linux-kernel - APIC frequency too slow on HP dv5z

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Message-ID: <48E28443.7060708@symas.com>
Date:	Tue, 30 Sep 2008 12:55:47 -0700
From:	Howard Chu <hyc@...as.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: APIC frequency too slow on HP dv5z

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/
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