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    SubjectRe: kupdate weirdness
    On Wed, 01 Aug 2007 22:45:16 +0200
    Miklos Szeredi <miklos@szeredi.hu> wrote:

    > The following strange behavior can be observed:
    >
    > 1. large file is written
    > 2. after 30 seconds, nr_dirty goes down by 1024
    > 3. then for some time (< 30 sec) nothing happens (disk idle)
    > 4. then nr_dirty again goes down by 1024
    > 5. repeat from 3. until whole file is written
    >
    > So basically a 4Mbyte chunk of the file is written every 30 seconds.
    > I'm quite sure this is not the intended behavior.
    >
    > The reason seems to be that __sync_single_inode() will move the
    > partially written inode from s_io onto s_dirty, and sync_sb_inode()
    > will not splice it back onto s_io until the rest of the inodes on s_io
    > has been processed.

    It does all sorts of weird crap.

    > Since there will probably be a recently dirtied inode on s_io, this
    > will take some of time, but always less than 30 sec.
    >
    > I don't know what's the easiest solution.
    >
    > Any ideas?

    Try 2.6.23-rc1-mm2.
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