| View previous topic :: View next topic |
| Author |
Message |
MorgothSauron
Tux's lil' helper
Joined: 24 Sep 2020
Posts: 81
|
 Posted: Thu Jun 27, 2024 4:54 pm Post subject: [solved] cpupower unable to set performance governor at boot |
 |
|
Hello,
I'm trying to use sys-power/cpupower to change the CPU scaling governor from 'powersave' to 'performance' at boot, but I always end up with 'powersave'. At least this is my conclusion based on everything I verified.
I have cpupower 6.2.0 installed
| Code: | root@morgoth:~ # eix sys-power/cpupower
[I] sys-power/cpupower
Available versions: 5.18(0/0) 6.2(0/0) {nls}
Installed versions: 6.2(0/0)(06:36:24 PM 06/05/2024)(nls)
Homepage: https://www.kernel.org/
Description: Shows and sets processor power related values
root@morgoth:~ # cpupower --version
cpupower 6.2.0
Report errors and bugs to linux-pm@vger.kernel.org, please.
root@morgoth:~ # |
I changed the START_OPTS value in /etc/conf.d/cpupower to set governor to 'performance' instead of the default (ondemand). This is the only change I made to this file.
| Code: | root@morgoth:~ # grep START_OPTS /etc/conf.d/cpupower
##START_OPTS="--governor ondemand"
START_OPTS="--governor performance"
root@morgoth:~ #
|
Finally, I added the cpupower service to start at boot
| Code: | | rc-update add cpupower default |
I can see in /var/log/rc.log that the cpupower command is executed at boot with the option I set in the configuration:
| Code: |
* Running cpupower -c all frequency-set --governor performance ...
[ ok ] |
However, the governor is set to 'powersave':
| Code: | # cpupower frequency-info
analyzing CPU 7:
driver: intel_pstate
CPUs which run at the same hardware frequency: 7
CPUs which need to have their frequency coordinated by software: 7
maximum transition latency: Cannot determine or is not supported.
hardware limits: 800 MHz - 4.90 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 800 MHz and 4.90 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 4.69 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes |
Running the command manually using the command from rc.log seems to work:
| Code: | root@morgoth:~ # cpupower -c all frequency-set --governor performance
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
Setting cpu: 4
Setting cpu: 5
Setting cpu: 6
Setting cpu: 7
root@morgoth:~ # cpupower frequency-info
analyzing CPU 2:
driver: intel_pstate
CPUs which run at the same hardware frequency: 2
CPUs which need to have their frequency coordinated by software: 2
maximum transition latency: Cannot determine or is not supported.
hardware limits: 800 MHz - 4.90 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 800 MHz and 4.90 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 4.79 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes
root@morgoth:~ # |
The performance governor is normally the one set as the default in the kernel configuration:
| Code: | -*- CPU Frequency scaling
[*] CPU frequency transition statistics
Default CPUFreq governor (performance) --->
-*- 'performance' governor
<M> 'powersave' governor
<*> 'userspace' governor for userspace frequency scaling
< > 'ondemand' cpufreq policy governor
< > 'conservative' cpufreq governor
root@morgoth:~ # zcat /proc/config.gz | grep CPU_FREQ_GOV_PERFORMANCE
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
root@morgoth:~ #
|
I could not find anything else that could explain this behavior
Any idea why 'powersave' seems to be the "active" governor at boot although the cpupower service is executed with the right parameter to set it to 'performance' ?
Am I missing something important here ?
Thanks
Last edited by MorgothSauron on Mon Jan 06, 2025 5:56 pm; edited 1 time in total |
|
| Back to top |
|
 |
Pearlseattle
Apprentice
Joined: 04 Oct 2007
Posts: 165
Location: Switzerland
|
| Posted: Fri Jun 28, 2024 5:16 pm Post subject: |
|
|
That's weird! 
(but I never used "cpupower" so I don't know anything specific about it)
Extreme wild guess:
maybe it happens because you compile "powersave" as module but "performance" as embedded in the kernel?
