From: Lukasz Luba <lukasz.luba@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
Chris Redpath <Chris.Redpath@arm.com>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Morten Rasmussen <morten.rasmussen@arm.com>,
Quentin Perret <qperret@google.com>,
"open list:THERMAL" <linux-pm@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
segall@google.com, Mel Gorman <mgorman@suse.de>,
Daniel Bristot de Oliveira <bristot@redhat.com>,
CCj.Yeh@mediatek.com
Subject: Re: [PATCH 1/3] sched/fair: Prepare variables for increased precision of EAS estimated energy
Date: Wed, 7 Jul 2021 11:41:16 +0100 [thread overview]
Message-ID: <58cb7ad3-ffff-8940-4c8e-2c46dcc86d54@arm.com> (raw)
In-Reply-To: <CAKfTPtAN6-ytxa2Qj3=z27e8ZBoqGrWAZce9CojL3wbZSotUsQ@mail.gmail.com>
On 7/7/21 11:32 AM, Vincent Guittot wrote:
> On Wed, 7 Jul 2021 at 12:29, Lukasz Luba <lukasz.luba@arm.com> wrote:
>>
>>
>>
>> On 7/7/21 11:11 AM, Vincent Guittot wrote:
>>> On Wed, 7 Jul 2021 at 12:06, Lukasz Luba <lukasz.luba@arm.com> wrote:
>>>>
>>
>> [snip]
>>
>>>> No. It's in 0.1uW scale, so 800Watts. Which is 16 CPUs * 64Watts
>>>
>>> Oh! you want 0.1uW precision .... This doesn't seem realistic at all.
>>> I'm not even sure that the power model can even reach an accuracy of
>>> 1mW
>>>
>>
>> True, the EM is registering platform with 1mW precision, but 1uW
>
> Do you mean 1uW or 0.1uW ?
In this patch set I've proposed 0.1uW, but I'm open to drop one
order of magnitude. The 1uW still be good.
next prev parent reply other threads:[~2021-07-07 10:41 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-25 15:26 [PATCH 0/3] Improve EAS energy estimation and increase precision Lukasz Luba
2021-06-25 15:26 ` [PATCH 1/3] sched/fair: Prepare variables for increased precision of EAS estimated energy Lukasz Luba
2021-06-30 17:01 ` Rafael J. Wysocki
2021-06-30 17:28 ` Lukasz Luba
2021-07-02 19:07 ` Lukasz Luba
2021-07-07 7:07 ` Vincent Guittot
2021-07-07 7:49 ` Lukasz Luba
2021-07-07 8:00 ` Vincent Guittot
2021-07-07 8:23 ` Lukasz Luba
2021-07-07 9:37 ` Vincent Guittot
2021-07-07 9:48 ` Lukasz Luba
2021-07-07 9:56 ` Vincent Guittot
2021-07-07 10:06 ` Lukasz Luba
2021-07-07 10:11 ` Vincent Guittot
2021-07-07 10:29 ` Lukasz Luba
2021-07-07 10:32 ` Vincent Guittot
2021-07-07 10:41 ` Lukasz Luba [this message]
2021-07-07 10:50 ` Vincent Guittot
2021-07-07 11:02 ` Lukasz Luba
2021-07-07 13:53 ` Vincent Guittot
2021-07-07 14:25 ` Lukasz Luba
2021-07-07 9:45 ` Dietmar Eggemann
2021-07-07 9:54 ` Lukasz Luba
2021-06-25 15:26 ` [PATCH 2/3] PM: EM: Make em_cpu_energy() able to return bigger values Lukasz Luba
2021-07-05 12:44 ` Dietmar Eggemann
2021-07-06 19:44 ` Lukasz Luba
2021-07-07 7:07 ` Peter Zijlstra
2021-07-07 8:09 ` Lukasz Luba
2021-07-07 10:01 ` Peter Zijlstra
2021-07-07 10:23 ` Lukasz Luba
2021-06-25 15:26 ` [PATCH 3/3] PM: EM: Increase energy calculation precision Lukasz Luba
2021-07-05 12:45 ` Dietmar Eggemann
2021-07-06 19:51 ` Lukasz Luba
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