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

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Message-ID: <20170714162619.GJ3441@tassilo.jf.intel.com>
Date:   Fri, 14 Jul 2017 09:26:19 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
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,
        arjan@...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

> And as said; Daniel has been working on a better predictor -- now he's
> probably not used it on the network workload you're looking at, so that
> might be something to consider.

Deriving a better idle predictor is a bit orthogonal to fast idle.

It would be a good idea to set the fast idle threshold to be the
same as intel_idle would use on that platform and rerun the benchmarks 

Then the Cx pattern should be mostly identical, and fast idle can be
evaluated on its own benefits.

-Andi