Изменения

* There are 2 parameters responsible for OSD worker thread count — osd_op_num_shards and osd_op_num_threads_per_shard…

* …But trying to tune them is pointless, default configuration (1x5 for HDDs and 2x8 for SSDs) is optimal. The problem is that all worker threads still serialize writes into a single kv_sync_thread, and the whole scheme only scales up to ~6 worker threads.

** <tt>cpupower idle-set -D 1</tt> — this disables C-States (or you can pass <tt>processor.max_cstate=1 intel_idle.max_cstate=0</tt> to the kernel command-line)

** <tt>for i in $(seq 0 $((`nproc`-1))); do cpufreq-set -c $i -g performance; done</tt> — this disables frequency scaling.