From: Yuyang Du <yuyang.du@intel.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Dirk Brandewie <dirk.brandewie@gmail.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Morten Rasmussen <morten.rasmussen@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>,
"vincent.guittot@linaro.org" <vincent.guittot@linaro.org>,
"daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
"preeti@linux.vnet.ibm.com" <preeti@linux.vnet.ibm.com>,
Dietmar Eggemann <Dietmar.Eggemann@arm.com>,
len.brown@intel.com, jacob.jun.pan@linux.intel.com
Subject: Re: [RFC PATCH 06/16] arm: topology: Define TC2 sched energy and provide it to scheduler
Date: Sun, 8 Jun 2014 07:53:07 +0800 [thread overview]
Message-ID: <20140607235307.GD22261@intel.com> (raw)
In-Reply-To: <20140606121305.GA8571@gmail.com>
On Fri, Jun 06, 2014 at 02:13:05PM +0200, Ingo Molnar wrote:
>
> Leakage current typically gets higher with higher frequencies, but
> it's also highly process dependent AFAIK.
>
In general, you can assume leakage power ~ V^2.
> If switching power dissipation is the main factor in power use, then
> we can essentially assume that P ~ V^2, at the same frequency - and
> scales linearly with frequency - but real work performed also scales
> semi-linearly with frequency for many workloads, so that's an
> invariant for everything except highly memory bound workloads.
>
Agreed. Strictly, Energy ~ V^2.
next prev parent reply other threads:[~2014-06-07 23:53 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-23 18:16 [RFC PATCH 00/16] sched: Energy cost model for energy-aware scheduling Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 01/16] sched: Documentation for scheduler energy cost model Morten Rasmussen
2014-06-05 8:49 ` Vincent Guittot
2014-06-05 11:35 ` Morten Rasmussen
2014-06-05 15:02 ` Vincent Guittot
2014-05-23 18:16 ` [RFC PATCH 02/16] sched: Introduce CONFIG_SCHED_ENERGY Morten Rasmussen
2014-06-08 6:03 ` Henrik Austad
2014-06-09 10:20 ` Morten Rasmussen
2014-06-10 9:39 ` Peter Zijlstra
2014-06-10 10:06 ` Morten Rasmussen
2014-06-10 10:23 ` Peter Zijlstra
2014-06-10 11:17 ` Henrik Austad
2014-06-10 12:19 ` Peter Zijlstra
2014-06-10 11:24 ` Morten Rasmussen
2014-06-10 12:24 ` Peter Zijlstra
2014-06-10 14:41 ` Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 03/16] sched: Introduce sd energy data structures Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 04/16] sched: Allocate and initialize sched energy Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 05/16] sched: Add sd energy procfs interface Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 06/16] arm: topology: Define TC2 sched energy and provide it to scheduler Morten Rasmussen
2014-05-30 12:04 ` Peter Zijlstra
2014-06-02 14:15 ` Morten Rasmussen
2014-06-03 11:41 ` Peter Zijlstra
2014-06-04 13:49 ` Morten Rasmussen
2014-06-03 11:44 ` Peter Zijlstra
2014-06-04 15:42 ` Morten Rasmussen
2014-06-04 16:16 ` Peter Zijlstra
2014-06-06 13:15 ` Morten Rasmussen
2014-06-06 13:43 ` Peter Zijlstra
2014-06-06 14:29 ` Morten Rasmussen
2014-06-12 15:05 ` Vince Weaver
2014-06-03 11:50 ` Peter Zijlstra
2014-06-04 16:02 ` Morten Rasmussen
2014-06-04 17:27 ` Peter Zijlstra
2014-06-04 21:56 ` Rafael J. Wysocki
2014-06-05 6:52 ` Peter Zijlstra
2014-06-05 15:03 ` Dirk Brandewie
2014-06-05 20:29 ` Yuyang Du
2014-06-06 8:05 ` Peter Zijlstra
2014-06-06 0:35 ` Yuyang Du
2014-06-06 10:50 ` Peter Zijlstra
2014-06-06 12:13 ` Ingo Molnar
2014-06-06 12:27 ` Ingo Molnar
2014-06-06 14:11 ` Morten Rasmussen
2014-06-07 2:33 ` Nicolas Pitre
2014-06-09 8:27 ` Morten Rasmussen
2014-06-09 13:22 ` Nicolas Pitre
2014-06-11 11:02 ` Eduardo Valentin
2014-06-11 11:42 ` Morten Rasmussen
2014-06-11 11:43 ` Eduardo Valentin
2014-06-11 13:37 ` Morten Rasmussen
2014-06-07 23:53 ` Yuyang Du [this message]
2014-06-07 23:26 ` Yuyang Du
2014-06-09 8:59 ` Morten Rasmussen
2014-06-09 2:15 ` Yuyang Du
2014-06-10 10:16 ` Peter Zijlstra
2014-06-10 17:01 ` Nicolas Pitre
2014-06-10 18:35 ` Yuyang Du
2014-06-06 16:27 ` Jacob Pan
2014-06-06 13:03 ` Morten Rasmussen
2014-06-07 2:52 ` Nicolas Pitre
2014-05-23 18:16 ` [RFC PATCH 07/16] sched: Introduce system-wide sched_energy Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 08/16] sched: Introduce SD_SHARE_CAP_STATES sched_domain flag Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 09/16] sched, cpufreq: Introduce current cpu compute capacity into scheduler Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 10/16] sched, cpufreq: Current compute capacity hack for ARM TC2 Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 11/16] sched: Energy model functions Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 12/16] sched: Task wakeup tracking Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 13/16] sched: Take task wakeups into account in energy estimates Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 14/16] sched: Use energy model in select_idle_sibling Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 15/16] sched: Use energy to guide wakeup task placement Morten Rasmussen
2014-05-23 18:16 ` [RFC PATCH 16/16] sched: Disable wake_affine to broaden the scope of wakeup target cpus Morten Rasmussen
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