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    SubjectRe: [Ext2-devel] disk throughput
    Andreas Dilger <> writes:
    > On Nov 05, 2001 00:04 -0800, Andrew Morton wrote:
    > > With the ialloc.c change, plus the other changes I mentioned
    > > the time to create all these directories and files and then run
    > > /bin/sync fell from 1:53 to 0:28. Fourfold.
    > In the end, though, while the old heuristic has a good theory, it _may_
    > be that in practise, you are _always_ seeking to get data from different
    > groups, rather than _theoretically_ seeking because of fragmented files.
    > I don't know what the answer is - probably depends on finding "valid"
    > benchmarks (cough).

    Another heuristic to try make be to only use a different blockgroup
    for when the mkdir()s are seperate in time. i.e. rather than
    if ( 0 && ..
    use something like
    if ((last_time + 100) < jiffes && ...
    last_time = jiffies;
    which would in theory use the old behaviour for sparodic mkdirs
    and the new behaviour for things like 'untar' et al.

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