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

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Message-ID: <dd8f283b-a869-dbdb-f77e-659eb2c878ce@linux.intel.com>
Date:   Mon, 17 Jul 2017 12:48:38 -0700
From:   Arjan van de Ven <arjan@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Andi Kleen <ak@...ux.intel.com>
Cc:     "Li, Aubrey" <aubrey.li@...ux.intel.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Aubrey Li <aubrey.li@...el.com>, tglx@...utronix.de,
        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 12:23 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

http://git.fenrus.org/tmp/linux2.png