On Sun, Apr 25, 2021 at 12:39 PM Artem Tim <ego.cordatus(a)gmail.com> wrote:
Hello.
Upcoming 5.12 allow building with dynamic preemption support which allows changing mode
at boot/run-time so finally no need to rebuild or make alternative kernel build
anymore[1]. Responsive system is a must have for gaming and good desktop experience
overall, not only for professional audio. For example difference in input mouse lag is
like day and night with PREEMPT mode. Maybe on cheap mouse this is hard to notice but on
500-1000Hz mouse really easy. You can test this yourself with experimental kernel build on
COPR[2]. Some Linux distros[3] already using PREEMPT mode by default for a decent period
of time. Fedora kernel build with CONFIG_PREEMPT_VOLUNTARY but this is not enough for
desktop use case.
Please provide full PREEMPT mode by default in 5.12 kernel for desktop variants. With
5.12 it is possible for user to change it without efforts if they need this.
I see CONFIG_HAVE_PREEMPT_DYNAMIC=y with kernel
5.12.0-0.rc8.191.fc35.x86_64+debug.
--
Chris Murphy