diff options
Diffstat (limited to 'Documentation/x86')
| -rw-r--r-- | Documentation/x86/resctrl_ui.rst | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/Documentation/x86/resctrl_ui.rst b/Documentation/x86/resctrl_ui.rst index 5368cedfb530..e59b7b93a9b4 100644 --- a/Documentation/x86/resctrl_ui.rst +++ b/Documentation/x86/resctrl_ui.rst @@ -138,6 +138,18 @@ with respect to allocation: non-linear. This field is purely informational only. +"thread_throttle_mode": + Indicator on Intel systems of how tasks running on threads + of a physical core are throttled in cases where they + request different memory bandwidth percentages: + + "max": + the smallest percentage is applied + to all threads + "per-thread": + bandwidth percentages are directly applied to + the threads running on the core + If RDT monitoring is available there will be an "L3_MON" directory with the following files: @@ -364,8 +376,10 @@ to the next control step available on the hardware. The bandwidth throttling is a core specific mechanism on some of Intel SKUs. Using a high bandwidth and a low bandwidth setting on two threads -sharing a core will result in both threads being throttled to use the -low bandwidth. The fact that Memory bandwidth allocation(MBA) is a core +sharing a core may result in both threads being throttled to use the +low bandwidth (see "thread_throttle_mode"). + +The fact that Memory bandwidth allocation(MBA) may be a core specific mechanism where as memory bandwidth monitoring(MBM) is done at the package level may lead to confusion when users try to apply control via the MBA and then monitor the bandwidth to see if the controls are |