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From: Len Brown <len.brown@intel.com>
To: jg@laptop.org
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>,
	Matthew Garrett <mjg59@srcf.ucam.org>,
	Linux Kernel ML <linux-kernel@vger.kernel.org>,
	Dominik Brodowski <linux@dominikbrodowski.net>,
	ACPI ML <linux-acpi@vger.kernel.org>,
	Adam Belay <abelay@novell.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
	Arjan van de Ven <arjan@linux.intel.com>,
	devel@laptop.org
Subject: Re: [OLPC-devel] Re: [RFC][PATCH 1/2] ACPI: Idle Processor PM Improvements
Date: Thu, 31 Aug 2006 23:53:04 -0400	[thread overview]
Message-ID: <200608312353.05337.len.brown@intel.com> (raw)
In-Reply-To: <1157070616.7974.232.camel@localhost.localdomain>

On Thursday 31 August 2006 20:30, Jim Gettys wrote:
> On Thu, 2006-08-31 at 17:13 -0600, Bjorn Helgaas wrote:
> > On Wednesday 30 August 2006 13:43, Matthew Garrett wrote:
> > > That would be helpful. For the One Laptop Per Child project (or whatever 
> > > it's called today), it would be advantageous to run without acpi.
> > 
> > Out of curiosity, what is the motivation for running without acpi?
> > It costs a lot to diverge from the mainstream in areas like that,
> > so there must be a big payoff.  But maybe if OLPC depends on acpi
> > being smarter about power or code size or whatever, those improvements
> > could be made and everybody would benefit.
> 
> Good question; I see Matthew beat me to part of the explanation, but
> here is more detail:

I recommended that the OLPC guys not use ACPI.

I do not think it would benefit their system.  Although it is an i386
instruction set, their system is more like an embedded device than
like a traditional laptop.

The Geode doesn't suport any C-states -- so ACPI wouldn't help them there anyway.

As Jim wrote, OLPC plans to suspend-to-ram from idle, and to keep video running,
so ACPI wouldn't help them on that either.

Re: optimizing suspend/resume speed
I expect suspend/resume speed has more to do with devices than with ACPI.
But frankly, with gaping functionality holes in Linux suspend/resume support such as
IDE and SATA, I think that optimizing for suspend/resume speed on a mainstream laptop
is somewhat "forward looking".

-Len

  reply	other threads:[~2006-09-01  3:52 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-30 18:40 Pallipadi, Venkatesh
2006-08-30 19:43 ` Matthew Garrett
2006-08-31 23:13   ` Bjorn Helgaas
2006-09-01  0:30     ` [OLPC-devel] " Jim Gettys
2006-09-01  3:53       ` Len Brown [this message]
2006-09-01  4:12         ` Matthew Garrett
2006-09-01 15:51           ` Jordan Crouse
2006-09-01 13:14         ` [OLPC-devel] Re: [RFC][PATCH 1/2] " Carl-Daniel Hailfinger
2006-09-01 21:52         ` Andi Kleen
2006-09-01 22:57           ` Alan Cox
2006-09-04 13:13         ` Pavel Machek
2006-09-04 13:09       ` Pavel Machek
2006-09-05 14:31         ` Jim Gettys
2006-09-06 10:37           ` Pavel Machek
2006-09-06 14:58             ` Jordan Crouse
2006-09-12  9:21               ` Pavel Machek
2006-09-12 18:14                 ` Jim Gettys
2006-09-12 18:27                   ` Mitch Bradley
2006-09-12 20:18                   ` Jordan Crouse
2006-09-14  9:20                     ` Pavel Machek
2006-09-14  9:18                   ` Pavel Machek
2006-09-14 11:29                     ` Jim Gettys
2006-09-06 15:19             ` [OLPC-devel] Re: [RFC][PATCH 1/2] " Jim Gettys
2006-09-12  9:21               ` Pavel Machek

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