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[v8,10/10] doc: update programmer's guide for power library

Message ID 1603474618-18599-1-git-send-email-liang.j.ma@intel.com (mailing list archive)
State Superseded, archived
Headers
Series None |

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Context Check Description
ci/checkpatch success coding style OK

Commit Message

Liang, Ma Oct. 23, 2020, 5:36 p.m. UTC 
  Update programmer's guide to document PMD power management usage.

Signed-off-by: Liang Ma <liang.j.ma@intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Acked-by: David Hunt <david.hunt@intel.com>
---
 doc/guides/prog_guide/power_man.rst | 42 +++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
diff mbox series

Patch

diff --git a/doc/guides/prog_guide/power_man.rst b/doc/guides/prog_guide/power_man.rst
index 0a3755a901..38c64d31e4 100644
--- a/doc/guides/prog_guide/power_man.rst
+++ b/doc/guides/prog_guide/power_man.rst
@@ -192,6 +192,45 @@  User Cases
 ----------
 The mechanism can applied to any device which is based on polling. e.g. NIC, FPGA.
 
+PMD Power Management API
+------------------------
+
+Abstract
+~~~~~~~~
+Existing power management mechanisms require developers to change application
+design or change code to make use of it. The PMD power management API provides a
+convenient alternative by utilizing Ethernet PMD RX callbacks, and triggering
+power saving whenever empty poll count reaches a certain number.
+
+  * UMWAIT/UMONITOR
+
+   This power saving scheme will put the CPU into optimized power state and use
+   the UMWAIT/UMONITOR instructions to monitor the Ethernet PMD RX descriptor
+   address, and wake the CPU up whenever there's new traffic.
+
+  * Pause
+
+   This power saving scheme will use the `rte_pause` function to avoid busy
+   polling.
+
+  * Frequency scaling
+
+   This power saving scheme will use existing power library functionality to
+   scale the core frequency up/down depending on traffic volume.
+
+
+.. note::
+
+   Currently, this power management API is limited to mandatory mapping of 1
+   queue to 1 core (multiple queues are supported, but they must be polled from
+   different cores).
+
+API Overview for PMD Power Management
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+* **Queue Enable**: Enable specific power scheme for certain queue/port/core
+
+* **Queue Disable**: Disable power scheme for certain queue/port/core
+
 References
 ----------
 
@@ -200,3 +239,6 @@  References
 
 *   The :doc:`../sample_app_ug/vm_power_management`
     chapter in the :doc:`../sample_app_ug/index` section.
+
+*   The :doc:`../sample_app_ug/rxtx_callbacks`
+    chapter in the :doc:`../sample_app_ug/index` section.