Therefore maaaybe "performance" is set right when the kernel is loaded, but then when your modules-directory is mounted the kernel sees a compatible governor that is available ("powersave") and therefore loads it? And/or then maybe there is a race condition with the start of "cpupower" vs. load of available modules and what I wrote in my previous sentence happens after "cpupower" is started?
Therefore, here is my proposal #1:
compile "powersave" as well embedded (not as a module) and see if that changes anything?
Otherwise, just to be 200% sure: whenever you check then check all vCPUs, just to be sure that they're all the same:
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
Maybe you could try to write your own (as "root") "/etc/init.d/mycustom-cpu_governor" like for example...
| Code: | #!/sbin/openrc-run
start() {
echo "performance" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null
}
stop() {
echo nothing2do
} |
...then "chmod 700 /etc/init.d/mycustom-cpu_governor", then test it with "/etc/init.d/mycustom-cpu_governor start" and if that works then add it to the boot sequence with "rc-update add mycustom-cpu_governor default" and then reboot and then finally check the result with "cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor"?
If this would not work (you would still see "powersave" being used, but when executing "/etc/init.d/mycustom-cpu_governor start" then it works, then I'd guess that you most probably have "something else" that is executed later in the boot sequence that makes you use "powersave"...?
Cheers |
|
| Back to top |
|
|
pietinger
Moderator
Joined: 17 Oct 2006
Posts: 5293
Location: Bavaria
|
| Posted: Fri Jun 28, 2024 5:55 pm Post subject: Re: cpupower - unable to set performance governor at boot |
|
|
| MorgothSauron wrote: | The performance governor is normally the one set as the default in the kernel configuration:
| Code: | -*- CPU Frequency scaling
[*] CPU frequency transition statistics
Default CPUFreq governor (performance) --->
-*- 'performance' governor
<M> 'powersave' governor
<*> 'userspace' governor for userspace frequency scaling
< > 'ondemand' cpufreq policy governor
< > 'conservative' cpufreq governor
root@morgoth:~ # zcat /proc/config.gz | grep CPU_FREQ_GOV_PERFORMANCE
CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
root@morgoth:~ #
|
|
This means you are configuring your kernel yourself - this is an advantage. NOW ...
... usually you dont need cpupower at all, because the DEFAULT kernel setting decides which governor is used - this one:
| Code: | ...
Default CPUFreq governor (performance) --->
... |
and this will not be changed ... IF ... if there is no rc-script which is doing this ... so, I suggest to remove cpupower completely from your runlevel AND then check if the governor is changed after a fresh reboot. IF YES, THEN some other rc-script OR some application in your DE or WM is doing it !
I configure my kernel also myself and have set the default to "schedutil" - "performance" is enabled automatially because of "Selected by [y]: - X86_INTEL_PSTATE [=y] && CPU_FREQ [=y] && X86 [=y]" - all others are disabled.
| Code: | Default CPUFreq governor (schedutil) --->
-*- 'performance' governor
-*- 'schedutil' cpufreq policy governor |
_________________
https://wiki.gentoo.org/wiki/User:Pietinger |
|
| Back to top |
|
|
Goverp
Advocate
Joined: 07 Mar 2007
Posts: 2194
|
| Posted: Fri Jun 28, 2024 6:51 pm Post subject: |
|
|
I probably missed it above, but I don't see what sort of PC you have. So, making a wild guess, it's a laptop or equivalent (otherwise you might not be too concerned about power managers). In which case there might be some packages such as laptop-mode-tools that will play with cpu power settings. I think if you install KDE powerdevil, that too will alter settings without telling you. Such packages do this as a matter of course, as it's their primary function.
_________________
Greybeard |
|
| Back to top |
|
|
pietinger
Moderator
Joined: 17 Oct 2006
Posts: 5293
Location: Bavaria
|
| Posted: Sat Jun 29, 2024 12:56 am Post subject: |
|
|
The whole thing gave me no peace and I tested it myself today (as I don't normally use the rc-script "cpupower"). Result: The rc-script is not able to change the governor (*) and is therefore faulty for me. Manually I can change from "powersave" to "performance" (and back) with "cpupower" (Intel's P-State only recognizes this two).
