From: Julia Lawall <julia.lawall@inria.fr>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Julia Lawall <julia.lawall@inria.fr>,
Francisco Jerez <currojerez@riseup.net>,
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
Len Brown <lenb@kernel.org>,
Viresh Kumar <viresh.kumar@linaro.org>,
Linux PM <linux-pm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: Re: cpufreq: intel_pstate: map utilization into the pstate range
Date: Thu, 30 Dec 2021 19:44:06 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2112301942360.15550@hadrien> (raw)
In-Reply-To: <CAJZ5v0haa5QWvTUUg+wwSHvuWyk8pic1N0kox=E1ZKNrHSFuzw@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 3647 bytes --]
On Thu, 30 Dec 2021, Rafael J. Wysocki wrote:
> On Thu, Dec 30, 2021 at 7:21 PM Julia Lawall <julia.lawall@inria.fr> wrote:
> >
> >
> >
> > On Thu, 30 Dec 2021, Rafael J. Wysocki wrote:
> >
> > > On Thu, Dec 30, 2021 at 6:54 PM Julia Lawall <julia.lawall@inria.fr> wrote:
> > > >
> > > > > > The effect is the same. But that approach is indeed simpler than patching
> > > > > > the kernel.
> > > > >
> > > > > It is also applicable when intel_pstate runs in the active mode.
> > > > >
> > > > > As for the results that you have reported, it looks like the package
> > > > > power on these systems is dominated by package voltage and going from
> > > > > P-state 20 to P-state 21 causes that voltage to increase significantly
> > > > > (the observed RAM energy usage pattern is consistent with that). This
> > > > > means that running at P-states above 20 is only really justified if
> > > > > there is a strict performance requirement that can't be met otherwise.
> > > > >
> > > > > Can you please check what value is there in the base_frequency sysfs
> > > > > attribute under cpuX/cpufreq/?
> > > >
> > > > 2100000, which should be pstate 21
> > > >
> > > > >
> > > > > I'm guessing that the package voltage level for P-states 10 and 20 is
> > > > > the same, so the power difference between them is not significant
> > > > > relative to the difference between P-state 20 and 21 and if increasing
> > > > > the P-state causes some extra idle time to appear in the workload
> > > > > (even though there is not enough of it to prevent to overall
> > > > > utilization from increasing), then the overall power draw when running
> > > > > at P-state 10 may be greater that for P-state 20.
> > > >
> > > > My impression is that the package voltage level for P-states 10 to 20 is
> > > > high enough that increasing the frequency has little impact. But the code
> > > > runs twice as fast, which reduces the execution time a lot, saving energy.
> > > >
> > > > My first experiment had only one running thread. I also tried running 32
> > > > spinning threads for 10 seconds, ie using up one package and leaving the
> > > > other idle. In this case, instead of staying around 600J for pstates
> > > > 10-20, the pstate rises from 743 to 946. But there is still a gap between
> > > > 20 and 21, with 21 being 1392J.
> > > >
> > > > > You can check if there is any C-state residency difference between
> > > > > these two cases by running the workload under turbostat in each of
> > > > > them.
> > > >
> > > > The C1 and C6 cases (CPU%c1 and CPU%c6) are about the same between 20 and
> > > > 21, whether with 1 thread or with 32 thread.
> > >
> > > I meant to compare P-state 10 and P-state 20.
> > >
> > > 20 and 21 are really close as far as the performance is concerned, so
> > > I wouldn't expect to see any significant C-state residency difference
> > > between them.
> >
> > There's also no difference between 10 and 20. This seems normal, because
> > the same cores are either fully used or fully idle in both cases. The
> > idle ones are almost always in C6.
>
> The turbostat output sent by you previously shows that the CPUs doing
> the work are only about 15-or-less percent busy, though, and you get
> quite a bit of C-state residency on them. I'm assuming that this is
> for 1 running thread.
>
> Can you please run the 32 spinning threads workload (ie. on one
> package) and with P-state locked to 10 and then to 20 under turbostat
> and send me the turbostat output for both runs?
Attached.
Pstate 10: spin_minmax_10_dahu-9_5.15.0freq_schedutil_11.turbo
Pstate 20: spin_minmax_20_dahu-9_5.15.0freq_schedutil_11.turbo
julia
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10.041290 sec
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next prev parent reply other threads:[~2021-12-30 18:44 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-13 22:52 cpufreq: intel_pstate: map utilization into the pstate range Julia Lawall
2021-12-17 18:36 ` Rafael J. Wysocki
2021-12-17 19:32 ` Julia Lawall
2021-12-17 20:36 ` Francisco Jerez
[not found] ` <alpine.DEB.2.22.394.2112172258480.2968@hadrien>
2021-12-18 0:04 ` Francisco Jerez
2021-12-18 6:12 ` Julia Lawall
2021-12-18 10:19 ` Francisco Jerez
2021-12-18 11:07 ` Julia Lawall
2021-12-18 22:12 ` Francisco Jerez
2021-12-19 6:42 ` Julia Lawall
2021-12-19 14:19 ` Rafael J. Wysocki
2021-12-19 14:30 ` Rafael J. Wysocki
2021-12-19 22:10 ` Francisco Jerez
[not found] ` <alpine.DEB.2.22.394.2112192312520.3181@hadrien>
2021-12-19 23:31 ` Francisco Jerez
2021-12-21 17:04 ` Rafael J. Wysocki
2021-12-21 23:56 ` Francisco Jerez
2021-12-22 14:54 ` Rafael J. Wysocki
2021-12-24 11:08 ` Julia Lawall
2021-12-28 16:58 ` Julia Lawall
2021-12-28 17:40 ` Rafael J. Wysocki
2021-12-28 17:46 ` Julia Lawall
2021-12-28 18:06 ` Rafael J. Wysocki
2021-12-28 18:16 ` Julia Lawall
2021-12-29 9:13 ` Julia Lawall
2021-12-30 17:03 ` Rafael J. Wysocki
2021-12-30 17:54 ` Julia Lawall
2021-12-30 17:58 ` Rafael J. Wysocki
2021-12-30 18:20 ` Julia Lawall
2021-12-30 18:37 ` Rafael J. Wysocki
2021-12-30 18:44 ` Julia Lawall [this message]
2022-01-03 15:50 ` Rafael J. Wysocki
2022-01-03 16:41 ` Julia Lawall
2022-01-03 18:23 ` Julia Lawall
2022-01-03 19:58 ` Rafael J. Wysocki
2022-01-03 20:51 ` Julia Lawall
2022-01-04 14:09 ` Rafael J. Wysocki
2022-01-04 15:49 ` Julia Lawall
2022-01-04 19:22 ` Rafael J. Wysocki
2022-01-05 20:19 ` Julia Lawall
2022-01-05 23:46 ` Francisco Jerez
2022-01-06 19:49 ` Julia Lawall
2022-01-06 20:28 ` Srinivas Pandruvada
2022-01-06 20:43 ` Julia Lawall
2022-01-06 21:55 ` srinivas pandruvada
2022-01-06 21:58 ` Julia Lawall
2022-01-05 0:38 ` Francisco Jerez
2021-12-19 14:14 ` Rafael J. Wysocki
2021-12-19 17:03 ` Julia Lawall
2021-12-19 22:30 ` Francisco Jerez
2021-12-21 18:10 ` Rafael J. Wysocki
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