linux-kernel - Re: APIC frequency too slow on HP dv5z

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Message-ID: <48E55196.8060000@symas.com>
Date:	Thu, 02 Oct 2008 15:56:22 -0700
From:	Howard Chu <hyc@...as.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: APIC frequency too slow on HP dv5z

Thomas Gleixner wrote:
> On Thu, 2 Oct 2008, Howard Chu wrote:
>> Thomas Gleixner wrote:
>>> On Tue, 30 Sep 2008, Howard Chu wrote:
>>>
>>>> More often than not, on a warm boot I see something like this
>>>>
>>>> msg.new:[    1.940031] Using local APIC timer interrupts.
>>>> msg.new:[    1.944031] APIC timer calibration result 466046
>>>> msg.new:[    1.944031] Detected 0.466 MHz APIC timer.
>>>> msg.new:[    1.944031] APIC frequency too slow, disabling apic timer
>>>>
>>>> On cold boots it may see 12.5MHz, or may not...
>>>>
>>>> [    2.000584] Using local APIC timer interrupts.
>>>> [    2.004067] APIC timer calibration result 12500236
>>>> [    2.004080] Detected 12.500 MHz APIC timer.
>>>>
>>>> I haven't figured out yet what the pattern is behind the behavior. Has
>>>> anyone
>>>> else seen this kind of problem before?
>>> Hmm, strange. Which kernel version ?
>> I only started paying attention recently. 2.6.27-rc4 thru rc7 for sure. I'm
>> running rc7 right now, that's what those log snippets are from.
>
> Ok. Can you please add apic=verbose to the kernel command line so we
> get more detailed info about that ?

OK. Of course since you asked for it, the problem refused to show up. It took 
about a dozen reboots before it appeared again. And then it took 3-4 reboots 
to make it go away. Full dmesg output is here:
	http://www.highlandsun.com/hyc/msg.rc7.bad.gz
	http://www.highlandsun.com/hyc/msg.rc7.ok.gz

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/
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