Re: AMD FX-6100 boot pauses with ACPI

[Jukka Ruohonen <jruohonen%iki.fi@localhost>]

On Wed, Feb 01, 2012 at 09:56:22AM +0000, Ian Clark wrote:
> Yup, I think it's 0x15. Even checked with a printf  in the above code
> to be sure. :) (As I don't really know what I'm doing.)
> 
> However applying the above didn't seem to change anything.

The last time I checked, AMD did not have a BKDG ("bios and kernel
developer's guide") for family 15h yet, so I don't know about the
details of C1E on Bulldozers. Of course this is entirely NetBSD's fault,
as all C1E-problems are caused by the fact that C-states are not generally
supported, whatever their name may be.

> When fiddling again last night I did notice the bios setting has 'on,
> off and auto', is there any chance that 'on' could be causing the
> above to be ignored?

Could be, but no idea.

> (root:/usr2/src)# cvs diff sys/arch/x86/acpi/acpi_cpu_md.c
> Index: sys/arch/x86/acpi/acpi_cpu_md.c
> ===================================================================
> RCS file: /cvsroot/src/sys/arch/x86/acpi/acpi_cpu_md.c,v
> retrieving revision 1.69
> diff -r1.69 acpi_cpu_md.c
> 269a270
> >               case 0x15:

Yes.

> AS the problem can be addressed by flipping a setting I'm not worried
> about it so please don't spend too much time, however I'm happy to try
> stuff if you want help tracking it down.

Well, as I wrote above, we don't need to track it down or add more weird
quirks -- we simply need to support C-states. Unfortunately, this is easier
said than done (requires in-depth knowledge particularly about x86 timers,
which are kind of a mess in NetBSD ATM).

- Jukka.