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Groups > linux.debian.kernel > #78022

Bug#1029484: linux: Enable Intel Uncore frequency control driver

Cross-posted to 2 groups.

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Source: linux
Version: 6.1.7-1
Severity: wishlist
X-Debbugs-Cc: miguel.bernal.marin@linux.intel.com, jair.de.jesus.gonzalez.plascencia@intel.com

Dear Maintainer,

Please enable the Intel Uncore frequency control driver.
This driver allows control of uncore frequency limits on
supported server platforms.

# Intel Uncore frequency control driver

  CONFIG_INTEL_UNCORE_FREQ_CONTROL=m

  Some server users set limits on the uncore frequency using MSR 620H, while
  running latency sensitive workloads. This driver "the uncore frequency",
  controls RING/LLC (last-level cache) clocks.

  But MSR control is not always possible from the user space, so this driver
  provides a sysfs interface to set max and min frequency limits. This MSR
  620H is a die scoped in multi-die system or package scoped in non multi-die
  systems.

  When this driver is loaded, a new directory is created under
   /sys/devices/system/cpu.

  For example on a two package Skylake server:
  $ cd /sys/devices/system/cpu/intel_uncore_frequency

  $ ls
  package_00_die_00 package_01_die_00

  $ ls package_00_die_00
  max_freq_khz  min_freq_khz  initial_max_freq_khz
  initial_min_freq_khz

  $ grep . *
      max_freq_khz:2400000
      min_freq_khz:1200000
      initial_max_freq_khz:2400000
      initial_min_freq_khz:1200000

  Here, initial_max_freq_khz and initial_min_freq_khz are read only
  attributes to show power up or initial values of max and min frequencies
  respectively. Other attributes are read-write, so that users can modify.

A merge request was created at:

https://salsa.debian.org/kernel-team/linux/-/merge_requests/645

Thanks,
Miguel

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Bug#1029484: linux: Enable Intel Uncore frequency control driver Miguel Bernal Marin <miguel.bernal.marin@gmail.com> - 2023-01-23 07:20 +0100
  Bug#1029484: marked as done (linux: Enable Intel Uncore frequency  control driver) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2023-01-29 17:10 +0100

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