I can no longer edit the above article, and I just realized that I made a very critical typo. When I wrote: "XFS in particular have proven to be a memory hog, and others have noted severe performance degredations and in some cases stability problems, under memory pressure", I had intended to say that "ZFS in particular..."
My apologies to the XFS developers and fans of XFS. I currently have no information about how XFS behaves under extreme memory pressure. I don't find competitive benchmarking to be all that interesting, so I've never gotten around to do that experiment. My information about ZFS requiring lots of memory for good performance/stability was taken from an Open Solaris mailing list, and not from personal experience, just to be clear.
My apologies to the XFS developers and fans of XFS. I currently have no information about how XFS behaves under extreme memory pressure. I don't find competitive benchmarking to be all that interesting, so I've never gotten around to do that experiment. My information about ZFS requiring lots of memory for good performance/stability was taken from an Open Solaris mailing list, and not from personal experience, just to be clear.