linux-kernel - Re: HPET (?) related hangs and breakage in 2.6.35,36

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Date:	Tue, 9 Nov 2010 19:01:23 +0100
From:	Borislav Petkov <bp@...64.org>
To:	Andrew Lutomirski <luto@....edu>
Cc:	Clemens Ladisch <clemens@...isch.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	x86 <x86@...nel.org>
Subject: Re: HPET (?) related hangs and breakage in 2.6.35,36

On Tue, Nov 09, 2010 at 12:44:48PM -0500, Andrew Lutomirski wrote:
> I may have just reproduced after a couple of days of uptime it in
> 2.6.36 with hpet=disable (in any case, the system hung and netconsole
> didn't work).
> 
> I'm currently testing the hpet_min_tick stuff, backported to 2.6.36,
> with hpet on.  Haven't had a problem yet, but I'll see what happens
> after a few hours.  So far, it said:
> 
> ACPI: HPET id: 0x8086a301 base: 0xfed00000 min tick: 128

This doesn't say what your BIOS has set it to originally. For that, do

hexdump -C /sys/firmware/acpi/tables/HPET

and check what does the u16 little endian value at offset 0x35 say.

-- 
Regards/Gruss,
Boris.

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