GNU bug report logs - #37904
CPU overheating on recent laptops

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Package: guix; Reported by: Ludovic Courtès <ludovic.courtes@HIDDEN>; dated Thu, 24 Oct 2019 14:58:02 UTC; Maintainer for guix is bug-guix@HIDDEN.

Message received at 37904 <at> debbugs.gnu.org:


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From: Arne Babenhauserheide <arne_bab@HIDDEN>
To: bug-guix@HIDDEN
Subject: Re: bug#37904: CPU overheating on recent laptops
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>> For laptops and other battery-powered devices, =E2=80=98conservative=E2=
=80=99 is
>> preferred over =E2=80=98ondemand=E2=80=99.  It's probably a sane default=
 choice for
>> all.

> --8<---------------cut here---------------start------------->8---
> $ cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors
> performance powersave

> $ uname -a
> Linux ribbon 5.3.7-gnu #1 SMP 1 x86_64 GNU/Linux
> --8<---------------cut here---------------end--------------->8---
>
> Do you see more governors on your side?  How could that be?

Do you have a recent Intel CPU? From what I know they removed support
for conservative, because their powersave is in fact conservative.

Also they don=E2=80=99t necessarily stick to the frequency you set for them=
. To
ensure that they keep the frequency, I have a script running that sets
the speed every minute:

(define cpupower-powersave-job
  ;; Set the governor to powersave every minute.
  ;; The job's action is a shell command.
  ;; TODO: migrate to clearer syntax:   #~(job '(next-hour '(3)) (string-ap=
pend #$btrfs-progs "/bin/btrfs scrub start -c 3 /")))
  #~(job "* * * * *"            ;Vixie cron syntax
         "cpupower frequency-set -g powersave -u 1200000")) ;; use powersav=
e governor with a maximum frequency of 1200MHz

(this is a problem which also hits other distributions)

Best wishes,
Arne
=2D-
Unpolitisch sein
hei=C3=9Ft politisch sein
ohne es zu merken

--=-=-=
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Information forwarded to bug-guix@HIDDEN:
bug#37904; Package guix. Full text available.

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From: Arne Babenhauserheide <arne_bab@HIDDEN>
To: bug-guix@HIDDEN
Subject: Re: bug#37904: CPU overheating on recent laptops
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--=-=-=
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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>> For laptops and other battery-powered devices, =E2=80=98conservative=E2=
=80=99 is
>> preferred over =E2=80=98ondemand=E2=80=99.  It's probably a sane default=
 choice for
>> all.

> --8<---------------cut here---------------start------------->8---
> $ cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors
> performance powersave

> $ uname -a
> Linux ribbon 5.3.7-gnu #1 SMP 1 x86_64 GNU/Linux
> --8<---------------cut here---------------end--------------->8---
>
> Do you see more governors on your side?  How could that be?

Do you have a recent Intel CPU? From what I know they removed support
for conservative, because their powersave is in fact conservative.

Also they don=E2=80=99t necessarily stick to the frequency you set for them=
. To
ensure that they keep the frequency, I have a script running that sets
the speed every minute:

(define cpupower-powersave-job
  ;; Set the governor to powersave every minute.
  ;; The job's action is a shell command.
  ;; TODO: migrate to clearer syntax:   #~(job '(next-hour '(3)) (string-ap=
pend #$btrfs-progs "/bin/btrfs scrub start -c 3 /")))
  #~(job "* * * * *"            ;Vixie cron syntax
         "cpupower frequency-set -g powersave -u 1200000")) ;; use powersav=
e governor with a maximum frequency of 1200MHz

(this is a problem which also hits other distributions)

Best wishes,
Arne
=2D-
Unpolitisch sein
hei=C3=9Ft politisch sein
ohne es zu merken

--=-=-=
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-----END PGP SIGNATURE-----
--=-=-=--




Information forwarded to bug-guix@HIDDEN:
bug#37904; Package guix. Full text available.

Message received at 37904 <at> debbugs.gnu.org:


Received: (at 37904) by debbugs.gnu.org; 25 Oct 2019 20:50:01 +0000
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@HIDDEN>
Subject: Re: bug#37904: CPU overheating on recent laptops
References: <87a79qfayh.fsf@HIDDEN> <87v9sef6n0.fsf@nckx>
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Hi,

Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@HIDDEN>
skribis:

> Ludovic Court=C3=A8s =E5=86=99=E9=81=93=EF=BC=9A
>> Also, there used to be an =E2=80=9Condemand=E2=80=9D governor, which is =
no longer
>> listed
>> in /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors.
>
> For laptops and other battery-powered devices, =E2=80=98conservative=E2=
=80=99 is
> preferred over =E2=80=98ondemand=E2=80=99.  It's probably a sane default =
choice for
> all.

