Re: acpi-cpufreq; Intel Johnstown (Atom N270)

Forest Bond
2009-08-13T19:09:02Z

[-- Attachment #1: Type: text/plain, Size: 1120 bytes --]

Hi,

On Thu, Aug 13, 2009 at 03:07:41PM -0400, Dave Jones wrote:
> On Thu, Aug 13, 2009 at 02:29:08PM -0400, Forest Bond wrote:
> > Hi,
> >
> > On Thu, Aug 13, 2009 at 01:25:57PM -0400, Forest Bond wrote:
> > > I'm using an Intel Johnstown board with an Atom N270 processor. Performance
> > > seems to improve dramatically with acpi-cpufreq loaded. This caught me by
> > > surprise. I had assumed that without loading acpi-cpufreq the CPU would be
> > > running at its maximum speed all the time.
> >
> > I ran some tests to get some numbers. My findings indicate that before
> > acpi-cpufreq is loaded the CPU is running at 800MHz even though /proc/cpuinfo
> > indicates 1.6GHz.
>
> if no cpufreq modules have been loaded, the CPU will be running at whatever
> p-state the BIOS programmed it to start up at. In your case for some reason, that's
> the 'slow' speed.

Okay, that's what I figured.

Looks like there's some BIOS settings that may have an effect. I'll play with
those.

Thanks,
Forest