Comment 3 for bug 1590430

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James Page (james-page) wrote : Re: distinct memory usage in xenial compared to trusty deployment

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.