DragonFly users List (threaded) for 2012-07
Re: frequency scaling on D525MW not working properly
On Tue, Jul 24, 2012 at 3:24 AM, Sven Gaerner <firstname.lastname@example.org> 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 <email@example.com> wrote:
>> > On Sun, 22 Jul 2012 21:16:54 +0200, Sven Gaerner <firstname.lastname@example.org> 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 <email@example.com>
>> >>> 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:
2) sysctl hw.acpi.cpu.cx_lowest=C3
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