Commit 4fe4f155 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki

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: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 09583dfe
......@@ -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
---------------------------------------------
......
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