This is likely due to differences in mysql between 5.5 and 5.6 on how memory allocation around the use of max_connections works; with performance_scheme enabled (the default), the server will allocate alot more memory on startup resulting in the increased footprint on xenial compared to trusty.
This is likely due to differences in mysql between 5.5 and 5.6 on how memory allocation around the use of max_connections works; with performance_scheme enabled (the default), the server will allocate alot more memory on startup resulting in the increased footprint on xenial compared to trusty.