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 <[email protected]> --- 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