*) I didnt changed the file /etc/conf.d/cpupower (default is there: START_OPTS="--governor powersave") and started my machine with my default from kernel "performance" ... It was still performance after starting this rc-script.
I then also looked at how the power preference changes:
| Code: | /sys/devices/system/cpu/cpu0/cpufreq # cpupower -c all frequency-set --governor powersave
CPU einstellen: 0
...
CPU einstellen: 31
/sys/devices/system/cpu/cpu0/cpufreq # cat scaling_governor
powersave
/sys/devices/system/cpu/cpu0/cpufreq # cat energy_performance_preference
balance_performance
/sys/devices/system/cpu/cpu0/cpufreq # cpupower -c all frequency-set --governor performance
...
/sys/devices/system/cpu/cpu0/cpufreq # cat scaling_governor
performance
/sys/devices/system/cpu/cpu0/cpufreq # cat energy_performance_preference
performance |
I have also checked with which setting P-State starts if you set "performance" as default in the kernel configuration: Yes, it is/was "performance".
_________________
https://wiki.gentoo.org/wiki/User:Pietinger |
|
| Back to top |
|
|
MorgothSauron
Tux's lil' helper
Joined: 24 Sep 2020
Posts: 81
|
| Posted: Tue Jul 02, 2024 6:10 pm Post subject: |
|
|
| Goverp wrote: | | I probably missed it above, but I don't see what sort of PC you have. So, making a wild guess, it's a laptop or equivalent (otherwise you might not be too concerned about power managers). In which case there might be some packages such as laptop-mode-tools that will play with cpu power settings. I think if you install KDE powerdevil, that too will alter settings without telling you. Such packages do this as a matter of course, as it's their primary function. |
I have a desktop computer with an i7-9700k CPU with a Gigabyte Z390 AORUS PRO motherboard.
I do have kde-plasma/powerdevil installed. The Power management profile option is not enabled, so there might be some default settings involved here. I will try to boot without logging in and check the governor value. It should confirm what is the value before opening a session. I will do this quick test and post back.
On a side note, I didn't have cpupower until few weeks ago. I had powersave before installing and enabling cpupower. I was looking for option to set to performance by default. |
|
| Back to top |
|
|
MorgothSauron
Tux's lil' helper
Joined: 24 Sep 2020
Posts: 81
|
| Posted: Wed Jul 03, 2024 5:36 pm Post subject: |
|
|
I'm not sure I understand what is really going on.
I booted and I didn't login in KDE (my only DE) and switched to a console instead (e.g. Ctrl+Alt+f5). The CPU scaling governor is still set to 'powersave'. I think it is safe to say that it is not related to something with KDE startup (e.g. powerdevil). cpupower service was still configured to start at boot.
In the same console I checked the value directly in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor to be sure. It is 'powersave'.
I removed cpupower from OpenRC startup (rc-update del cpupower default) and rebooted. Still the same.
I checked for all files under /etc. I could not find anything that would set the scaling governor to 'powersave'.
The local service is enabled, but I have nothing in /etc/local.d either.
But I decided to try to put my own script for the local service:
| Code: | root@morgoth:~ # cat /etc/local.d/cpufreq-scaling-governor-performance.start
#
echo "performance" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null
#
root@morgoth:~ # |
I rebooted and this time cpupower frequency-info is showing 'performance'.
I have no clue why my script started by the 'local' service can do something that the 'cpupower' service doesn't seem to do. Also, I still don't understand that I end up with 'powersave' when 'performance' is set as the default in the kernel options. I must be missing something, but I don't know it yet.
I'll try to play around with this to see if I can really understand. For now the script started by the 'local' service will do the job. |
|
| Back to top |
|
|
pietinger
Moderator
Joined: 17 Oct 2006
Posts: 5293
Location: Bavaria
|
| Posted: Wed Jul 03, 2024 5:43 pm Post subject: |
|
|
MorgothSauron,
IF you have "performance" as default in your kernel configured ... THEN ... check if you really boot the kernel you think you boot ->
Check with "dmesg | grep version" the version AND date of the kernel (it is the first line you will get). The date at the end is the date when this kernel was built (compiled). Usually you will install the kernel some seconds later into /boot ... NOW check also with "ls -l /boot" the timestamps of every kernel you have here ...
