linux-kernel - Re: [RFC/RFT] [PATCH 02/10] cpufreq: intel_pstate: Conditional frequency invariant accounting

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Message-ID: <20180516154733.GF12198@hirez.programming.kicks-ass.net>
Date:   Wed, 16 May 2018 17:47:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        tglx@...utronix.de, mingo@...hat.com, bp@...e.de, lenb@...nel.org,
        rjw@...ysocki.net, mgorman@...hsingularity.net, x86@...nel.org,
        linux-pm@...r.kernel.org, viresh.kumar@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC/RFT] [PATCH 02/10] cpufreq: intel_pstate: Conditional
 frequency invariant accounting

On Wed, May 16, 2018 at 05:19:25PM +0200, Juri Lelli wrote:

> Anyway, FWIW I started testing this on a E5-2609 v3 and I'm not seeing
> hackbench regressions so far (running with schedutil governor).

https://en.wikipedia.org/wiki/Haswell_(microarchitecture)#Server_processors

Lists the E5 2609 v3 as not having turbo at all, which is basically a
best case scenario for this patch.

As I wrote earlier today; when turbo exists, like say the 2699, then
when we're busy we'll run at U=2.3/3.6 ~ .64, which might confuse
things.