David O'Brien obrien at
Tue Apr 19 11:18:34 PDT 2005

On Tue, Apr 19, 2005 at 11:59:53AM -0600, Scott Long wrote:
> David O'Brien wrote:
> >On Sat, Apr 16, 2005 at 01:03:31PM +0200, O. Hartmann wrote:
> >
> >>I have ASUS A8N-SLI Deluxe mobo. BIOS revision is 1006. I have no 
> >>problems with
> >>ACPI. APIC works with NO_MIXED_MODE commented out in kernel.
> >
> >
> >Disable the NO_MIXED_MODE option is a performance degradation.
> >Bending over and taking it up the a** across all motherboards (which DES
> >has forced on 5.4-RELEASE); makes the ASUS A8N-SLI Deluxe not "perfectly
> >working".
> >
> According to the APIC maintainer, and according to some quick benchmarks 
> myself, mixed mode has almost no performance impact.

Maybe with the latest code - if you're talking about before the very
recent jhb commits.  Peter has said several times there is(was) a
performance issue.  'mixed mode' also is (was?) expressly prohibited by
the ACPI spec.  

-- David  (obrien at

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