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

[ message continues ]

Hmm, strange. Which kernel version ? 

Thanks,

	tglx
--

[ message continues ]

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.

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

[ message continues ]

Ok. Can you please add apic=verbose to the kernel command line so we
get more detailed info about that ?

Thanks,

	tglx
--

[ message continues ]

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/
--

[ message continues ]