From: Chase Douglas <chase.douglas@canonical.com>
To: Len Brown <lenb@kernel.org>
Cc: x86@kernel.org, linux-pm@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: Re: [PATCH 8/8] intel_idle: create a native cpuidle driver for select intel processors
Date: Fri, 28 May 2010 11:09:40 -0400 [thread overview]
Message-ID: <1275059380.5612.60.camel@cndougla-ubuntu> (raw)
In-Reply-To: <alpine.LFD.2.00.1005272359510.24823@localhost.localdomain>
On Fri, 2010-05-28 at 00:16 -0400, Len Brown wrote:
> > I see that you have updated this code in your tree to disable C4 and C6
> > on atom. This has piqued my curiosity. I've now seen 2 atom netbooks
> > from different OEMs that hide C4 when you plug the power in. After the
> > first machine I thought, "must be a BIOS/ACPI bug," but now I'm
> > beginning to wonder if there's some issue with atom C4 states? That's
> > beside the fact that I've not seen C6 on either machine at all. Do you
> > have any insight?
>
> The reasoning behind ACPI taking deep C-states away
> when on AC is the assumption that users on AC
> care more about low latency and high performance
> than they care about power savings, heat, and noise.
Maybe they forgot that a netbook is still a *lap*top when they did this,
cause I can't keep mine on my lap when it's plugged in :). The CPU idles
at 60 centigrade when powered on, and drops to a manageable 30-ish
centigrade when running on battery.
> So my intent is to give Linux control over this decision,
> via PM_QOS or otherwise. At the moment C4 is commented out
> because when i first tested it failed the lapic timer workaround.
I am looking forward to testing out these changes on my netbook once
this issue get sorted out!
-- Chase
next prev parent reply other threads:[~2010-05-28 15:09 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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1275059380.5612.60.camel@cndougla-ubuntu \
--to=chase.douglas@canonical.com \
--cc=len.brown@intel.com \
--cc=lenb@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@lists.linux-foundation.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).