On Thu, 12 Nov 2015 17:29:35 +0000 Ben Hutchings <[email protected]> wrote: > > 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. > > I think we should enable this for the rt featureset when it's next > available, but not by default. > > Ben.
What about CONFIG_RCU_NOCB_CPU? There is currently a nasty hardware freeze / reboot bug that affects AMD Ryzen CPUs on Linux: https://bugzilla.kernel.org/show_bug.cgi?id=196683[1] Many report, that setting rcu-nocbs kernel parameter works around it at least partially, but it requires the kernel to be built with CONFIG_RCU_NOCB_CPU=Y. Can it be enabled in Debian, or there are reasons not to do it? Thanks! Hillel. -------- [1] https://bugzilla.kernel.org/show_bug.cgi?id=196683
