From: Peter Zijlstra <peterz@infradead.org>
To: Francisco Jerez <currojerez@riseup.net>
Cc: intel-gfx@lists.freedesktop.org, linux-pm@vger.kernel.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Eero Tamminen <eero.t.tamminen@intel.com>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Subject: Re: [PATCH 0/9] GPU-bound energy efficiency improvements for the intel_pstate driver.
Date: Fri, 13 Apr 2018 20:15:37 +0200 [thread overview]
Message-ID: <20180413181537.GS4064@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <87a7u842tg.fsf@riseup.net>
On Thu, Apr 12, 2018 at 12:55:39PM -0700, Francisco Jerez wrote:
> Actually assuming that a single geometric feature of the power curve is
> known -- it being convex in the frequency range allowed by the policy
> (which is almost always the case, not only for Intel CPUs), the optimal
> frequency for an IO-bound workload is fully independent of the exact
> power curve -- It's just the minimum CPU frequency that's able to keep
> the bottlenecking IO device at 100% utilization.
I think that is difficult to determine with the information at hand. We
have lost all device information by the time we reach the scheduler.
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next prev parent reply other threads:[~2018-04-13 18:15 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-28 6:38 [PATCH 0/9] GPU-bound energy efficiency improvements for the intel_pstate driver Francisco Jerez
2018-03-28 6:38 ` [PATCH 1/9] cpufreq: Implement infrastructure keeping track of aggregated IO active time Francisco Jerez
2018-03-28 6:38 ` [PATCH 2/9] Revert "cpufreq: intel_pstate: Replace bxt_funcs with core_funcs" Francisco Jerez
2018-03-28 6:38 ` [PATCH 3/9] Revert "cpufreq: intel_pstate: Shorten a couple of long names" Francisco Jerez
2018-03-28 6:38 ` [PATCH 4/9] Revert "cpufreq: intel_pstate: Simplify intel_pstate_adjust_pstate()" Francisco Jerez
2018-03-28 6:38 ` [PATCH 5/9] Revert "cpufreq: intel_pstate: Drop ->update_util from pstate_funcs" Francisco Jerez
2018-03-28 6:38 ` [PATCH 6/9] cpufreq/intel_pstate: Implement variably low-pass filtering controller for small core Francisco Jerez
2018-03-28 6:38 ` [PATCH 7/9] SQUASH: cpufreq/intel_pstate: Enable LP controller based on ACPI FADT profile Francisco Jerez
2018-03-28 6:38 ` [PATCH 8/9] OPTIONAL: cpufreq/intel_pstate: Expose LP controller parameters via debugfs Francisco Jerez
2018-03-28 6:38 ` [PATCH 9/9] drm/i915/execlists: Report GPU rendering as IO activity to cpufreq Francisco Jerez
2018-03-28 8:02 ` Chris Wilson
2018-03-28 18:55 ` Francisco Jerez
2018-03-28 19:20 ` Chris Wilson
2018-03-28 23:19 ` Chris Wilson
2018-03-29 0:32 ` Francisco Jerez
2018-03-29 1:01 ` Chris Wilson
2018-03-29 1:20 ` Chris Wilson
2018-03-30 18:50 ` [PATCH 0/9] GPU-bound energy efficiency improvements for the intel_pstate driver Francisco Jerez
2018-04-10 22:28 ` Francisco Jerez
2018-04-11 3:14 ` Srinivas Pandruvada
2018-04-11 16:10 ` Francisco Jerez
2018-04-11 16:26 ` Francisco Jerez
2018-04-11 17:35 ` Juri Lelli
2018-04-12 21:38 ` Francisco Jerez
2018-04-12 6:17 ` Srinivas Pandruvada
2018-04-14 2:00 ` Francisco Jerez
2018-04-14 4:01 ` Srinivas Pandruvada
2018-04-16 14:04 ` Eero Tamminen
2018-04-16 17:27 ` Srinivas Pandruvada
2018-04-12 8:58 ` Peter Zijlstra
2018-04-12 18:34 ` Francisco Jerez
2018-04-12 19:33 ` Peter Zijlstra
2018-04-12 19:55 ` Francisco Jerez
2018-04-13 18:15 ` Peter Zijlstra [this message]
2018-04-14 1:57 ` Francisco Jerez
2018-04-14 9:49 ` Peter Zijlstra
2018-04-17 14:03 ` Chris Wilson
2018-04-17 15:34 ` Srinivas Pandruvada
2018-04-17 19:27 ` Francisco Jerez
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