I understand you are looking for a list of Intel® processor supporting P-States.
This information does not seem to be available at intel.com web site, I am going to review this matter. This thread will be updated as news become available.
actually I guess that P-states are available on all modern Intel processors, but I am interested in the ones supporting these flags:
hwp: Intel Hardware P-states
hwp_notify: HWP notification
hwp_act_window: HWP Activity Window
hwp_epp: HWP Energy Performance Preference
hwp_pkg_req: HWP package-level request
Thanks and Best Regards,
Thank you for your patience.
Based on the information I was able to get, I understand that all processors supporting Enhanced Intel SpeedStep Technology (EIST) support P-States and the flags you mentioned previously.
This can be confirmed at
See (Table 3-8, Vol 2A 3-193)
I have filtered processor with EIST for more information:
Hope this information is helpful.
I actually initially believed the same thing, but:
I am able to run on a Intel Xeon E5-2630v3 which accordingly to this: Intel® Xeon® Processor E5-2630 v3 (20M Cache, 2.40 GHz) Product Specifications should support Enhanced Intel SpeedStep Technology (EIST), anyhow /proc/cpuinfo do not reports these flags and indeed cpuid confirms:
Thermal and Power Management Features (6):
digital thermometer = true
Intel Turbo Boost Technology = true
ARAT always running APIC timer = true
PLN power limit notification = true
ECMD extended clock modulation duty = true
PTM package thermal management = true
HWP base registers = false
HWP notification = false
HWP activity window = false
HWP energy performance preference = false
HWP package level request = false
HDC base registers = false
digital thermometer thresholds = 0x2 (2)
ACNT/MCNT supported performance measure = true
ACNT2 available = false
performance-energy bias capability = true
thus I am afraid that the support for Enhanced Intel SpeedStep Technology (EIST) do not imply the support for HWP...
That's unfortunate. Indeed the processor supports EIST, since this feature is enabled at BIOS level, please make sure you check this option just to confirm this is enabled.
Additionally, try updating to the latest computer BIOS and check again.
I would like to have additional information about your system configuration. Please run the following utility and attach the results.
Intel® System Support Utility
In order to attach files, make sure you select the "Advanced Editor" option in the top right of your reply window. You will then be presented with an attach file dialogue at the bottom of the reply.
unfortunately Intel System Support Utility is not available for Linux... anyhow, as soon as I'll have physical access to the machine, I'll try to look in the BIOS for settings related to EIST and/or HWP... as soon as I have some news I will let you know.
Thanks and Best Regards,
Yes, for Linux you can run the following command:
dmidecode > nucinfo.txt
Thank you, please do let me know if you need further assistance with your Intel product, I will be glad to assist you.