* [PATCH v2] Documentation: admin-guide: pm: Add Out of Band mode
@ 2022-05-23 18:16 Srinivas Pandruvada
2022-05-25 13:50 ` Rafael J. Wysocki
0 siblings, 1 reply; 2+ messages in thread
From: Srinivas Pandruvada @ 2022-05-23 18:16 UTC (permalink / raw)
To: rafael, corbet, hdegoede, markgross
Cc: lenb, linux-kernel, linux-pm, linux-doc, platform-driver-x86,
prarit, Srinivas Pandruvada
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>
---
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
---------------------------------------------
--
2.35.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] Documentation: admin-guide: pm: Add Out of Band mode
2022-05-23 18:16 [PATCH v2] Documentation: admin-guide: pm: Add Out of Band mode Srinivas Pandruvada
@ 2022-05-25 13:50 ` Rafael J. Wysocki
0 siblings, 0 replies; 2+ messages in thread
From: Rafael J. Wysocki @ 2022-05-25 13:50 UTC (permalink / raw)
To: Srinivas Pandruvada
Cc: Rafael J. Wysocki, Jonathan Corbet, Hans de Goede, Mark Gross,
Len Brown, Linux Kernel Mailing List, Linux PM,
open list:DOCUMENTATION, Platform Driver, Prarit Bhargava
On Mon, May 23, 2022 at 8:17 PM Srinivas Pandruvada
<srinivas.pandruvada@linux.intel.com> 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@linux.intel.com>
> ---
> 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!
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2022-05-23 18:16 [PATCH v2] Documentation: admin-guide: pm: Add Out of Band mode Srinivas Pandruvada
2022-05-25 13:50 ` Rafael J. Wysocki
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