Loading Documentation/admin-guide/pm/intel-speed-select.rst +22 −0 Original line number Diff line number Diff line Loading @@ -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 --------------------------------------------- Loading Loading
Documentation/admin-guide/pm/intel-speed-select.rst +22 −0 Original line number Diff line number Diff line Loading @@ -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 --------------------------------------------- Loading
