sched/doc: Update documentation for base_slice_ns and CONFIG_HZ relation

[sfrench/cifs-2.6.git] / Documentation / scheduler / sched-design-CFS.rst

diff --git a/Documentation/scheduler/sched-design-CFS.rst b/Documentation/scheduler/sched-design-CFS.rst
index 6cffffe265006e8b71751649dc06e99852fb507e..e030876fbd689265b276f72a0126c08c2facd1c6 100644 (file)
--- a/Documentation/scheduler/sched-design-CFS.rst
+++ b/Documentation/scheduler/sched-design-CFS.rst
@@ -100,6 +100,9 @@ which can be used to tune the scheduler from "desktop" (i.e., low latencies) to
 "server" (i.e., good batching) workloads.  It defaults to a setting suitable
 for desktop workloads.  SCHED_BATCH is handled by the CFS scheduler module too.
 
+In case CONFIG_HZ results in base_slice_ns < TICK_NSEC, the value of
+base_slice_ns will have little to no impact on the workloads.
+
 Due to its design, the CFS scheduler is not prone to any of the "attacks" that
 exist today against the heuristics of the stock scheduler: fiftyp.c, thud.c,
 chew.c, ring-test.c, massive_intr.c all work fine and do not impact