Hi Tim On Thu, 24 Sep 2020 at 18:37, Tim Chen <tim.c.c...@linux.intel.com> wrote: > > > > On 9/22/20 12:14 AM, Vincent Guittot wrote: > > >> > >>>> > >>>> And a quick test with hackbench on my octo cores arm64 gives for 12 > > Vincent, > > Is it octo (=10) or octa (=8) cores on a single socket for your system?
it's a 8 cores and the cores are splitted in 2 cache domains > The L2 is per core or there are multiple L2s shared among groups of cores? > > Wonder if placing the threads within a L2 or not within > an L2 could cause differences seen with Aubrey's test. I haven't checked recently but the 2 tasks involved in sched pipe run on CPUs which belong to the same cache domain Vincent > > Tim >
