Hi Anatoly, On 14/1/2021 2:46 PM, Anatoly Burakov wrote:
From: Liang Ma <[email protected]>Add a simple on/off switch that will enable saving power when no packets are arriving. It is based on counting the number of empty polls and, when the number reaches a certain threshold, entering an architecture-defined optimized power state that will either wait until a TSC timestamp expires, or when packets arrive. This API mandates a core-to-single-queue mapping (that is, multiple queued per device are supported, but they have to be polled on different cores). This design is using PMD RX callbacks. 1. UMWAIT/UMONITOR: When a certain threshold of empty polls is reached, the core will go into a power optimized sleep while waiting on an address of next RX descriptor to be written to. 2. TPAUSE/Pause instruction This method uses the pause (or TPAUSE, if available) instruction to avoid busy polling. 3. Frequency scaling Reuse existing DPDK power library to scale up/down core frequency depending on traffic volume. Signed-off-by: Liang Ma <[email protected]> Signed-off-by: Anatoly Burakov <[email protected]> --- Notes: v17: - Added memory barriers suggested by Konstantin - Removed the BUSY state doc/guides/prog_guide/power_man.rst | 44 +++ doc/guides/rel_notes/release_21_02.rst | 10 + lib/librte_power/meson.build | 5 +- lib/librte_power/rte_power_pmd_mgmt.c | 364 +++++++++++++++++++++++++ lib/librte_power/rte_power_pmd_mgmt.h | 90 ++++++ lib/librte_power/version.map | 5 + 6 files changed, 516 insertions(+), 2 deletions(-) create mode 100644 lib/librte_power/rte_power_pmd_mgmt.c create mode 100644 lib/librte_power/rte_power_pmd_mgmt.h
Acked-by: David Hunt <[email protected]>
