On 10/22/2018 1:06 PM, Peter Zijlstra wrote: > On Mon, Oct 22, 2018 at 07:59:40AM -0700, Steve Sistare wrote: >> The STEAL feature causes regressions on hackbench on larger NUMA systems, >> so disable it on systems with more than sched_steal_node_limit nodes >> (default 2). > > How come? From a quick read the stealing is per LLC, where do we steal > across nodes?
See the complete explanation in this patch. It is deeper than can be gleaned from a quick read. - Steve