Maybe you use grub ? If yes ... the first kernel grub presents (and boots) is not always the last kernel you have compiled ... 
_________________
https://wiki.gentoo.org/wiki/User:Pietinger |
|
| Back to top |
|
|
MorgothSauron
Tux's lil' helper
Joined: 24 Sep 2020
Posts: 81
|
| Posted: Wed Jul 03, 2024 6:23 pm Post subject: |
|
|
pietinger,
Here are the details about the kernels on my system. It looks good to me.
/boot:
| Code: | root@morgoth:~ # date
Wed Jul 3 08:09:52 PM CEST 2024
root@morgoth:~ # ls -al /boot
total 109620
drwxr-xr-x 4 root root 4096 Jun 27 19:24 .
drwxr-xr-x 1 root root 134 Apr 27 12:49 ..
-rw-r--r-- 1 root root 77312 Jun 17 19:10 amd-uc.img
drwxr-xr-x 6 root root 4096 Jun 27 19:24 grub
-rw-r--r-- 1 root root 9054432 Jun 12 19:27 initramfs-6.9.4-gentoo-x86_64.img
-rw-r--r-- 1 root root 9059680 Jun 17 19:24 initramfs-6.9.5-gentoo-x86_64.img
-rw-r--r-- 1 root root 9057256 Jun 25 19:39 initramfs-6.9.6-gentoo-x86_64.img
-rw-r--r-- 1 root root 9060356 Jun 27 19:23 initramfs-6.9.7-gentoo-x86_64.img
-rw-r--r-- 1 root root 534528 Jun 27 18:06 intel-uc.img
-rw-r--r-- 1 root root 0 Nov 18 2020 .keep
drwx------ 2 root root 16384 Nov 21 2020 lost+found
-rw-r--r-- 1 root root 6732898 Jun 12 19:14 System.map-6.9.4-gentoo-x86_64
-rw-r--r-- 1 root root 6733110 Jun 17 19:15 System.map-6.9.5-gentoo-x86_64
-rw-r--r-- 1 root root 6733546 Jun 25 19:29 System.map-6.9.6-gentoo-x86_64
-rw-r--r-- 1 root root 6734861 Jun 27 19:14 System.map-6.9.7-gentoo-x86_64
-rw-r--r-- 1 root root 12100608 Jun 12 19:14 vmlinuz-6.9.4-gentoo-x86_64
-rw-r--r-- 1 root root 12100608 Jun 17 19:15 vmlinuz-6.9.5-gentoo-x86_64
-rw-r--r-- 1 root root 12108800 Jun 25 19:29 vmlinuz-6.9.6-gentoo-x86_64
-rw-r--r-- 1 root root 12108800 Jun 27 19:14 vmlinuz-6.9.7-gentoo-x86_64
root@morgoth:~ # |
I use initramfs because / is on a filesystem encrypted with LUKS. I use genkernel.
Running kernel is 6.9.7. The kernel file date match the build date.
| Code: | root@morgoth:/ # dmesg | grep "Linux version"
[ 0.000000] Linux version 6.9.7-gentoo-x86_64 (root@morgoth) (x86_64-pc-linux-gnu-gcc (Gentoo 13.2.1_p20240210 p14) 13.2.1 20240210, GNU ld (Gentoo 2.42 p3) 2.42.0) #1 SMP PREEMPT_DYNAMIC Thu Jun 27 19:14:31 CEST 2024
root@morgoth:/ #
root@morgoth:/ # uname -a
Linux morgoth 6.9.7-gentoo-x86_64 #1 SMP PREEMPT_DYNAMIC Thu Jun 27 19:14:31 CEST 2024 x86_64 Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz GenuineIntel GNU/Linux
root@morgoth:/ # |
'perfomance' is set as the default in the running kernel configuration
| Code: | root@morgoth:~ # zcat /proc/config.gz | grep CPU_FREQ_DEFAULT_GOV_PERFORMANCE
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
root@morgoth:~ # |
I do use grub. I make sure to run grub-mkconfig -o /boot/grub/grub.cfg every time I make a change in /boot, like removing an old kernel.
