From 7580f97338a448f9d46f9ef1aeb1e30369cc3bf7 Mon Sep 17 00:00:00 2001 From: David Hunt Date: Wed, 24 Nov 2021 16:53:00 +0000 Subject: [PATCH] doc: add power management scale mode reaction time note 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 --- doc/guides/prog_guide/power_man.rst | 2 ++ doc/guides/sample_app_ug/l3_forward_power_man.rst | 2 ++ 2 files changed, 4 insertions(+) diff --git a/doc/guides/prog_guide/power_man.rst b/doc/guides/prog_guide/power_man.rst index e387d7811e..4484a94dc8 100644 --- a/doc/guides/prog_guide/power_man.rst +++ b/doc/guides/prog_guide/power_man.rst @@ -217,6 +217,8 @@ 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. + 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..2e350c45f1 100644 --- a/doc/guides/sample_app_ug/l3_forward_power_man.rst +++ b/doc/guides/sample_app_ug/l3_forward_power_man.rst @@ -347,6 +347,8 @@ and has three available power management schemes: ``scale`` 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. -- 2.39.5