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authorVincent Guittot <vincent.guittot@linaro.org>2020-09-21 09:24:24 +0200
committerPeter Zijlstra <peterz@infradead.org>2020-09-25 14:23:26 +0200
commit6e7499135db724539ca887b3aa64122502875c71 (patch)
treec65784c05da1e19e116153a0f8dddf3fa0327081 /kernel/sched
parente4d32e4d5444977d8dc25fa98b3ce0a65544db8c (diff)
downloadlinux-6e7499135db724539ca887b3aa64122502875c71.tar.bz2
sched/fair: Reduce busy load balance interval
The busy_factor, which increases load balance interval when a cpu is busy, is set to 32 by default. This value generates some huge LB interval on large system like the THX2 made of 2 node x 28 cores x 4 threads. For such system, the interval increases from 112ms to 3584ms at MC level. And from 228ms to 7168ms at NUMA level. Even on smaller system, a lower busy factor has shown improvement on the fair distribution of the running time so let reduce it for all. Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Phil Auld <pauld@redhat.com> Link: https://lkml.kernel.org/r/20200921072424.14813-5-vincent.guittot@linaro.org
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/topology.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 41df62884cea..a3a2417fec54 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1348,7 +1348,7 @@ sd_init(struct sched_domain_topology_level *tl,
*sd = (struct sched_domain){
.min_interval = sd_weight,
.max_interval = 2*sd_weight,
- .busy_factor = 32,
+ .busy_factor = 16,
.imbalance_pct = 117,
.cache_nice_tries = 0,