[Question] "cat /proc/cpuinfo: different results between my F13 (i686) and F13-Beta-Livecd (x86_64)

Adam Williamson awilliam at redhat.com
Thu May 6 13:03:57 UTC 2010


On Thu, 2010-05-06 at 10:08 +0200, Joachim Backes wrote:
> On 05/06/2010 09:21 AM, cornel panceac wrote:
> >
> >
> > 2010/5/6 Joachim Backes <joachim.backes at rhrk.uni-kl.de
> > <mailto:joachim.backes at rhrk.uni-kl.de>>
> >
> >     Hi,
> >
> >     I have an asrock board ConRoe1333-DVI/H. CPU: Intel core duo 4500.
> >
> >     Running the "cat /proc/cpuinfo" with F13-Beta-Live (x86_64), it
> >     reports *1200.00 MHz* for each core.
> >
> >     Getting the same results on a KNOPPIX-6.2 (i686).
> >
> >     But running the same command on my real F13 system (i686) says:
> >     *2194.034 MHz* for each core.
> >
> >     Can somebody explain these differences?
> >
> >
> > sounds like frequency scaling, to me.
> 
> Hi Cornel,
> 
> thanks for the hint. *cpuspeed* was the culprit: If booting my F13 in 
> runlevel 1, it shows the same reduced MHz. This results from an enabled 
> cpuspeed in runlevel 1. By stopping cpuspeed, getting immediately the 
> std CPU speed (2.2 GHz).

That's not exactly being the 'culprit', it's simply doing what it's
supposed to do. You probably don't really want your CPU to run at 2.2GHz
all the time, it'll get hotter and eat more power for no good reason. As
long as it scales to 2.2GHz when you actually need the power, that's
sane...
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org
http://www.happyassassin.net



More information about the test mailing list