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    SubjectRe: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
    Ingo Molnar wrote:
    > the ext3 -> ext4 patches add +2115 lines of code (which 2115 lines solve
    > the biggest performance and scaling problem ext3 currently has), which
    > is 1.9% of the linecount of XFS.

    Indeed!


    > ext3 does quite a few things to stay compatible with ext2 - and frankly,
    > i very much expected it to do that when i migrated my ext2 data to ext3.
    > The days of "change the world in an incompatible way and dont look back"
    > are gone.

    I agree with your point in the thread -- most users and distros don't
    change their main fs on a whim. But I also point out that these
    extent+48bit changes _do_ change the format in an incompatible way...

    Jeff


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