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This is my machine
$ uname -a
Linux titanlinux 5.6.15-arch1-1 #1 SMP PREEMPT Wed, 27 May 2020 23:42:26 +0000 x86_64 GNU/Linux
$ less /proc/cpuinfo | grep model\ name
model name : Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz
As you can see, I have a Coffe Lake family CPU, in which Speed Shift aka HWP technology has been implemented, and I am able to turn it on under Windows 10, i.e. with Quick CPU.
I did some reading, and I found, that HWP has been implemented in Linux kernel since version 4.12. by intel_pstate module, which should be loaded automatically.
(...)If the processor supports the HWP feature, it will be enabled during the processor initialization and cannot be disabled after that. (...)
Howevere when it was first released, it was said:
(...)Note, however, that some of those processors may not be supported.(...)
My question is if my contemporary kernel support HWP on my CPU? Seems to me not out-of-the-box, as this shows
$ lsmod | grep intel
intel_rapl_msr 20480 0
intel_rapl_common 32768 1 intel_rapl_msr
intel_wmi_thunderbolt 20480 0
intel_powerclamp 20480 0
snd_sof_intel_byt 20480 1 snd_sof_pci
snd_sof_intel_ipc 20480 1 snd_sof_intel_byt
snd_sof_intel_hda_common 81920 1 snd_sof_pci
kvm_intel 331776 0
snd_soc_hdac_hda 24576 1 snd_sof_intel_hda_common
snd_sof_xtensa_dsp 16384 2 snd_sof_intel_hda_common,snd_sof_intel_byt
snd_sof_intel_hda 20480 1 snd_sof_intel_hda_common
snd_sof 126976 4 snd_sof_pci,snd_sof_intel_hda_common,snd_sof_intel_byt,snd_sof_intel_ipc
kvm 827392 1 kvm_intel
snd_hda_ext_core 36864 4 snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_soc_skl,snd_sof_intel_hda
snd_soc_acpi_intel_match 40960 3 snd_sof_pci,snd_sof_intel_hda_common,snd_soc_skl
snd_soc_acpi 16384 4 snd_soc_acpi_intel_match,snd_sof_intel_hda_common,snd_sof_intel_byt,snd_soc_skl
snd_soc_core 299008 4 snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_soc_skl
snd_hda_intel 57344 3
btintel 32768 1 btusb
snd_intel_dspcfg 28672 4 snd_hda_intel,snd_sof_pci,snd_sof_intel_hda_common,snd_soc_skl
ghash_clmulni_intel 16384 0
bluetooth 696320 43 btrtl,btintel,btbcm,bnep,btusb,rfcomm
snd_hda_codec 167936 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek,snd_soc_hdac_hda
aesni_intel 368640 16
snd_hda_core 106496 10 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_sof_intel_hda_common,snd_soc_hdac_hda,snd_soc_skl,snd_sof_intel_hda
crypto_simd 16384 1 aesni_intel
cryptd 24576 5 crypto_simd,ghash_clmulni_intel
glue_helper 16384 1 aesni_intel
intel_cstate 16384 0
intel_spi_pci 16384 0
intel_uncore 147456 0
intel_spi 24576 1 intel_spi_pci
snd_pcm 147456 9 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_sof,snd_sof_intel_hda_common,snd_soc_core,snd_soc_skl,snd_hda_core,snd_pcm_dmaengine
intel_rapl_perf 16384 0
spi_nor 65536 1 intel_spi
mtd 77824 6 spi_nor,cmdlinepart,intel_spi,ofpart
snd 114688 20 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_compress,snd_soc_core,snd_pcm
intel_pch_thermal 16384 0
wmi 36864 4 intel_wmi_thunderbolt,wmi_bmof,msi_wmi,mxm_wmi
As you see above, intel_cstate not intel_pstate module is loaded.
"... being a Linux user is sort of like living in a house inhabited by a large family of carpenters and architects. Every morning when you wake up, the house is a little different. Maybe there is a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed."
MSI Raider GE78HX 13VI-032PL
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intel_pstate is not a module, it's internal to the kernel and will activate on supported HW.
sudo journalctl -b | grep pstate
is a better immediate check or check the sysfs paths.
All of this is in the documentation you yourself linked, read it a bit more closely to check what is actually true for your hardware.
Last edited by V1del (2020-06-01 10:17:37)
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Thank you for clearing that out - seems like HWP is on...
$ sudo journalctl -b | grep pstate
[sudo] hasło użytkownika zbyszek:
cze 01 10:59:10 titanlinux kernel: intel_pstate: Intel P-state driver initializing
cze 01 10:59:10 titanlinux kernel: intel_pstate: Disabling energy efficiency optimization
cze 01 10:59:10 titanlinux kernel: intel_pstate: HWP enabled
...but if that's true, then what intel_cstate module is responsible for?
P.S. The command you gave doesn't seem to be found anywhere in the document I've linked.
"... being a Linux user is sort of like living in a house inhabited by a large family of carpenters and architects. Every morning when you wake up, the house is a little different. Maybe there is a new turret, or some walls have moved. Or perhaps someone has temporarily removed the floor under your bed."
MSI Raider GE78HX 13VI-032PL
Offline