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    SubjectRe: [RFC][PATCH 0/3] Skip I/O merges when disabled

    > Not a good idea IMHO, it's much better with an explicit setting. That
    > way you don't introduce indeterministic behavior.

    So you would be deterministically slower.

    Another way to avoid this problem would be to keep the statistics per
    IO context, then the same run of a program would always get the same
    behaviour. Drawback is that if your non mergeable workload consists of
    lots of short running processes (like a shell script) the optimization
    wouldn't work. Not sure if it's really practical, but it would be an option.

    I think in modern systems with caches etc. you typically have enough
    non quite deterministic and other surprising and hard to analyze
    behaviour anyways, so a little more doesn't make much difference.


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