Subject: Re: Poor timekeeping on x86 smp branch?
To: Rafal Boni <>
From: John Franklin <>
List: tech-smp
Date: 04/23/2002 14:58:58
On Tue, Apr 23, 2002 at 02:45:22PM -0400, Rafal Boni wrote:
> In message <>, you write: 
> -> | 	I figured I'd send a heads-up if this wasn't a known problem; in
> -> | 	case it *isn't* I can do some poking around, but unfortunately
> -> | 	have too many other things on my plate to do any thorough digging.
> -> 
> -> How horrible is horrible?
> *Really* horrible; lost 45 minutes over the course of 9 hours and ntpd
> seemed to be primarily responsible for that badness... The clock in that
> box is nowhere near as bad by itself.

I've seen this before.  On your dmesg output, look for lines like:

cpu0: calibrating local timer
cpu0: apic clock running at 66 MHz

Is the apic running at a reasonable rate?

John Franklin
ICBM: 3543'56"N 7853'27"W