From: Dave Jones <davej@redhat.com>
To: Forest Bond <forest@alittletooquiet.net>
Cc: linux-acpi@vger.kernel.org
Subject: Re: acpi-cpufreq; Intel Johnstown (Atom N270)
Date: Thu, 13 Aug 2009 15:07:41 -0400 [thread overview]
Message-ID: <20090813190741.GA7808@redhat.com> (raw)
In-Reply-To: <20090813182908.GC9385@alittletooquiet.net>
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
next prev parent reply other threads:[~2009-08-13 19:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-13 17:25 acpi-cpufreq; Intel Johnstown (Atom N270) Forest Bond
2009-08-13 18:29 ` Forest Bond
2009-08-13 19:07 ` Dave Jones [this message]
2009-08-13 19:09 ` Forest Bond
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