From dc9e7860df91625fef04d7016182653e8f678f05 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Wed, 30 Sep 2020 22:05:47 +0800 Subject: docs: mm: numaperf.rst Add brief description for access class 1. Try to make minimal changes to the document which already describes access class 0 in a generic fashion (including IO initiatiors that are not CPUs). Signed-off-by: Jonathan Cameron Signed-off-by: Rafael J. Wysocki --- Documentation/admin-guide/mm/numaperf.rst | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'Documentation/admin-guide') diff --git a/Documentation/admin-guide/mm/numaperf.rst b/Documentation/admin-guide/mm/numaperf.rst index 4d69ef1de830..86f2a3c4b638 100644 --- a/Documentation/admin-guide/mm/numaperf.rst +++ b/Documentation/admin-guide/mm/numaperf.rst @@ -56,6 +56,11 @@ nodes' access characteristics share the same performance relative to other linked initiator nodes. Each target within an initiator's access class, though, do not necessarily perform the same as each other. +The access class "1" is used to allow differentiation between initiators +that are CPUs and hence suitable for generic task scheduling, and +IO initiators such as GPUs and NICs. Unlike access class 0, only +nodes containing CPUs are considered. + ================ NUMA Performance ================ @@ -88,6 +93,9 @@ The latency attributes are provided in nanoseconds. The values reported here correspond to the rated latency and bandwidth for the platform. +Access class 1 takes the same form but only includes values for CPU to +memory activity. + ========== NUMA Cache ========== -- cgit v1.2.3