From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Eero Tamminen <eero.t.tamminen@intel.com>,
Mel Gorman <mgorman@techsingularity.net>,
Francisco Jerez <currojerez@riseup.net>,
lenb@kernel.org, rjw@rjwysocki.net, ggherdovich@suse.cz,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
juri.lelli@redhat.com, viresh.kumar@linaro.org,
Chris Wilson <chris@chris-wilson.co.uk>,
Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Subject: Re: [PATCH 4/4] cpufreq: intel_pstate: enable boost for Skylake Xeon
Date: Tue, 31 Jul 2018 12:07:08 -0700 [thread overview]
Message-ID: <41b51613acbdaf59294f436af057753978908470.camel@linux.intel.com> (raw)
In-Reply-To: <20180731150438.GE2458@hirez.programming.kicks-ass.net>
On Tue, 2018-07-31 at 17:04 +0200, Peter Zijlstra wrote:
> On Mon, Jul 30, 2018 at 07:06:21AM -0700, Srinivas Pandruvada wrote:
> > On Mon, 2018-07-30 at 14:16 +0300, Eero Tamminen wrote:
> > > Questions:
> > >
> > > * Does currently kernel CPU freq management have any idea which
> > > IO
> > > devices share TDP with the CPU cores?
> > No. The requests we do to hardware is just indication only (HW can
> > ignore it). The HW has a bias register to adjust and distribute
> > power
> > among users.
> > We can have several other active device on servers beside CPU which
> > when runs need extra power. So the HW arbitrates power.
>
> That's not entirely accurate AFAIK. "No" is accurate for Intel, but
> the
> ARM people have their IPA thing (not a beer):
We also have that for using space programs (E.g. KBL-G).
Thanks,
Srinivas
>
> https://developer.arm.com/open-source/intelligent-power-allocation
>
> drivers/thermal/power_allocator.c
>
> which IIUC interacts with their cpufreq driver to disallow certain
> OPP
> states.
>
> And note that I discourage intel_pstate active mode.
next prev parent reply other threads:[~2018-07-31 19:07 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-05 21:42 [PATCH 0/4] Intel_pstate: HWP Dynamic performance boost Srinivas Pandruvada
2018-06-05 21:42 ` [PATCH 1/4] cpufreq: intel_pstate: Add HWP boost utility and sched util hooks Srinivas Pandruvada
2018-06-05 21:42 ` [PATCH 2/4] cpufreq: intel_pstate: HWP boost performance on IO wakeup Srinivas Pandruvada
2018-06-05 21:42 ` [PATCH 3/4] cpufreq: intel_pstate: New sysfs entry to control HWP boost Srinivas Pandruvada
2018-06-05 21:42 ` [PATCH 4/4] cpufreq: intel_pstate: enable boost for Skylake Xeon Srinivas Pandruvada
2018-07-28 5:34 ` Francisco Jerez
2018-07-28 12:36 ` Mel Gorman
2018-07-28 20:21 ` Francisco Jerez
2018-07-30 15:43 ` Mel Gorman
2018-07-30 15:57 ` Srinivas Pandruvada
2018-07-30 18:32 ` Francisco Jerez
2018-07-31 7:10 ` Giovanni Gherdovich
2018-08-01 6:52 ` Francisco Jerez
2018-07-30 11:16 ` Eero Tamminen
2018-07-30 14:06 ` Srinivas Pandruvada
2018-07-31 15:04 ` Peter Zijlstra
2018-07-31 19:07 ` Srinivas Pandruvada [this message]
2018-07-28 14:14 ` Srinivas Pandruvada
2018-07-28 20:23 ` Francisco Jerez
[not found] ` <9828ba535fcdce8458593013fd1c67385a8fefb9.camel@intel.com>
2018-07-28 20:23 ` Francisco Jerez
2018-07-28 22:06 ` Pandruvada, Srinivas
2018-07-30 8:33 ` Eero Tamminen
2018-07-30 13:38 ` Srinivas Pandruvada
2018-06-12 15:04 ` [PATCH 0/4] Intel_pstate: HWP Dynamic performance boost Rafael J. Wysocki
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