Mailinglist Archive: opensuse-kernel (69 mails)

[Jeff Mahoney <jeffm@xxxxxxxx>]

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Jan Beulich wrote:
> > > > PGNet Dev <pgnet.dev+oskrn@xxxxxxxxx> 02.08.09 20:27 >>>
> > i've built up a new openSUSE server on a
> >
> >      mobo: ASUS M3A78-CM, BIOS r1903
> >      cpu: AMD 2.8GHz Phenom II X4 920 (Black)
> >
> > @ BIOS, i've overclocked the CPU by 33% from 2.8Hz -> 1.33 x 2.*8 = 3.7GHz.
> >
> > booting to OS, the reported(/available) CPU freq is NOT that which the
> > BIOS reports.
> >
> > questions:
> >
> >      (1) is this a bug, or expected behavior for OC'ing?
> >      (2) if a bug, is it in kernel, or BIOS?
>
> BIOS: Both this
>
> > > >      available frequency steps: 2.80 GHz, 2.10 GHz, 1.60 GHz, 800 MHz
>
> and (presumably, as you didn't show it) /var/log/messages would confirm
> this. The identifiers for the corresponding frequencies are stored in ACPI
> tables and/or MSRs, so if the BIOS "supported" overclocking, it would have
> to update these tables/registers (the actual frequencies get calculated
> from these identifiers).
>
> The value /proc/cpuinfo reports is simply one of the frequencies reported
> as available.

The thing is that the non-CnQ mode is reported as 3.7 GHz. I don't know
enough about CnQ to know why that is - but values outside of the
original tables are getting reported if we're seeing the 3.7 GHz there.

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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