Comments - Swap usage won't decrease
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It isn't rarely swapping but constantly since then, even though the system load has decreased.
It seems like adding a few parameters can improve this behaviour (I will have to test it first):
- innodb_buffer_pool_populate (under [mysqld] section) - flush_caches (under [mysqld_safe] section) - numa_interleave (under [mysqld_safe] section)
(taken from https://www.percona.com/doc/percona-server/5.5/performance/innodb_numa_support.html)
I don't think adding more RAM represents a workaround if the memory utilisation isn't balanced within a NUMA architecture.