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Re: CVS commit: src/sys/arch/x86/x86

On Mon, Aug 08, 2011 at 07:40:45AM -0400, Jared McNeill wrote:
> On Mon, 8 Aug 2011, Jukka Ruohonen wrote:
> >We should not really trust ACPI/FADT here. See acpicpu(4) how this is
> Why?

Because we (the operating system) know this better than the BIOS writer.
And because this flag is not reliable; numerous systems where tsc(9) is
"broken" miss this flag in my ACPI table collection, and vice versa.

> >derived from the actual CPU information. Additionally, I suggested 
> >decreasing
> >the quality of tsc(9) based on this information a long time ago, but joerg@
> >had concerns about this.
> TSC is considerably faster so definitely preferred, but if it doesn't 
> work, it doesn't work.

Obviously. I can not recall now what joerg@'s point was back then.

- Jukka.

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