So the big upgrade from 14.04 to 16.04 came up a little unexpectedly 2 weeks ago. many small package changes, and went from Percona 5.6.33-79.0-log (on 14.04) to 5.6.37-82.2-log (on 16.04) - and performance is really not very good since the upgrade. In fact, it fails to meet our minimum requirements. A mass insert process that, triggers & all included, used to run at ~7 r/s, now barely musters 0.7 r/s, a figure improved (not enough to enable the daily process to complete in under 24h) to 1.5 r/s by setting sync_master & sync_relay_log_info to 0
Has anyone else experienced this performance regression issue upgrading from Trusty to Xenial, or have any ideas where I might look to see what is going on?