[lkml]   [2006]   [Oct]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [discuss] Re: Please pull x86-64 bug fixes
OK, lets' take K8 processor performance states (p-states) as an example:
BIOS, which should know 'best' about a given platform, needs to
communicate to the OS what 'voltage' (VID code) is correct for given
'frequency' (FID),
and it can do that via ACPI processor tables (_PSS). Otherwise, OS code
is left with having to manage a HUGE amount 'specifics' (processor
models), and endless driver revisions to account for new parts.

So, one can argue that there's merit on having ACPI, it's just a shame
when BIOS doesn't get it right! (thus the justification for lack of
'trust'... the same can probably be said about other BIOS issues, not
just ACPI)

Leo Duran

-----Original Message-----
From: Rafael J. Wysocki []
Sent: Friday, October 06, 2006 5:01 PM
To: Linus Torvalds
Cc: Arjan van de Ven; Jeff Garzik; Andi Kleen;;
Subject: Re: [discuss] Re: Please pull x86-64 bug fixes

On Friday, 6 October 2006 18:07, Linus Torvalds wrote:
> On Fri, 6 Oct 2006, Arjan van de Ven wrote:
> >
> > we can do a tiny bit better than the current code; some chipsets
> > the address of the MMIO region stored in their config space; so we
> > get to that using the old method and validate the acpi code with
> Yes. I think trusting ACPI is _always_ a mistake. It's insane. We
> never ask the firmware for any data that we can just figure out
> And we should tell all hardware companies that firmware tables are
> and that we just want to know what the hell the registers MEAN!
> I've certainly tried to tell Intel that. I think they may even have
> me occasionally.
> I can't understand why some people _still_ think ACPI is a good idea..

I violently agree.


You never change things by fighting the existing reality.
R. Buckminster Fuller

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-10-07 00:35    [W:0.084 / U:15.648 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site