i386/123462: clock is to fast

[Rene Maroufi]

The following reply was made to PR i386/123462; it has been noted by GNATS.

From: Rene Maroufi <info at maroufi.net>
To: Bruce Cran <bruce at cran.org.uk>
Cc: bug-followup at FreeBSD.org
Subject: Re: i386/123462: clock is to fast
Date: Fri, 9 May 2008 10:48:21 +0200

 On Thu, May 08, 2008 at 10:20:33AM +0100, Bruce Cran wrote:
 > The ACPI-safe timecounter doesn't work on some systems, and you need to 
 > tell FreeBSD to use one of the other time sources. Could you try 
 > enabling the i8254 by putting the following in /etc/sysctl.conf and 
 > rebooting:
 > 
 > kern.timecounter.hardware=i8254
 > 
 > If that doesn't work you might want to try using the TSC instead.
 
 I tested it with kern.timecounter=i8254 and with kern.timecounter=TSC,
 but both are to fast to. It's not extreme like with acpi, but both to
 fast to. Both are 1 or 2 Seconds to fast per Minute:
 ntpdate ntp
  9 May 10:26:57 ntpdate[776]: step time server 192.168.0.20 offset
  -0.690100 sec
 
 ntpdate ntp
  9 May 10:36:08 ntpdate[801]: step time server 192.168.0.20 offset
  -9.297237 sec
 
 sysctl kern.timecounter.hardware
 kern.timecounter.hardware: i8254
 
 -- 
 René Maroufi
 info at maroufi.net