Oh, didn=E2=80=99t know that one.

>> Was it removed or are we just missing a kconfig option?
>
> Strange:
>
>  ~ =CE=BB grep CPU_FREQ_GOV =E2=80=A6/aux-files/linux-libre/5.3-x86_64.co=
nf
> CONFIG_CPU_FREQ_GOV_ATTR_SET=3Dy
>  CONFIG_CPU_FREQ_GOV_COMMON=3Dy
>  CONFIG_CPU_FREQ_GOV_PERFORMANCE=3Dy
>  CONFIG_CPU_FREQ_GOV_POWERSAVE=3Dy
>  CONFIG_CPU_FREQ_GOV_USERSPACE=3Dy
>  CONFIG_CPU_FREQ_GOV_ONDEMAND=3Dy
>  CONFIG_CPU_FREQ_GOV_CONSERVATIVE=3Dy
>  CONFIG_CPU_FREQ_GOV_SCHEDUTIL=3Dy

Weird, I see:

--8<---------------cut here---------------start------------->8---
$ cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors
performance powersave
performance powersave
performance powersave
performance powersave
$ uname -a
Linux ribbon 5.3.7-gnu #1 SMP 1 x86_64 GNU/Linux
--8<---------------cut here---------------end--------------->8---

Do you see more governors on your side?  How could that be?

> What does cpufreq-info say?

On my laptop (plugged in) I have this:

--8<---------------cut here---------------start------------->8---
$ guix environment --ad-hoc cpufrequtils -- cpufreq-info
cpufrequtils 0.3: cpufreq-info (C) Dominik Brodowski 2004
Report errors and bugs to linux@HIDDEN, please.
analyzing CPU 0:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.37 GHz.
analyzing CPU 1:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.25 GHz.
analyzing CPU 2:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 2
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.28 GHz.
analyzing CPU 3:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 3
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.31 GHz.
--8<---------------cut here---------------end--------------->8---

Thanks,
Ludo=E2=80=99.




Information forwarded to bug-guix@HIDDEN:
bug#37904; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@HIDDEN>
Subject: Re: bug#37904: CPU overheating on recent laptops
References: <87a79qfayh.fsf@HIDDEN> <87v9sef6n0.fsf@nckx>
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Hi,

Tobias Geerinckx-Rice via Bug reports for GNU Guix <bug-guix@HIDDEN>
skribis:

> Ludovic Court=C3=A8s =E5=86=99=E9=81=93=EF=BC=9A
>> Also, there used to be an =E2=80=9Condemand=E2=80=9D governor, which is =
no longer
>> listed
>> in /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors.
>
> For laptops and other battery-powered devices, =E2=80=98conservative=E2=
=80=99 is
> preferred over =E2=80=98ondemand=E2=80=99.  It's probably a sane default =
choice for
> all.

Oh, didn=E2=80=99t know that one.

>> Was it removed or are we just missing a kconfig option?
>
> Strange:
>
>  ~ =CE=BB grep CPU_FREQ_GOV =E2=80=A6/aux-files/linux-libre/5.3-x86_64.co=
nf
> CONFIG_CPU_FREQ_GOV_ATTR_SET=3Dy
>  CONFIG_CPU_FREQ_GOV_COMMON=3Dy
>  CONFIG_CPU_FREQ_GOV_PERFORMANCE=3Dy
>  CONFIG_CPU_FREQ_GOV_POWERSAVE=3Dy
>  CONFIG_CPU_FREQ_GOV_USERSPACE=3Dy
>  CONFIG_CPU_FREQ_GOV_ONDEMAND=3Dy
>  CONFIG_CPU_FREQ_GOV_CONSERVATIVE=3Dy
>  CONFIG_CPU_FREQ_GOV_SCHEDUTIL=3Dy

Weird, I see:

--8<---------------cut here---------------start------------->8---
$ cat /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors
performance powersave
performance powersave
performance powersave
performance powersave
$ uname -a
Linux ribbon 5.3.7-gnu #1 SMP 1 x86_64 GNU/Linux
--8<---------------cut here---------------end--------------->8---

Do you see more governors on your side?  How could that be?

