From: Pavel Machek <pavel@ucw.cz>
To: Len Brown <lenb@kernel.org>
Cc: Thomas Renninger <trenn@suse.de>,
linux-pm@lists.linux-foundation.org, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [linux-pm] idle-test patches queued for upstream
Date: Wed, 16 Jun 2010 09:53:00 +0200 [thread overview]
Message-ID: <20100616075259.GA1671@ucw.cz> (raw)
In-Reply-To: <alpine.LFD.2.00.1005272023510.24823@localhost.localdomain>
On Thu 2010-05-27 20:59:07, Len Brown wrote:
> > > ... we think we can do better than ACPI.
>
> > Why exactly? Is there any info missing in the ACPI tables?
> > Or is this just to be more independent from OEMs?
>
> ACPI has a few fundmental flaws here. One is that it reports
> exit latency instead of break-even power duration.
> The other is that it requires a BIOS writer to
> get the tables right.
>
> Both of these are fatal flaws.
Intel is co-author of ACPI spec, right? So what about fixing those?
> > > Indeed, on my (production level commerically available) Nehalem desktop
> > > the ACPI tables are broken and an ACPI OS idles at 100W. With this
> > > driver the box idles at 85W.
>
> > What exactly was broken there?
>
> Dell's BIOS developer botched a bug fix immediately before the system
> went to market and disabled support for all ACPI C-states except C1.
> After several month of shipping systems, they still were unable
> to ship them with a fixed BIOS.
I always thought that cpu vendors have ways to work with bios manufacturers...
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
prev parent reply other threads:[~2010-06-16 7:53 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-27 2:42 idle-test patches queued for upstream Len Brown
2010-05-27 2:42 ` [PATCH 1/8] cpuidle: fail to register if !CONFIG_CPU_IDLE Len Brown
2010-05-27 2:42 ` [PATCH 2/8] cpuidle: add cpuidle_unregister_driver() error check Len Brown
2010-05-27 3:14 ` Andrew Morton
2010-05-27 5:11 ` [PATCH-v2 " Len Brown
2010-05-27 5:13 ` Andrew Morton
2010-05-27 2:42 ` [PATCH 3/8] cpuidle: make cpuidle_curr_driver static Len Brown
2010-05-27 5:27 ` [PATCH-v2 " Len Brown
2010-05-27 18:40 ` Luck, Tony
2010-05-27 23:30 ` Len Brown
2010-05-27 2:42 ` [PATCH 4/8] ACPI: allow a native cpuidle driver to displace ACPI Len Brown
2010-05-27 2:42 ` [PATCH 5/8] sched: clarify commment for TS_POLLING Len Brown
2010-05-27 5:53 ` [PATCH-v2 " Len Brown
2010-05-27 2:42 ` [PATCH 6/8] acpi_pad: uses MONITOR/MWAIT, so it doesn't need to clear TS_POLLING Len Brown
2010-05-27 2:42 ` [PATCH 7/8] ACPI: acpi_idle: touch TS_POLLING only in the non-MWAIT case Len Brown
2010-05-27 2:42 ` [PATCH 8/8] intel_idle: create a native cpuidle driver for select intel processors Len Brown
2010-05-27 3:44 ` Andrew Morton
2010-05-28 3:57 ` Len Brown
2010-05-30 9:20 ` Andi Kleen
2010-05-27 8:53 ` [linux-pm] " Thomas Renninger
2010-05-28 1:44 ` Len Brown
2010-05-28 7:46 ` Thomas Renninger
2010-05-28 17:38 ` Len Brown
2010-05-29 4:17 ` Thomas Renninger
2010-05-27 14:14 ` Kevin Hilman
2010-05-27 14:22 ` Arjan van de Ven
2010-05-27 14:36 ` Kevin Hilman
2010-05-28 0:22 ` Len Brown
2010-05-28 17:28 ` Kevin Hilman
2010-05-27 14:51 ` [linux-pm] " Igor Stoppa
2010-05-28 3:14 ` Arjan van de Ven
2010-05-28 17:27 ` Kevin Hilman
2010-05-29 0:38 ` Arjan van de Ven
2010-05-28 2:32 ` Chase Douglas
2010-05-28 4:16 ` Len Brown
2010-05-28 15:09 ` Chase Douglas
2010-05-28 17:43 ` Len Brown
2010-05-28 19:51 ` Chase Douglas
2010-05-28 20:14 ` Chase Douglas
2010-05-27 5:25 ` (No subject header) Milton Miller
2010-05-27 5:47 ` Len Brown
2010-05-27 8:45 ` [linux-pm] idle-test patches queued for upstream Thomas Renninger
2010-05-28 0:59 ` Len Brown
2010-05-28 8:07 ` Thomas Renninger
2010-05-28 17:42 ` Len Brown
2010-06-16 7:53 ` Pavel Machek [this message]
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