Date: Fri, 4 Jun 1999 11:05:21 -0700 (PDT) From: dwhite@pond.net To: freebsd-gnats-submit@freebsd.org Subject: kern/12022: System clock timewarps Message-ID: <19990604180521.CB25A14C01@hub.freebsd.org>
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>Number: 12022 >Category: kern >Synopsis: System clock timewarps >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Jun 4 11:10:01 PDT 1999 >Closed-Date: >Last-Modified: >Originator: Doug White >Release: 3.1-RELEASE and later >Organization: Pacific Crest Networks, Inc. >Environment: FreeBSD squid.pcrest.net 3.1-RELEASE FreeBSD 3.1-RELEASE #1: Mon May 10 23:00:37 PDT 1999 root@squid.pcrest.net:/usr/src/sys/compile/SQUID i386 >Description: The TSC time calibration code appears badly broken. It cannot get a consistent read off the system TSC and miscalculates the CPU clock. Furthermore, it's causing the system clock to run fast at the rate of about 5 minutes/hour. Normally, the TSC should sync to 90000689 or thereabouts. On the problem machine, we have the following values: May 10 19:53:45 myname /kernel: Timecounter "TSC" frequency 84792684 Hz May 10 19:58:23 myname /kernel: Timecounter "TSC" frequency 78478318 Hz May 10 20:04:29 myname /kernel: Timecounter "TSC" frequency 90205024 Hz May 10 20:10:49 squid /kernel: Timecounter "TSC" frequency 82086508 Hz May 10 20:13:09 squid /kernel: Timecounter "TSC" frequency 83890627 Hz May 10 22:50:53 squid /kernel: Timecounter "TSC" frequency 87498832 Hz May 10 22:56:12 squid /kernel.GENERIC: Timecounter "TSC" frequency 79380441 Hz May 10 23:01:42 squid /kernel: Timecounter "TSC" frequency 86596730 Hz May 10 23:03:58 squid /kernel: Timecounter "TSC" frequency 90205040 Hz May 11 19:40:41 squid /kernel: Timecounter "TSC" frequency 82988540 Hz May 11 19:43:37 squid /kernel: Timecounter "TSC" frequency 84792851 Hz May 11 19:46:05 squid /kernel: Timecounter "TSC" frequency 90204971 Hz May 11 12:36:59 squid /kernel: Timecounter "TSC" frequency 87498777 Hz May 11 16:18:42 squid /kernel: Timecounter "TSC" frequency 86596851 Hz May 12 15:54:47 squid /kernel: Timecounter "TSC" frequency 87498803 Hz This machine ran 3.0-RELEASE previously without any such problems. This machine has a custom kernel without APM built in, and I believe APM is disabled in the BIOS (not 100% sure, but this is a server. I've also tried setting kern.timecounter.method=1 with no effect. >How-To-Repeat: . Find a PC. . Boot 3.1 or later on it a few times. . Watch the TSC go nuts. >Fix: >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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