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    SubjectRe: [PATCH 0/4] (RESEND) ext3[34] barrier changes
    On Mon, May 19, 2008 at 09:26:41AM -0400, Chris Mason wrote:
    > >
    > > Didn't ext4 have some new checksum trick to avoid them?
    > I didn't think checksumming avoided barriers completely. Just the barrier
    > before the commit block, not the barrier after.

    Funny thing, I was looking in this over the weekend. It currently
    avoids barriers entirely if journal_async_commit is enabled (which is
    not the default); if enabled, it effectively forces barrier=0. This
    is IMHO a bug.

    I'm working on a patch where "barrier=1" will use a barrier before and
    after, and "barrier=1,journal_async_commit" will use a barrier after.

    - Ted

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