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| author | Vincent Guittot <vincent.guittot@linaro.org> | 2020-09-21 09:24:24 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-09-25 14:23:26 +0200 |
| commit | 6e7499135db724539ca887b3aa64122502875c71 (patch) | |
| tree | c65784c05da1e19e116153a0f8dddf3fa0327081 /kernel/sched | |
| parent | e4d32e4d5444977d8dc25fa98b3ce0a65544db8c (diff) | |
| download | linux-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.c | 2 |
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, |