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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2022-05-23 11:16:55 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-05-25 15:48:26 +0200 |
| commit | 4fe4f1552394d41442205f9cde93af00eda59435 (patch) | |
| tree | 694d71d309c5d1bb02679ef990ee532535069930 | |
| parent | 09583dfed2cb9723da31601cb7080490c2e2e2d7 (diff) | |
| download | linux-4fe4f1552394d41442205f9cde93af00eda59435.tar.gz linux-4fe4f1552394d41442205f9cde93af00eda59435.tar.bz2 linux-4fe4f1552394d41442205f9cde93af00eda59435.zip | |
Documentation: admin-guide: PM: Add Out of Band mode
Update documentation for using the tool to support performance level
change via OOB (Out of Band) interface.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | Documentation/admin-guide/pm/intel-speed-select.rst | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/admin-guide/pm/intel-speed-select.rst b/Documentation/admin-guide/pm/intel-speed-select.rst index 0a1fbdb54bfe..a2bfb971654f 100644 --- a/Documentation/admin-guide/pm/intel-speed-select.rst +++ b/Documentation/admin-guide/pm/intel-speed-select.rst @@ -262,6 +262,28 @@ Which shows that the base frequency now increased from 2600 MHz at performance level 0 to 2800 MHz at performance level 4. As a result, any workload, which can use fewer CPUs, can see a boost of 200 MHz compared to performance level 0. +Changing performance level via BMC Interface +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +It is possible to change SST-PP level using out of band (OOB) agent (Via some +remote management console, through BMC "Baseboard Management Controller" +interface). This mode is supported from the Sapphire Rapids processor +generation. The kernel and tool change to support this mode is added to Linux +kernel version 5.18. To enable this feature, kernel config +"CONFIG_INTEL_HFI_THERMAL" is required. The minimum version of the tool +is "v1.12" to support this feature, which is part of Linux kernel version 5.18. + +To support such configuration, this tool can be used as a daemon. Add +a command line option --oob:: + + # intel-speed-select --oob + Intel(R) Speed Select Technology + Executing on CPU model:143[0x8f] + OOB mode is enabled and will run as daemon + +In this mode the tool will online/offline CPUs based on the new performance +level. + Check presence of other Intel(R) SST features --------------------------------------------- |