On Wed, Aug 19, 2020 at 10:23:11AM +0800, Luck, Tony wrote: > 0000000000019260 D pqr_state > > Do you have /sys/fs/resctrl mounted? This variable is read on every context > switch. > If your benchmark does a lot of context switching and this now shares a cache > line > with something different (especially something that is sometimes modified > from another > CPU) that could cause some cache line bouncing.
No, the kernel doesn't has /sys/fs/resctrl mounted. And the test case is not context switch intensive. It just forks a task for each CPU which loops running malloc/free and counts the number of complted operations for 300 seconds. Thanks, Feng
