When using PMD Power Management, scale mode reacts slower than
monitor mode and pause mode. Add note in user guide to this
effect.
Signed-off-by: David Hunt <david.hunt@intel.com>
---
doc/guides/prog_guide/power_man.rst | 4 +++-
doc/guides/sample_app_ug/l3_forward_power_man.rst | 5 +++--
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/doc/guides/prog_guide/power_man.rst b/doc/guides/prog_guide/power_man.rst
index e387d7811e..66592cf22f 100644
--- a/doc/guides/prog_guide/power_man.rst
+++ b/doc/guides/prog_guide/power_man.rst
@@ -216,7 +216,9 @@ power saving whenever empty poll count reaches a certain number.
* Frequency scaling
This power saving scheme will use ``librte_power`` library functionality to
- scale the core frequency up/down depending on traffic volume.
+ scale the core frequency up/down depending on traffic volume. The reaction
+ time of the frequency scaling mode is longer than the pause and monitor
+ mode.
The "monitor" mode is only supported in the following configurations and scenarios:
diff --git a/doc/guides/sample_app_ug/l3_forward_power_man.rst b/doc/guides/sample_app_ug/l3_forward_power_man.rst
index 8817eaadbf..84b014fab5 100644
--- a/doc/guides/sample_app_ug/l3_forward_power_man.rst
+++ b/doc/guides/sample_app_ug/l3_forward_power_man.rst
@@ -345,8 +345,9 @@ and has three available power management schemes:
to avoid busy looping when there is no traffic.
``scale``
- This will use frequency scaling routines
- available in the ``librte_power`` library.
+ This will use frequency scaling routines available in
+ the ``librte_power`` library. The reaction time of the
+ scale mode is longer than the pause and monitor mode.
See :doc:`Power Management<../prog_guide/power_man>` chapter
in the DPDK Programmer's Guide for more details on PMD power management.
--
2.17.1