Re: frequency scaling on D525MW not working properly

[Sepherosa Ziehau <sepherosa@xxxxxxxxx>]

On Tue, Jul 24, 2012 at 9:57 AM, Sepherosa Ziehau <sepherosa@gmail.com> wrote:
> On Tue, Jul 24, 2012 at 3:24 AM, Sven Gaerner <sgaerner@gmx.net> wrote:
>> On Mon, Jul 23, 2012 at 09:44:06AM +0800, Sepherosa Ziehau wrote:
>>> On Mon, Jul 23, 2012 at 3:27 AM, Sascha Wildner <saw@online.de> wrote:
>>> > On Sun, 22 Jul 2012 21:16:54 +0200, Sven Gaerner <sgaerner@gmx.net> wrote:
>>> >
>>> >> On Sun, Jul 22, 2012 at 08:31:41PM +0200, Sascha Wildner wrote:
>>> >>>
>>> >>> On Sun, 22 Jul 2012 13:46:41 +0200, Sven Gaerner <sgaerner@gmx.net>
>>> >>> wrote:
>>> >>>
>>> >>> >[...]
>>>
>>> Hmm, disabling UEFI is OK, but make sure that you have enabled EST in
>>> BIOS (something probably read like "enhanced speed step" or something
>>> like "P-state").
>> There is no such option. And the only UEFI option is to enable booting
>> of an UEFI compliant OS. Speed stepping cannot be configured. The BIOS
>> options are very limited.
>>
>>> Besides CPU P-State, you could also set allowable CPU C-State to C3 by
>>> setting sysctl hw.acpi.cpu.cx_lowest and put tunable
>>> hw.i8254.intr_disable="0" in /boot/loader.conf (you need to reboot
>>> after changing /boot/loader.conf).  However, it should be noted that
>>> enabling C3 will disable LAPIC timer and i8254 timer will be used
>>> instead, which may cause extra overhead.
>> This seems not to change anything. The temperature remains the same. And
>> setting hw.acpi.cpu.cx_lowest returns with "Invalid Argument".
>
> I mean following steps:
> 1) Add the following line into into /boot/loader.conf, then reboot:
>     hw.i8254.intr_disable="0"
> 2) sysctl hw.acpi.cpu.cx_lowest=C3

I mean do step1) first, then do step 2) after step1)'s reboot.

i8254 is intentionally disabled by default, so some mobo w/o it could
boot properly.

Best Regards,
sephe

>
> Best Regards,
> sephe
>
> --
> Tomorrow Will Never Die



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