linux-kernel - Re: Linux 2.6.29-rc6

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Date:	Thu, 26 Feb 2009 23:06:17 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	john stultz <johnstul@...ibm.com>
cc:	Jesper Krogh <jesper@...gh.cc>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>
Subject: Re: Linux 2.6.29-rc6

On Thu, 26 Feb 2009, john stultz wrote:
> On Thu, 2009-02-26 at 22:35 +0100, Jesper Krogh wrote:
> > > Also mind sending the full dmesg for both kernels?
> > 
> > http://krogh.cc/~jesper/dmesg-2.6.29-rc6.txt
> > http://krogh.cc/~jesper/dmesg-2.6.26.8.txt
> 
> So one interesting difference:
> 2.6.26.8:	TSC calibrated against PM_TIMER
> 2.6.29-rc6:	Fast TSC calibration using PIT
> 
> Thomas, any thoughts as to why we might be calibrating off the PIT
> instead of the PM_TIMER w/ 2.6.29?

Yup, because we introduced the Fast PIT calibration in 2.6.28.

Is the delta anything NTP might get upset about:

2.6.26: time.c: Detected 2311.847 MHz processor.
2.6.29: Detected 2310.029 MHz processor.

If yes, then we need to fix NTP not the calibration code :)
 
> Maybe does this line provide a hint?
> FADT: X_PM1a_EVT_BLK.bit_width (16) does not match PM1_EVT_LEN (4)

Red herring.
 
Thanks,

	tglx
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