linux-kernel - Re: [RFC/RFT] [PATCH 10/10] cpufreq: intel

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Message-ID: <1526518361.8766.1.camel@linux.intel.com>
Date:   Wed, 16 May 2018 17:52:41 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     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,
        juri.lelli@....com, linux-kernel@...r.kernel.org
Subject: Re: [RFC/RFT] [PATCH 10/10] cpufreq: intel_pstate: enable boost for
 SKX

On Wed, 2018-05-16 at 17:54 +0200, Peter Zijlstra wrote:
> On Wed, May 16, 2018 at 08:46:24AM -0700, Srinivas Pandruvada wrote:
> > On Wed, 2018-05-16 at 09:49 +0200, Peter Zijlstra wrote:
> > > On Tue, May 15, 2018 at 09:49:11PM -0700, Srinivas Pandruvada
> > > wrote:
> > > > Enable HWP boost on Skylake server platform.
> > > 
> > > Why not unconditionally enable it on everything HWP ?
> > 
> > Never noticed in any difference performance in clients with HWP nor
> > anybody complained. Since clients uses single power domain, some
> > other
> > CPUs always gives boost. 
> 
> Can't the hardware tell us about per-core stuff? Do we really have to
> use tables for that?
AFAIK not in a standard way across all platforms. But I will check on
this.