Messages in this thread | | | Date | Thu, 29 Jan 2009 12:08:59 -0500 | From | Dave Jones <> | Subject | Re: a question about p4_clockmod module on Xeon quad core processors |
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On Thu, Jan 29, 2009 at 08:32:41AM -0800, Xiaoning Ding wrote:
> > > Thanks for the correction. > > > My experiments need to reduce CPU speed. However, I > > can only reduce the speed by about 30% (from 2.67GHz to > > 2GHz) with ACPI. That is not enough for the experiments. > > > > The ACPI P-states are nearly always correct, so you > > won't be > > able to go below 2GHz on this system. > > That's true for changing P-States with ACPI. But I can still get slower speed with clock modulation, right?
Clock modulation will lower the performance, but the clock speed will remain constant.
Dave
-- http://www.codemonkey.org.uk
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