Takuya ASADA 6eb9344cb3 dist: introduce scylla-tune-sched.service to tune kernel scheduler ...

On /usr/lib/sysctl.d/99-scylla-sched.conf, we have some sysctl settings to
tune the scheduler for lower latency.
This is mostly to prevent softirq threads processing tcp and reactor threads
from injecting latency into each other.
However, these parameters are moved to debugfs from linux-5.13+, so we lost
scheduler tuneing on recent kernels.

To support tuning recent kernel, let's add a new service which support
to configure both sysctl and debugfs.
The service named scylla-tune-sched.service
The service will unconditionally enables when installed, on older kernel
it will tune via sysctl, on recent kernel it will tune via debugfs.

Fixes #16077

Closes scylladb/scylladb#16122

2023-12-04 19:29:46 +02:00

..

99-scylla-aio.conf

…

99-scylla-filemax.conf

…

99-scylla-inotify.conf

…

99-scylla-vm.conf

dist: sysctl: increase vm.vfs_cache_pressure

2023-07-10 21:24:57 +03:00