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From: "Doug Smythies" <dsmythies@telus.net>
To: "'Rafael J. Wysocki'" <rjw@rjwysocki.net>
Cc: "'Linux Documentation'" <linux-doc@vger.kernel.org>,
	"'LKML'" <linux-kernel@vger.kernel.org>,
	"'Peter Zijlstra'" <peterz@infradead.org>,
	"'Srinivas Pandruvada'" <srinivas.pandruvada@linux.intel.com>,
	"'Giovanni Gherdovich'" <ggherdovich@suse.cz>,
	"'Francisco Jerez'" <francisco.jerez.plata@intel.com>,
	"'Viresh Kumar'" <viresh.kumar@linaro.org>,
	"'Linux PM'" <linux-pm@vger.kernel.org>
Subject: RE: [PATCH v7] cpufreq: intel_pstate: Implement passive mode with HWP enabled
Date: Sun, 6 Sep 2020 17:16:32 -0700
Message-ID: <000401d684ac$26ee4880$74cad980$@net> (raw)
In-Reply-To: <000901d674da$4521bda0$cf6538e0$@net>

Hi Rafael,

On 2020.08.17 14:06 Doug Smythies wrote:
> On 2020.08.06 05:04 Rafael J. Wysocki wrote:
> 
> > Allow intel_pstate to work in the passive mode with HWP enabled and
> > make it set the HWP minimum performance limit (HWP floor) to the
> > P-state value given by the target frequency supplied by the cpufreq
> > governor, so as to prevent the HWP algorithm and the CPU scheduler
> > from working against each other, at least when the schedutil governor
> > is in use, and update the intel_pstate documentation accordingly.
> 
...
> 
> powersave governor:
> acpi-cpufreq: good
> intel_cpufreq hwp: bad
> intel_cpufreq no hwp: good

It occurs to me that my expectations as to what 
is meant by "powersave" might not agree with yours. 

For the powersave governor, this is what we have now:

intel_cpufreq hwp == intel_pstate hwp
intel_cpufreq no hwp == acpi-cpufreq == always minimum freq
intel_pstate no hwp ~= acpi-cpufreq/ondemand

Is that your understanding/intention?

My expectation was/is:

intel_cpufreq hwp == intel_cpufreq no hwp == acpi-cpufreq == always minimum freq
intel_pstate no hwp ~= acpi-cpufreq/ondemand
intel_pstate hwp == Unique. Say, extremely course version of ondemand.

... Doug



      reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-16 17:37 [PATCH v2 0/2] " Rafael J. Wysocki
2020-07-16 17:38 ` [PATCH v2 1/2] cpufreq: intel_pstate: Rearrange the storing of newv EPP values Rafael J. Wysocki
2020-07-16 17:42 ` [PATCH v2 2/2] cpufreq: intel_pstate: Implement passive mode with HWP enabled Rafael J. Wysocki
2020-07-27 15:13 ` [PATCH v3 0/2] " Rafael J. Wysocki
2020-07-27 15:15   ` [PATCH v3 1/2] cpufreq: intel_pstate: Rearrange the storing of new EPP values Rafael J. Wysocki
2020-07-27 15:17   ` [PATCH v3 2/2] cpufreq: intel_pstate: Implement passive mode with HWP enabled Rafael J. Wysocki
2020-07-28 15:09   ` [PATCH v4 0/2] " Rafael J. Wysocki
2020-07-28 15:11     ` [PATCH v4 1/2] cpufreq: intel_pstate: Rearrange the storing of new EPP values Rafael J. Wysocki
2020-07-30  1:31       ` Francisco Jerez
2020-07-28 15:13     ` [PATCH v4 2/2] cpufreq: intel_pstate: Implement passive mode with HWP enabled Rafael J. Wysocki
2020-08-01 23:21       ` Srinivas Pandruvada
2020-08-02 14:14         ` Doug Smythies
2020-08-02 19:20           ` Srinivas Pandruvada
2020-08-03 17:17       ` [PATCH v5] " Rafael J. Wysocki
2020-08-01 16:39     ` [PATCH v4 0/2] " Srinivas Pandruvada
2020-08-02 14:00       ` Doug Smythies
2020-08-02 18:39         ` Srinivas Pandruvada
2020-08-03  0:26           ` Doug Smythies
2020-08-03 17:23       ` Rafael J. Wysocki
2020-08-04 15:10   ` [PATCH v6] " Rafael J. Wysocki
2020-08-04 17:04     ` Doug Smythies
2020-08-05  9:34       ` Rafael J. Wysocki
2020-08-05 15:38         ` Srinivas Pandruvada
2020-08-05 16:28           ` Rafael J. Wysocki
2020-08-05 16:55   ` [PATCH v7] " Rafael J. Wysocki
2020-08-06  5:55     ` Doug Smythies
2020-08-06 11:25       ` Rafael J. Wysocki
2020-08-06 12:03     ` Rafael J. Wysocki
2020-08-10  0:44       ` Srinivas Pandruvada
2020-08-11  0:51       ` Francisco Jerez
2020-08-11 15:33         ` Rafael J. Wysocki
2020-08-17 21:06       ` Doug Smythies
2020-09-07  0:16         ` Doug Smythies [this message]

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