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

Dave Jones
2009-08-13T19:07:49Z

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.

Dave