Name
migration_cost — Override the default scheduler migrations costs.
Synopsis
migration_cost=
level-1-useconds
[
level-2-useconds
...]
Description
This is a debugging option that overrides the default scheduler
migration cost matrix. The numbers specified by
level-N-useconds
are indexed by
the "CPU domain distance" and are measured in microseconds.
An example of this option is
migration_cost=1000,2000,3000 for a SMT NUMA
machine. It sets up an intra-core migration cost of 1 ms, another
inter-core migration cost of 2 ms, and another internode migration
cost of 3 ms.
Warning
Incorrect values can severely degrade scheduler
performance, so this option should be used only for scheduler
development, never for production environments.
