From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
<viresh.kumar@linaro.org>, <Ray.Huang@amd.com>,
<gautham.shenoy@amd.com>, <Borislav.Petkov@amd.com>
Cc: <Alexander.Deucher@amd.com>, <Xinmei.Huang@amd.com>,
<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v10 7/7] Documentation: cpufreq: amd-pstate: update doc for Per CPU boost control method
Date: Wed, 8 May 2024 15:21:12 +0800 [thread overview]
Message-ID: <8661e4fb9a0473bbe74fd9ad008e19380743b46d.1715152592.git.perry.yuan@amd.com> (raw)
In-Reply-To: <cover.1715152592.git.perry.yuan@amd.com>
Updates the documentation in `amd-pstate.rst` to include information about the
per CPU boost control feature. Users can now enable or disable the Core Performance
Boost (CPB) feature on individual CPUs using the `boost` sysfs attribute.
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
---
Documentation/admin-guide/pm/amd-pstate.rst | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index bcc0d9404c18..98e43c53c387 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -281,6 +281,26 @@ integer values defined between 0 to 255 when EPP feature is enabled by platform
firmware, if EPP feature is disabled, driver will ignore the written value
This attribute is read-write.
+``boost``
+The `boost` sysfs attribute provides control over the CPU core
+performance boost, allowing users to manage the maximum frequency limitation
+of the CPU. This attribute can be used to enable or disable the boost feature
+on individual CPUs.
+
+When the boost feature is enabled, the CPU can dynamically increase its frequency
+beyond the base frequency, providing enhanced performance for demanding workloads.
+On the other hand, disabling the boost feature restricts the CPU to operate at the
+base frequency, which may be desirable in certain scenarios to prioritize power
+efficiency or manage temperature.
+
+To manipulate the `boost` attribute, users can write a value of `0` to disable the
+boost or `1` to enable it, for the respective CPU using the sysfs path
+`/sys/devices/system/cpu/cpuX/cpufreq/boost`, where `X` represents the CPU number.
+
+It is important to note that modifying the global variable
+`amd_pstate_global_params.cpb_boost` will override the individual CPU settings.
+
+
Other performance and frequency values can be read back from
``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`.
--
2.34.1
next prev parent reply other threads:[~2024-05-08 7:21 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-08 7:21 [PATCH v10 0/7] AMD Pstate Driver Core Performance Boost Perry Yuan
2024-05-08 7:21 ` [PATCH v10 1/7] cpufreq: acpi: move MSR_K7_HWCR_CPB_DIS_BIT into msr-index.h Perry Yuan
2024-05-08 7:21 ` [PATCH v10 2/7] cpufreq: amd-pstate: initialize new core precision boost state Perry Yuan
2024-05-08 7:21 ` [PATCH v10 3/7] cpufreq: amd-pstate: implement cpb_boost sysfs entry for boost control Perry Yuan
2024-05-08 9:39 ` Oleksandr Natalenko
2024-05-08 11:42 ` Yuan, Perry
2024-05-08 7:21 ` [PATCH v10 4/7] cpufreq: amd-pstate: fix the MSR highest perf will be reset issue while cpb boost off Perry Yuan
2024-05-08 7:21 ` [PATCH v10 5/7] Documentation: cpufreq: amd-pstate: introduce the new cpu boost control method Perry Yuan
2024-05-08 7:21 ` [PATCH v10 6/7] cpufreq: amd-pstate: introduce per CPU frequency boost control Perry Yuan
2024-05-08 9:34 ` Oleksandr Natalenko
2024-05-08 9:43 ` Oleksandr Natalenko
2024-05-08 12:20 ` Yuan, Perry
2024-05-08 7:21 ` Perry Yuan [this message]
2024-05-08 8:18 ` [PATCH v10 0/7] AMD Pstate Driver Core Performance Boost Borislav Petkov
2024-05-09 16:01 ` Yuan, Perry
2024-05-09 16:12 ` Borislav Petkov
2024-05-08 15:11 ` Oleksandr Natalenko
2024-05-08 19:13 ` Oleksandr Natalenko
2024-05-08 19:21 ` Oleksandr Natalenko
2024-05-08 21:31 ` Oleksandr Natalenko
2024-05-08 22:13 ` Mario Limonciello
2024-05-09 12:01 ` Oleksandr Natalenko
2024-05-09 16:03 ` Yuan, Perry
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=8661e4fb9a0473bbe74fd9ad008e19380743b46d.1715152592.git.perry.yuan@amd.com \
--to=perry.yuan@amd.com \
--cc=Alexander.Deucher@amd.com \
--cc=Borislav.Petkov@amd.com \
--cc=Li.Meng@amd.com \
--cc=Mario.Limonciello@amd.com \
--cc=Ray.Huang@amd.com \
--cc=Xiaojian.Du@amd.com \
--cc=Xinmei.Huang@amd.com \
--cc=gautham.shenoy@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=rafael.j.wysocki@intel.com \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).