> What does cpufreq-info say?

On my laptop (plugged in) I have this:

--8<---------------cut here---------------start------------->8---
$ guix environment --ad-hoc cpufrequtils -- cpufreq-info
cpufrequtils 0.3: cpufreq-info (C) Dominik Brodowski 2004
Report errors and bugs to linux@HIDDEN, please.
analyzing CPU 0:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 0
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.37 GHz.
analyzing CPU 1:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 1
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.25 GHz.
analyzing CPU 2:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 2
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.28 GHz.
analyzing CPU 3:
  driver: intel_pstate
  CPUs which need to switch frequency at the same time: 3
  hardware limits: 400 MHz - 3.40 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 400 MHz and 3.40 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency is 3.31 GHz.
--8<---------------cut here---------------end--------------->8---

Thanks,
Ludo=E2=80=99.




Information forwarded to bug-guix@HIDDEN:
bug#37904; Package guix. Full text available.

Message received at 37904 <at> debbugs.gnu.org:


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From: Tobias Geerinckx-Rice <me@HIDDEN>
To: 37904 <at> debbugs.gnu.org
Subject: Re: bug#37904: CPU overheating on recent laptops
References: <87a79qfayh.fsf@HIDDEN>
In-reply-to: <87a79qfayh.fsf@HIDDEN>
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--=-=-=
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: quoted-printable

Ludo',

Ludovic Court=C3=A8s =E5=86=99=E9=81=93=EF=BC=9A
> Also, there used to be an =E2=80=9Condemand=E2=80=9D governor, which is n=
o=20
> longer listed
> in=20
> /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors.

For laptops and other battery-powered devices, =E2=80=98conservative=E2=80=
=99 is=20
preferred over =E2=80=98ondemand=E2=80=99.  It's probably a sane default ch=
oice=20
for all.

> Was it removed or are we just missing a kconfig option?

Strange:

  ~ =CE=BB grep CPU_FREQ_GOV =E2=80=A6/aux-files/linux-libre/5.3-x86_64.con=
f=20
  CONFIG_CPU_FREQ_GOV_ATTR_SET=3Dy
  CONFIG_CPU_FREQ_GOV_COMMON=3Dy
  CONFIG_CPU_FREQ_GOV_PERFORMANCE=3Dy
  CONFIG_CPU_FREQ_GOV_POWERSAVE=3Dy
  CONFIG_CPU_FREQ_GOV_USERSPACE=3Dy
  CONFIG_CPU_FREQ_GOV_ONDEMAND=3Dy
  CONFIG_CPU_FREQ_GOV_CONSERVATIVE=3Dy
  CONFIG_CPU_FREQ_GOV_SCHEDUTIL=3Dy

What does cpufreq-info say?

Kind regards,

T G-R

--=-=-=
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--=-=-=--




Information forwarded to bug-guix@HIDDEN:
bug#37904; Package guix. Full text available.

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludovic.courtes@HIDDEN>
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Subject: CPU overheating on recent laptops
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Hello,

I=E2=80=99ve had reports that Guix System on recent Dell laptops tends to l=
ead
to overheating (with GNOME and all).

According to /sys/devices/system/cpu/cpu?/cpufreq/scaling_governor, all
the CPUs are running on the =E2=80=98performance=E2=80=99 governor by defau=
lt, with
frequencies around 4=C2=A0GHz (CPUs on these machines range from 400=C2=A0M=
Hz to
4.7=C2=A0GHz).  So with just a load of 0.3 or so, the CPUs would be at ~65=
=C2=B0C
(as reported by =E2=80=98sensors=E2=80=99) and the fans would start making =
noise.

If we explicitly change to the =E2=80=98powersave=E2=80=99 governor by writ=
ing to /sys,
frequencies go down and the machine behaves better.

However, I would expect UPower to do the right thing in the first
place.  Do you know what the story is here?  Are we missing some config
bits?

Also, there used to be an =E2=80=9Condemand=E2=80=9D governor, which is no =
longer listed
in /sys/devices/system/cpu/cpu?/cpufreq/scaling_available_governors.
Was it removed or are we just missing a kconfig option?

Thanks,
Ludo=E2=80=99.




Acknowledgement sent to Ludovic Courtès <ludovic.courtes@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#37904; Package guix. Full text available.
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