linux-kernel - Re: PROBLEM: Performance drop

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Date:	Sat, 7 Jul 2012 15:45:20 +0100
From:	Jason Vas Dias <jason.vas.dias@...il.com>
To:	Andreas Herrmann <herrmann.der.user@...glemail.com>
Cc:	Comrade DOS <suloevdmitry@...il.com>, linux-kernel@...r.kernel.org,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: PROBLEM: Performance drop

Sorry, of course the commit I backed out was :
9bcb8118965ab4631a65ee0726e6518f75cda6c5.

On Sat, Jul 7, 2012 at9bcb8118965ab4631a65ee0726e6518f75cda6c5. 3:40
PM, Jason Vas Dias <jason.vas.dias@...il.com> wrote:
> I can confirm that the AMD Turion X2 2.2Ghz  HP Compaq 6715b
> "business" x86_64 k8 dual-core laptops circa 2007
> DO get stuck in 800Khz mode  and cannot switch out of it after booting
> the "stable" "v3.4.4" tagged kernel.
>
> I followed the containing post and reverted commit
> ff74ae50f01ee67764564815c023c362c87ce18b :
>
> Commit d51cdad33bb5bb370c05129f7c7f3a16a55eff40
> Author: root <root@...spc.localdomain>
> Date:   Fri Jul 6 18:57:03 2012 +0000
>
>     Revert "ACPI: Evaluate thermal trip points before reading temperature"
>
>     This reverts commit 9bcb8118965ab4631a65ee0726e6518f75cda6c5.
>
> commit ff74ae50f01ee67764564815c023c362c87ce18b
> Author: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Date:   Fri Jun 22 11:37:50 2012 -0700
>
> And wow !  what a difference - back to a circa 2007 machine versus  a
> circa 1987 machine.
>
> Not too many of us  left around trying to run the latest version of
> linux on nearly 5-year-old hardware I guess, but still -
> please can you restore correct Linux cpufreq & thermal operation on
> old-style AMD k8 CPUs ?
> They do seem to depend on the temperature being set BEFORE 1st entry .
>
> Thanks & Regards,
> Jason Vas Dias (a Software Engineer) <jason.vas.dias@...il.com>
>
>
> On Wed, May 30, 2012 at 1:43 PM, Andreas Herrmann
> <herrmann.der.user@...glemail.com> wrote:
>> On Wed, May 30, 2012 at 03:20:27AM +0700, Comrade DOS wrote:
>>> > Unfortunately you have used acpi=debug instead of apic=debug.  So I
>>> > can't compare I/O APIC configurations between the different test
>>> > scenarios.
>>>
>>> Sorry me for this mistake.
>>
>> No problem.
>>
>> The logs show no difference in IO-APIC pin usage.
>> So it's not the old problem ...
>>
>> Comparing both logs I found following differences:
>>
>> (Most other stuff seems just to be changed formatting.)
>>
>> -ACPI: Thermal Zone [TZ1] (67 C)
>> +ACPI: Thermal Zone [TZ1] (62 C)
>>
>> I think what's shown is the temperature value which just differed
>> between the boots. But that made me look at acpi/thermal.c where the
>> messages came from. The only change between 3.3 and 3.4 is this
>> commit:
>>
>>   commit 9bcb8118965ab4631a65ee0726e6518f75cda6c5
>>   Author: Matthew Garrett <mjg@...hat.com>
>>   Date:   Wed Feb 1 10:26:54 2012 -0500
>>
>>     ACPI: Evaluate thermal trip points before reading temperature
>>
>> I'd suggest to do a test with this patch reverted.  Maybe this change
>> to fix issues with one HP Laptop (re-)intruduced the trouble with your
>> system.
>>
>> If reverting the patch helps we have to take a closer look at your
>> ACPI tables.  So can you please do a
>>
>>  # git revert 9bcb8118965ab4631a65ee0726e6518f75cda6c5
>>
>> on top of v3.4 and rebuid your kernel and rerun your test (with
>> apic=debug. This allows easier diff to dmesg output of your previous
>> test runs).
>>
>> In any case it also would be good to have the acpi tables from your
>> system. So please also use
>> # acpidump >acpidump.3.3    (using the 3.3.x kernel)
>> # acpidump >acpidump.3.4    (using the unmodified 3.4 version)
>>
>> and send all files as attachments to your mail.
>>
>> This will allow me to look at your thermal zone definitions in the
>> working and non-working case.
>>
>>
>> Thanks,
>>
>> Andreas
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