From: Arjan van de Ven <arjan@linux.intel.com>
To: paulmck@linux.vnet.ibm.com
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>,
Linux PM <linux-pm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Rafael Wysocki <rafael.j.wysocki@intel.com>,
Len Brown <len.brown@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>,
Zhang Rui <rui.zhang@intel.com>, Rob Landley <rob@landley.net>
Subject: Re: [PATCH 3/3] PM: Introduce Intel PowerClamp Driver
Date: Tue, 13 Nov 2012 13:56:45 -0800 [thread overview]
Message-ID: <50A2C21D.6070108@linux.intel.com> (raw)
In-Reply-To: <20121113211602.GA30150@linux.vnet.ibm.com>
On 11/13/2012 1:16 PM, Paul E. McKenney wrote:
> On Mon, Nov 12, 2012 at 02:03:51PM -0800, Jacob Pan wrote:
>> Intel PowerClamp driver performs synchronized idle injection across
>> all online CPUs. The goal is to maintain a given package level C-state
>> ratio.
>>
>> Compared to other throttling methods already exist in the kernel,
>> such as ACPI PAD (taking CPUs offline) and clock modulation, this is often
>> more efficient in terms of performance per watt.
>>
>> Please refer to Documentation/thermal/intel_powerclamp.txt for more details.
>
> If I read this correctly, this forces a group of CPUs into idle for
> about 600 milliseconds at a time. This would indeed delay grace periods,
6ms not 600
prev parent reply other threads:[~2012-11-13 21:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-12 22:03 [PATCH 0/3] pm: Intel powerclamp driver Jacob Pan
2012-11-12 22:03 ` [PATCH 1/3] tick: export nohz tick idle symbols for module use Jacob Pan
2012-11-12 22:03 ` [PATCH 2/3] x86/nmi: export local_touch_nmi() symbol for modules Jacob Pan
2012-11-12 22:03 ` [PATCH 3/3] PM: Introduce Intel PowerClamp Driver Jacob Pan
2012-11-13 6:33 ` Joe Perches
2012-11-13 6:55 ` Jacob Pan
2012-11-13 21:16 ` Paul E. McKenney
2012-11-13 21:39 ` Jacob Pan
2012-11-13 22:23 ` Paul E. McKenney
2012-11-13 22:45 ` Arjan van de Ven
2012-11-13 23:02 ` Rafael J. Wysocki
2012-11-14 0:03 ` Paul E. McKenney
2012-11-14 0:03 ` Paul E. McKenney
2012-11-14 0:08 ` Arjan van de Ven
2012-11-14 1:14 ` Jacob Pan
2012-11-14 1:34 ` Paul E. McKenney
2012-11-14 2:59 ` Arjan van de Ven
2012-11-15 3:22 ` Paul E. McKenney
2012-11-14 1:24 ` Jacob Pan
2012-11-13 21:56 ` Arjan van de Ven [this message]
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=50A2C21D.6070108@linux.intel.com \
--to=arjan@linux.intel.com \
--cc=hpa@zytor.com \
--cc=jacob.jun.pan@linux.intel.com \
--cc=len.brown@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=paulmck@linux.vnet.ibm.com \
--cc=rafael.j.wysocki@intel.com \
--cc=rob@landley.net \
--cc=rui.zhang@intel.com \
--cc=tglx@linutronix.de \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.