From 561e0301061a364e304367ab0aba6e2ad02a41fe Mon Sep 17 00:00:00 2001 From: David Hunt Date: Thu, 2 May 2019 12:18:13 +0100 Subject: [PATCH] doc: add SST-BF info In the Power Library, a new bit has been added to the mask returned by rte_power_get_capabilities which indicates whether the core is an Intel SST-BF high frequency core. The distributor sample application has been enhanced to be aware of Intel SST-BF high frequency cores. Docs also contain a link to the Intel SST-BF application note. Signed-off-by: David Hunt Acked-by: John McNamara --- doc/guides/rel_notes/release_19_05.rst | 11 +++++++++++ doc/guides/sample_app_ug/dist_app.rst | 20 +++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletion(-) diff --git a/doc/guides/rel_notes/release_19_05.rst b/doc/guides/rel_notes/release_19_05.rst index 468e325395..01a55557c4 100644 --- a/doc/guides/rel_notes/release_19_05.rst +++ b/doc/guides/rel_notes/release_19_05.rst @@ -200,6 +200,17 @@ New Features Improved testpmd application performance on ARM platform. For ``macswap`` forwarding mode, NEON intrinsics were used to do swap to save CPU cycles. +* **Updated power management library.** + + Added support for Intel Speed Select Technology - Base Frequency (SST-BF). + ``rte_power_get_capabilities`` now has a bit in it's returned mask + indicating it's a high frequency core. + +* **Updated distributor sample application.** + + Added support for Intel SST-BF feature so that the distributor core is + pinned to a high frequency core if available. + Removed Items ------------- diff --git a/doc/guides/sample_app_ug/dist_app.rst b/doc/guides/sample_app_ug/dist_app.rst index abfdd2c5e1..90270e3a58 100644 --- a/doc/guides/sample_app_ug/dist_app.rst +++ b/doc/guides/sample_app_ug/dist_app.rst @@ -5,7 +5,9 @@ Distributor Sample Application ============================== The distributor sample application is a simple example of packet distribution -to cores using the Data Plane Development Kit (DPDK). +to cores using the Data Plane Development Kit (DPDK). It also makes use of +Intel Speed Select Technology - Base Frequency (Intel SST-BF) to pin the +distributor to the higher frequency core if available. Overview -------- @@ -101,6 +103,22 @@ final statistics to the user. Distributor Sample Application Layout +Intel SST-BF Support +-------------------- + +In DPDK 19.05, support was added to the power management library for +Intel-SST-BF, a technology that allows some cores to run at a higher +frequency than others. An application note for Intel SST-BF is available, +and is entitled +`Intel Speed Select Technology – Base Frequency - Enhancing Performance `_ + +The distributor application was also enhanced to be aware of these higher +frequency SST-BF cores, and when starting the application, if high frequency +SST-BF cores are present in the core mask, the application will identify these +cores and pin the workloads appropriately. The distributor core is usually +the bottleneck, so this is given first choice of the high frequency SST-BF +cores, followed by the rx core and the tx core. + Debug Logging Support --------------------- -- 2.20.1