linux-kernel - Re: PROBLEM: Can't boot a (HZ = 1000) kernel using an AMD Phenom-II processor

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Message-ID: <20090203151137.GB12017@aftab>
Date:	Tue, 3 Feb 2009 16:11:37 +0100
From:	Borislav Petkov <borislav.petkov@....com>
To:	Mark Hounschell <dmarkh@....rr.com>
CC:	Mark Hounschell <markh@...pro.net>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	john stultz <johnstul@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: PROBLEM: Can't boot a (HZ = 1000) kernel using an AMD
	Phenom-II processor

Hi,

On Tue, Feb 03, 2009 at 04:17:55AM -0500, Mark Hounschell wrote:
> Borislav Petkov wrote:
> > On Sat, Jan 31, 2009 at 04:15:58AM -0500, Mark Hounschell wrote:
> > 
> > [..]
> > 
> >> So were you able to reproduce this with my .config. Has anyone booted a Hz=1000
> >> kernel on an AMD Phenom-II? Is there something wrong with my .config? Is there
> >> anything else I can do?
> > 
> > Hi,
> > 
> > sorry for the delay - I've been busy last week and couldn't get to your
> > problem. So, I couldn't reproduce the bug here with a Phenom II and your
> > kernel config. However, we have a working theory, so can you please send
> > me the output of
> > 
> > xxd /sys/firmware/acpi/tables/APIC
> > 
> 
> markh@...ley:~> xxd /sys/firmware/acpi/tables/APIC
> 0000000: 4150 4943 8400 0000 014c 5258 3738 3020  APIC.....LRX780
> 0000010: 4157 5244 4143 5049 312e 3042 4157 5244  AWRDACPI1.0BAWRD
> 0000020: 0000 0000 0000 e0fe 0100 0000 0008 0000  ................
> 0000030: 0100 0000 0008 0101 0100 0000 0008 0202  ................
> 0000040: 0100 0000 0008 0303 0100 0000 010c 0400  ................
> 0000050: 0000 c0fe 0000 0000 020a 0000 0200 0000  ................
> 0000060: 0000 020a 0009 0900 0000 0f00 0406 0005  ................
> 0000070: 0001 0406 0105 0001 0406 0205 0001 0406  ................
> 0000080: 0305 0001

looks good at a glance...

> >
> > Also, can you boot a 64-bit, HZ1000 kernel on your machine?
> > 
> 
> No, a 64 bit kernel @1000Hz doesn't boot either. As with the 32 bit kernel,
> setting Hz to 250 allows it to boot. The messages are slightly different when it
> hangs on the 64bit kernel at 1000Hz.

That's not cool - as I said before, I can't reproduce this behavior here
which means that the problem might be chipset-related. What you could do
now is to boot the kernel with "debug initcall_debug log_buf_len=10M"
and try to capture the whole boot log with a serial console - or if that
doesn't work - make a screenshot with a camera of some sort. This might
shed some light on the question where exactly your machine hangs.

-- 
Regards/Gruss,
Boris.

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