Yeah, I know what you are saying. I started on FreeBSD Jails; and god damn, that was /hard/ - the heavy disk users would wipe out everyone else's cache, an

Yeah, I know what you are saying. I started on FreeBSD Jails; and god damn, that was /hard/ - the heavy disk users would wipe out everyone else's cache, and so for the light users, when they logged in? the system would behave as if it did not have any pagecache. Moving to Xen, even without doing any I/O limiting, was world changing, simply because heavy users could not overwrite the pagecache used by light users.