On 21/09/20 08:24, Vincent Guittot wrote: > The 25% default imbalance threshold for DIE and NUMA domain is large > enough to generate significant unfairness between threads. A typical > example is the case of 11 threads running on 2x4 CPUs. The imbalance of > 20% between the 2 groups of 4 cores is just low enough to not trigger > the load balance between the 2 groups. We will have always the same 6 > threads on one group of 4 CPUs and the other 5 threads on the other > group of CPUS. With a fair time sharing in each group, we ends up with > +20% running time for the group of 5 threads. > > Consider decreasing the imbalance threshold for overloaded case where we > use the load to balance task and to ensure fair time sharing. > > Acked-by: Hillf Danton <hdan...@sina.com> > Reviewed-by: Phil Auld <pa...@redhat.com> > Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org>
Reviewed-by: Valentin Schneider <valentin.schnei...@arm.com>
