linux-kernel - Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so far

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Date:	Sat, 17 Mar 2007 12:05:52 +0100
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Len Brown <lenb@...nel.org>
Cc:	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Adrian Bunk <bunk@...sta.de>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [BUG] 2.6.21-rc1,2,3 regressions on my system that I found so
	far

On Sat, 2007-03-17 at 10:56 +0100, Thomas Gleixner wrote:
> calibrating APIC timer ...
> ... lapic delta = 2426884
> ... PM timer delta = 833908
> APIC calibration PIT not consistent with PM Timer: 232ms instead of 100ms
> APIC delta adjusted to PM-Timer: 1041737 (2426884)
> ..... delta 1041737
> ..... mult: 44749065
> ..... calibration result: 166677
> ..... CPU clock speed is 4659.0624 MHz.
> ..... host bus clock speed is 166.0677 MHz.
> 
> This box is off by factor 2.3 and using the PM-Timer instead of the
> PIT/jiffies values gives me a correct result.
> 
> Another one:
> APIC calibration not consistent with PM Timer: 2020ms instead of 100ms
> APIC delta adjusted to PM-Timer: 1254436 (25341111)
> 
> Off by factor 20 !!

This weird behaviour also can be seen with the BogoMIPS calibration:

Calibrating delay using timer specific routine.. 6428.32 BogoMIPS 
(lpj=12856647)
....
Initializing CPU#1
Calibrating delay using timer specific routine.. 103837.25 BogoMIPS 
(lpj=207674508)

Note, that I never observed that on CPU#0. It always affects CPU#1.

	tglx


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