[TriLUG] CPU speed and custom kernel

[Scott Lambdin]

Did you ask Debby forums?  This could be very educational.


On Thu, Nov 21, 2013 at 12:44 PM, Sean Alexandre <sean at alexan.org> wrote:

> I've built my own kernel, but the CPU runs faster (hotter, more fan noise,
> etc.)
>
> I can't figure out why it's faster. Everything I've checked is the same
> between
> the two kernels. If I boot to the Debian provided kernel the CPU runs at
> 800
> MHz, but if I boot to my custom kernel it runs at 1.8 GHz. (These are
> baseline
> speeds, after boot without running anything else.)
>
> Here's what I've checked so far:
>
> * Kernel versions are the same. The Debian version is 3.2.0-4-amd64 and the
>   version I got from kernel.org is 3.2.52.
> * The boot command line has the same paremeters for both:
>   linux /vmlinuz-3.2.0-4-amd64 root=/dev/mapper/tuzo-root ro quiet
> * Both boot to the same root file system, and use the same configuration
> files.
> * The .config file used to build the custom kernel is the same as the one
> used
>   to build the Debian kernel. (I'm going to pare it down to just what I
> need
>   once I figure out this problem.)
> * Both use the ondemand cpufreq governor.
>
> Is there anything else I should check?
>
> My next step would be to try and build the kernel source from the Debian
> package instead of from kernel.org. Maybe this is a code difference?
>
> --
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