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From: "Doug Smythies" <dsmythies@telus.net>
To: "'Giovanni Gherdovich'" <ggherdovich@suse.cz>,
	"'Srinivas Pandruvada'" <srinivas.pandruvada@linux.intel.com>,
	"'Thomas Gleixner'" <tglx@linutronix.de>,
	"'Ingo Molnar'" <mingo@redhat.com>,
	"'Peter Zijlstra'" <peterz@infradead.org>,
	"'Borislav Petkov'" <bp@suse.de>, "'Len Brown'" <lenb@kernel.org>,
	"'Rafael J . Wysocki'" <rjw@rjwysocki.net>
Cc: <x86@kernel.org>, <linux-pm@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	"'Mel Gorman'" <mgorman@techsingularity.net>,
	"'Matt Fleming'" <matt@codeblueprint.co.uk>,
	"'Viresh Kumar'" <viresh.kumar@linaro.org>,
	"'Juri Lelli'" <juri.lelli@redhat.com>,
	"'Paul Turner'" <pjt@google.com>,
	"'Vincent Guittot'" <vincent.guittot@linaro.org>,
	"'Quentin Perret'" <qperret@qperret.net>,
	"'Dietmar Eggemann'" <dietmar.eggemann@arm.com>
Subject: RE: [PATCH v4 1/6] x86,sched: Add support for frequency invariance
Date: Mon, 25 Nov 2019 21:59:19 -0800
Message-ID: <000801d5a41e$a7fce2c0$f7f6a840$@net> (raw)
In-Reply-To: <1574697961.16378.5.camel@suse.cz>

On 2019.11.25 08:06 Giovanni Gherdovich wrote:
> On Sat, 2019-11-23 at 23:49 -0800, Doug Smythies wrote:
>> ...
>> Kernel 5.4-rc8 + revert, intel_cpufreq/schedutil: 3899 seconds
>> Kernel 5.4-rc8 + gg 6 + revert, intel_cpufreq/schedutil: 2740.7 seconds
>> Ratio: 0.70 (as expected)
>> Kernel 5.4-rc8, intel_cpufreq/schedutil: 2334.7 seconds (faster than expected)
>> Kernel 5.4-rc8 + gg 6 patch set, intel_cpufreq/schedutil: 2275.0 seconds (faster than expected)
>> Ratio: 0.97 (not as expected)
>> Kernel 5.4-rc8, intel_cpufreq/performance: 2215.3 seconds
>> Kernel 5.4-rc8, intel_cpufreq/ondemand: 3286.3 seconds
>> Re-stated from previous e-mail:
>> Kernel 5.3-rc8, intel_cpufreq/schedutil: ratio: 0.69 (I don't have the original times)
>
> Hello Doug,
>
> schedutil in 5.4 going a lot faster than in 5.3 would be a surprise. I'm
> running that same test too to check if I can see it as well.

Great, thanks. But see below.

>
> Besides, as it's already been said this patchset adds frequency
> scale-invariance to scheduler metrics such as load and utilization and that's
> useful also in areas other than frequency scaling (most notably the scheduler
> load balancer).

The issue with the schedutil governor not working properly in the 5.4 RC series
appears to be hardware dependant.

My test computer is Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz., Sandy Bridge.
On a temporary basis, I acquired a computer with an
Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz, Haswell,
and schedutil governor behaviour with the exact same kernels is fine:

That "gitsource" test, "make test" 6 times, first run thrown out:

Kernel 5.4 intel_cpufreq/schedutil: 3411.8 seconds
Kernel 5.4 + gg 6 intel_cpufreq/schedutil: 1696.7 seconds
Ratio: 0.49
Recall you got a ratio of 0.49 with 5th generation, Broadwell.

... Doug



  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-13 12:46 [PATCH v4 0/6] Add support for frequency invariance for (some) x86 Giovanni Gherdovich
2019-11-13 12:46 ` [PATCH v4 1/6] x86,sched: Add support for frequency invariance Giovanni Gherdovich
2019-11-24  7:49   ` Doug Smythies
2019-11-25  8:16     ` Doug Smythies
2019-11-25  9:16     ` Mel Gorman
2019-11-25 16:06     ` Giovanni Gherdovich
2019-11-26  5:59       ` Doug Smythies [this message]
2019-11-26 15:20         ` Giovanni Gherdovich
2019-11-27  7:32           ` Doug Smythies
2019-11-28 22:48             ` Doug Smythies
2019-12-19 10:48               ` Qais Yousef
2019-12-23  7:47                 ` Doug Smythies
2019-12-23 14:07                   ` Qais Yousef
2019-12-23 14:40                     ` Qais Yousef
2019-12-23 16:34                       ` Doug Smythies
2019-12-23 19:10                         ` Qais Yousef
2019-12-24  1:16                           ` Doug Smythies
2019-12-24 11:08                             ` Qais Yousef
2019-12-02 16:34   ` Ionela Voinescu
2019-12-06 11:57     ` Giovanni Gherdovich
2019-12-18 19:34       ` Peter Zijlstra
2019-12-19 20:27         ` Giovanni Gherdovich
2019-11-13 12:46 ` [PATCH v4 2/6] x86,sched: Add support for frequency invariance on SKYLAKE_X Giovanni Gherdovich
2019-12-18 20:06   ` Peter Zijlstra
2019-12-19 20:29     ` Giovanni Gherdovich
2019-11-13 12:46 ` [PATCH v4 3/6] x86,sched: Add support for frequency invariance on XEON_PHI_KNL/KNM Giovanni Gherdovich
2019-12-18 20:22   ` Peter Zijlstra
2019-12-19 20:32     ` Giovanni Gherdovich
2019-11-13 12:46 ` [PATCH v4 4/6] x86,sched: Add support for frequency invariance on ATOM_GOLDMONT* Giovanni Gherdovich
2019-11-13 12:46 ` [PATCH v4 5/6] x86,sched: Add support for frequency invariance on ATOM Giovanni Gherdovich
2019-11-13 16:50   ` Srinivas Pandruvada
2019-11-15 10:34     ` Giovanni Gherdovich
2019-11-13 12:46 ` [PATCH v4 6/6] x86: intel_pstate: handle runtime turbo disablement/enablement in freq. invariance Giovanni Gherdovich
2019-12-18 20:37 ` [PATCH v4 0/6] Add support for frequency invariance for (some) x86 Peter Zijlstra
2019-12-19 20:33   ` Giovanni Gherdovich

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