The first menuentry in /boot/grub/grub.cfg is 6.9.7 as well.
| Code: | ### BEGIN /etc/grub.d/10_linux ###
menuentry 'Gentoo GNU/Linux' --class gentoo --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-b7d7d156-3372-40ba-b71c-54542050af8b' {
load_video
if [ "x$grub_platform" = xefi ]; then
set gfxpayload=keep
fi
insmod gzio
insmod part_gpt
insmod ext2
search --no-floppy --fs-uuid --set=root ac315056-593b-4566-94be-209a3f784d10
echo 'Loading Linux 6.9.7-gentoo-x86_64 ...'
linux /vmlinuz-6.9.7-gentoo-x86_64 root=UUID=b7d7d156-3372-40ba-b71c-54542050af8b ro rootflags=subvol=@root init=/sbin/openrc-init keymap=us crypt_root=UUID=ec03044a-df21-4347-a166-49d65a17bf93 root=UUID=b7d7d156-3372-40ba-b71c-545420
50af8b rootflags=subvol=@root delayacct
echo 'Loading initial ramdisk ...'
initrd /intel-uc.img /amd-uc.img /initramfs-6.9.7-gentoo-x86_64.img
} |
|
|
| Back to top |
|
|
pietinger
Moderator
Joined: 17 Oct 2006
Posts: 5293
Location: Bavaria
|
| Posted: Wed Jul 03, 2024 8:40 pm Post subject: |
|
|
MorgothSauron,
yes you are booting with a kernel which setting is "performance" as default ... I am sorry, I must give up  ->
I have also a manually configured kernel (also 6.9.7 as you have; but NO initramfs) and had "performance" as default in my kernel configured (for testing) ... even with a KDE/Plasma system I had still "performce" after rebooting active ...
These are my rc-scripts:
| Code: | $ rc-update
alsasound | boot
apparmor | boot
binfmt | boot
bootmisc | boot
cgroups | sysinit
chronyd | default
cronie | default
devfs | sysinit
display-manager | default
dmesg | sysinit
elogind | boot
fsck | boot
hostname | boot
iptables | default
keymaps | boot
killprocs | shutdown
kmod-static-nodes | sysinit
local | default nonetwork
localmount | boot
loopback | boot
modules | boot
mount-ro | shutdown
mtab | boot
net.enp2s0 | default
osclock | default
privoxy | default
procfs | boot
root | boot
save-keymaps | boot
save-termencoding | boot
savecache | shutdown
seedrng | boot
swap | boot
sysctl | boot
sysfs | sysinit
sysklogd | default
systemd-tmpfiles-setup | boot
systemd-tmpfiles-setup-dev | sysinit
termencoding | boot
udev | sysinit
udev-trigger | sysinit
unbound | default |
(maybe it helps to check if there is a suspicious script you use)
Maybe extract your initramfs and check what it does ?
( https://wiki.gentoo.org/wiki/Custom_Initramfs#Extracting_the_cpio_archive )
_________________
https://wiki.gentoo.org/wiki/User:Pietinger |
|
| Back to top |
|
|
MorgothSauron
Tux's lil' helper
Joined: 24 Sep 2020
Posts: 81
|
| Posted: Mon Jan 06, 2025 5:55 pm Post subject: |
|
|
I checked the content of the initramfs and I couldn´t find anything related to CPU scaling.
