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