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    SubjectRe: odd memory behaviour in 2.4.15
    > I have a separate linux machine with identical hardware
    > running 2.4.15 which also ran well, until I upgraded its
    > memory to 4GB. Then it ran 3 times slower than with 1 GB of RAM.

    We end up copying data around a lot more with the 4 or 64Gb kernels. Some of
    this unneccessarily. It may be down to your workload it might be a vm
    quirk. Do the boxes all run the same workload.

    Jens Axboe has patches for some setups that basically kill the slowdown
    for all cases providing your I/O controller is sane
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