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

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Date:	Mon, 19 Jan 2009 09:45:28 -0500
From:	Mark Hounschell <markh@...pro.net>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
CC:	Mark Hounschell <dmarkh@....rr.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: PROBLEM: Can't boot a (HZ = 1000) kernel using an AMD Phenom-II
 processor

Bartlomiej Zolnierkiewicz wrote:
> On Monday 19 January 2009, Mark Hounschell wrote:
>> Mark Hounschell wrote:
>>> I upgraded from a Phenom to a Phenom-II processor and I could no longer boot.
>>>
>>> I have tried kernels from 2.6.26 through 2.6.28.
>>>
>>> I _can_ however boot these kernels when they are configured for HZ = 250. I
>>> haven't tried HZ = 300. But certainly if HZ = 1000 the boot hangs at the spot
>>> indicated below in the dmesg output.
>>>
>>> The machine is up and stable running 2.6.26.8 with a (HZ = 1000) configured kernel.
>>>
>> The machine is up and stable running 2.6.26.8 with a (HZ = 250) configured
>> kernel. Sorry.
>>
>>> While running a 2.6.26.8 kernel configured for HZ = 250:
> 
> [...]
> 
>>> Checking if this processor honours the WP bit even in supervisor mode...Ok.
>>>
>>>
>>>       The 2.6.26.8 kernel hangs up right here.
>>>
>>>
>>> CPA: page pool initialized 1 of 1 pages preallocated
>>> SLUB: Genslabs=12, HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
>>> hpet clockevent registered
>>> calibrate_delay_direct() failed to get a good estimate for loops_per_jiffy.
>>> Probably due to long platform interrupts. Consider using "lpj=" boot option.
>>> Calibrating delay loop... 3956.73 BogoMIPS (lpj=7913472)
> 
> Even if it boots it may not work reliably since lpj/BogoMIPS are too small
> (they should be the same as for other CPUs) which in turn could result in too
> short delay loops.
> 
>>> Security Framework initialized
>>> Capability LSM initialized
>>> Mount-cache hash table entries: 512
>>> CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
>>> CPU: L2 Cache: 512K (64 bytes/line)
>>> CPU 0(4) -> Core 0
>>> Checking 'hlt' instruction... OK.
>>> ACPI: Core revision 20080321
>>> ENABLING IO-APIC IRQs
>>> ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
>>> CPU0: AMD Processor model unknown stepping 02
>>> Booting processor 1/1 ip 2000
>>> Initializing CPU#1
>>> Calibrating delay using timer specific routine.. 6000.60 BogoMIPS (lpj=12001200)
> 
> Here are the proper values.
> 
>>> CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
>>> CPU: L2 Cache: 512K (64 bytes/line)
>>> CPU 1(4) -> Core 2
>>> x86 PAT enabled: cpu 1, old 0x7040600070406, new 0x7010600070106
>>> CPU1: AMD Processor model unknown stepping 02
>>> Booting processor 2/2 ip 2000
>>> Initializing CPU#2
>>> Calibrating delay using timer specific routine.. 6000.47 BogoMIPS (lpj=12000950)
> 
> also OK
> 
>>> CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
>>> CPU: L2 Cache: 512K (64 bytes/line)
>>> CPU 2(4) -> Core 1
>>> x86 PAT enabled: cpu 2, old 0x7040600070406, new 0x7010600070106
>>> CPU2: AMD Processor model unknown stepping 02
>>> Booting processor 3/3 ip 2000
>>> Initializing CPU#3
>>> Calibrating delay using timer specific routine.. 6000.47 BogoMIPS (lpj=12000955)
> 
> ditto
> 
> That being said I don't know why delay calibration loop fails on CPU0.
> 
> You may try booting with "lpj=12001200" kernel parameter to workaround
> the issue (it should fix booting with HZ == 1000) and/or try 2.6.29-rc2
> (the problem may have been already fixed).
> 
> Thanks,
> Bart
>

I'll try "lpj=12001200" and 2.6.29-rc2 later when I get home this ev.

But I noticed CPU2 is different too. Is CPU1 the correct one?

>>> Initializing CPU#0
>>> Calibrating delay loop... 3956.73 BogoMIPS (lpj=7913472)

>>> Initializing CPU#1
>>> Calibrating delay using timer specific routine.. 6000.60 BogoMIPS (lpj=12001200)

>>> Initializing CPU#2
>>> Calibrating delay using timer specific routine.. 6000.47 BogoMIPS (lpj=12000950)

>>> Initializing CPU#3
>>> Calibrating delay using timer specific routine.. 6000.47 BogoMIPS (lpj=12000955)

Mark
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