But for other configurations it is worse: config NO_HZ_FULL bool "Full dynticks system (tickless)" ... This is implemented at the expense of some overhead in user <-> kernel transitions: syscalls, exceptions and interrupts. Even when it's dynamically off. Say N.
Upstream commit 176b8906 changed the description regarding NO_HZ_FULL: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=176b8906c399a170886ea4bad5b24763c6713d61 > By default, without passing the nohz_full parameter, this behaves just > like NO_HZ_IDLE. > > If you're a distro say Y.