linux-kernel - Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods

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Message-ID: <4fd3c407-2bb1-9b87-1cc4-b1c6012bf8a3@linux.intel.com>
Date:   Mon, 17 Jul 2017 12:55:33 -0700
From:   Arjan van de Ven <arjan@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>,
        "Li, Aubrey" <aubrey.li@...ux.intel.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Aubrey Li <aubrey.li@...el.com>, len.brown@...el.com,
        rjw@...ysocki.net, tim.c.chen@...ux.intel.com,
        paulmck@...ux.vnet.ibm.com, yang.zhang.wz@...il.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        daniel.lezcano@...aro.org
Subject: Re: [RFC PATCH v1 00/11] Create fast idle path for short idle periods

On 7/17/2017 12:53 PM, Thomas Gleixner wrote:
> On Mon, 17 Jul 2017, Arjan van de Ven wrote:
>> On 7/17/2017 12:23 PM, Peter Zijlstra wrote:
>>> Of course, this all assumes a Gaussian distribution to begin with, if we
>>> get bimodal (or worse) distributions we can still get it wrong. To fix
>>> that, we'd need to do something better than what we currently have.
>>>
>>
>> fwiw some time ago I made a chart for predicted vs actual so you can sort
>> of judge the distribution of things visually
>
> Predicted by what?

this chart was with the current linux predictor

http://git.fenrus.org/tmp/timer.png is what you get if you JUST use the next timer ;-)
(which way back linux was doing)