Sun Dec 1 12:30:05 PST 2002 State-Changed-Why: Does this still happen on more recent releases? http://www.freebsd.org/cgi/query-pr.cgi?pr=31971 Responsible-Changed-From-To: freebsd-bugs->phk Responsible-Changed-By: kris Responsible-Changed-When: Sat Jul 12 16:21:38 PDT 2003 Responsible-Changed-Why: phk is Mr Timekeeping http://www.freebsd.org/cgi/query-pr.cgi?pr=31971 State-Changed-From-To: feedback->closed State-Changed-By: phk State-Changed-When: Tue Jul 29 03:30:50 PDT 2003 State-Changed-Why: timed out. http://www.freebsd.org/cgi/query-pr.cgi?pr=31971 >Unformatted: