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Date: Tue, 18 Jul 2017 11:23:36 +0800 From: "Li, Aubrey" <aubrey.li@...ux.intel.com> To: Arjan van de Ven <arjan@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, Andi Kleen <ak@...ux.intel.com> Cc: 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 2017/7/18 3:48, 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 > > http://git.fenrus.org/tmp/linux2.png > > This does not look like a Gaussian, does it? I mean abs(expected - actual). Thanks, -Aubrey
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