I got the expected result using a script in /etc/local.d
| Code: | #
echo "$0"
# this works
# echo "performance" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null 2>&1
# test if cpupower works in 'local' because the standalone 'cpupower' service doesn't seem to work
cpupower -c all frequency-set --governor performance
# |
What is interesting is that both methods (echo and cpupower command) work. And the cpupower command is exactly the same as the cpupower service. This seems to indicate something related to service start order. I suspect it could be power-profiles-daemon, but I didn´t investigate this.
| Code: | root@morgoth:~ # rc-status
Runlevel: default
sysklogd [ started ]
ntpd [ started ]
cronie [ started ]
libvirtd [ started ]
netmount [ started ]
display-manager [ started ]
freshclam [ started ]
clamd [ started ]
pcscd [ started ]
power-profiles-daemon [ started ]
sshd [ started ]
local [ started ]
agetty.tty6 [ started 01:04:33 (0) ]
agetty.tty5 [ started 01:04:33 (0) ]
agetty.tty4 [ started 01:04:33 (0) ]
agetty.tty3 [ started 01:04:33 (0) ]
agetty.tty2 [ started 01:04:33 (0) ]
agetty.tty1 [ started 01:04:33 (0) ]
Dynamic Runlevel: hotplugged
net.enp5s0 [ started ]
Dynamic Runlevel: needed/wanted
display-manager-setup [ started ]
dbus [ started ]
virtlogd [ started ]
Dynamic Runlevel: manual |
I don´t have much time right now to investigate any further. I'll update this topic if I ever find what
Marking this topic as solved. |
|
| Back to top |
|
|
papu
l33t
Joined: 25 Jan 2008
Posts: 737
Location: Sota algun pi o alzina...
|
| Posted: Thu Jan 09, 2025 11:32 pm Post subject: |
|
|
Hello,
I am experiencing a similar case. The cpupower works for me, and it changes from powersave to performance, but what doesn't work for me or what I don't have support for is schedutil, even though I have it set as default in the kernel.
| Quote: | Linux/x86 6.12.9-gentoo Kernel Configuration
-*- CPU Frequency scaling │
│ [ ] CPU frequency transition statistics │
│ Default CPUFreq governor (schedutil) ---> │
│ -*- 'performance' governor │
│ < > 'powersave' governor │
│ <*> 'userspace' governor for userspace frequency scaling │
│ < > 'ondemand' cpufreq policy governor │
│ < > 'conservative' cpufreq governor │
│ -*- 'schedutil' cpufreq policy governor │
│ *** CPU frequency scaling drivers *** │
│ [ ] Intel P state control │
│ <M> Processor Clocking Control interface driver │
│ -*- AMD Processor P-State driver │
│ (3) AMD Processor P-State default mode │
│ <M> selftest for AMD Processor P-State driver │
│ <M> ACPI Processor P-States driver |
I also don't understand is why I only have support for performance or powersave, and why powersave is the default in the system if I don't even have it enabled in the kernel. I am a plasma 6 user
| Quote: | ~ $ cpupower frequency-info
analyzing CPU 9:
driver: amd-pstate-epp
CPUs which run at the same hardware frequency: 9
CPUs which need to have their frequency coordinated by software: 9
maximum transition latency: Cannot determine or is not supported.
hardware limits: 545 MHz - 5.39 GHz
available cpufreq governors: performance powersave
current policy: frequency should be within 545 MHz and 5.39 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 4.26 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: yes
AMD PSTATE Highest Performance: 166. Maximum Frequency: 5.39 GHz.
AMD PSTATE Nominal Performance: 117. Nominal Frequency: 3.80 GHz.
AMD PSTATE Lowest Non-linear Performance: 93. Lowest Non-linear Frequency: 3.02 GHz.
AMD PSTATE Lowest Performance: 13. Lowest Frequency: 545 MHz |
_________________
~amd64 & openrc --cpu 7700 --ram 2x16GB --gpu RX 6600
Last edited by papu on Fri Jan 10, 2025 2:24 pm; edited 2 times in total |
|
| Back to top |
|
|
Ralphred
l33t
Joined: 31 Dec 2013
Posts: 689
|
| Posted: Fri Jan 10, 2025 1:23 am Post subject: |
|
|
| papu wrote: | I also don't understand is why I only have support for performance or powersave, and why powersave is the default in the system if I don't even have it enabled in the kernel. I am a plasma 6 user
| Quote: | ~ $ cpupower frequency-info
analyzing CPU 9:
driver: amd-pstate-epp |
|
AMD's pstate driver only supports powersave and performance. There are some nifty switches you can use on the kernel cmdline that will tailor the governors, personally I find just | Code: | | amd_pstate=active amd_prefcore=enable |
with the powersave governor gives the best result (whilst "active" might sound like a boolean switch, it isn't) << It's the only non "run it at full speed always" governor I've ever found that will run games smoothly, and the the extra thermal overhead from running powersave actually lets the CPU perform better when some cores are idle.
