On Mon, May 23, 2022 at 8:17 PM Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx> wrote: > > Update documentation for using the tool to support performance level > change via OOB (Out of Band) interface. > > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx> > --- > v2: > As suggested by Jonathan > - Indent literal block > - Show output of command > > .../admin-guide/pm/intel-speed-select.rst | 22 +++++++++++++++++++ > 1 file changed, 22 insertions(+) > > 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 > --------------------------------------------- > > -- Applied as 5.19-rc material, thanks!