The amd pstate driver was only "fully implemented" in kernel 6.9.1, so check the change logs for it being backported or upgrade to >=6.9.1. |
|
| Back to top |
|
|
papu
l33t
Joined: 25 Jan 2008
Posts: 737
Location: Sota algun pi o alzina...
|
| Posted: Fri Jan 10, 2025 2:44 pm Post subject: |
|
|
| Ralphred wrote: | | papu wrote: | I also don't understand is why I only have support for performance or powersave, and why powersave is the default in the system if I don't even have it enabled in the kernel. I am a plasma 6 user
| Quote: | ~ $ cpupower frequency-info
analyzing CPU 9:
driver: amd-pstate-epp |
|
AMD's pstate driver only supports powersave and performance. There are some nifty switches you can use on the kernel cmdline that will tailor the governors, personally I find just | Code: | | amd_pstate=active amd_prefcore=enable |
with the powersave governor gives the best result (whilst "active" might sound like a boolean switch, it isn't) << It's the only non "run it at full speed always" governor I've ever found that will run games smoothly, and the the extra thermal overhead from running powersave actually lets the CPU perform better when some cores are idle.
The amd pstate driver was only "fully implemented" in kernel 6.9.1, so check the change logs for it being backported or upgrade to >=6.9.1. |
I forgot to mention my kernel : 6.12.9
I don't understand why is using powersave if itsn't enabled in my kernel, are the cpu drivers independent of kernel CPU Frequency scaling options?
There may still be not no CPU that supports schedutil, may there?
_________________
~amd64 & openrc --cpu 7700 --ram 2x16GB --gpu RX 6600 |
|
| Back to top |
|
|
Goverp
Advocate
Joined: 07 Mar 2007
Posts: 2194
|
| Posted: Fri Jan 10, 2025 4:01 pm Post subject: |
|
|
papu,
FWIW my setup is using AMD p-state=guided with schedutil as governor. That's on an AMD Ryzen 9 5950X, kernel 6.12.9.
My guess is you aren't running the kernel you think you are...
_________________
Greybeard |
|
| Back to top |
|
|
Ralphred
l33t
Joined: 31 Dec 2013
Posts: 689
|
| Posted: Fri Jan 10, 2025 4:34 pm Post subject: |
|
|
| papu wrote: | | I forgot to mention my kernel : 6.12.9 |
You're all good then, I've only tested 6.9.1 and 6.12.8 < both seem fine
| Quote: | | don't understand why is using powersave if itsn't enabled in my kernel, are the cpu drivers independent of kernel CPU Frequency scaling options? |
Kind of, from the info in your first post you are running amd-pstate-epp (the best one IME). I think you can use the other drivers if you chose a different operating mode ('guided' IIRC, I only used it once and it wasn't as good as 'active' mode, that was on a zen3 5600X so YMMV)
Don't conflate the epp governors with the "traditional" powersave and performance governors though (where powersave would cap max_freq to under that which the hardware was capable of, and performance would peg all cores at max), they are both more of an "ondemand" governor, one with a preference towards energy efficiency, and one with a preference towards performance.
As I'm writing this now my cpu usage is at about 5%: Using the powersave governor I have cores running between 0.6 and 5.6GHz, with an average of ~2.8GHz, if switch it to performance I get cores running between 0.6 and 5.5, with an average of ~3.2GHz. If I load it up to 100% both governors produce the same result with cores running between 4.8-4.9 with an average of 4.9GHz. The cpu is sold as a 4.4GHz processor, so I'd expect the 100% load numbers to possibly drop as it gets warmer.[/quote] |
|
| Back to top |
|
|
|
Kernel & Hardware
