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    SubjectRe: [PATCH 0/4] (RESEND) ext3[34] barrier changes
    Date
    On Sunday 18 May 2008, Andi Kleen wrote:
    > Andrew Morton <akpm@linux-foundation.org> writes:
    > > On Fri, 16 May 2008 14:02:46 -0500
    > >
    > > Eric Sandeen <sandeen@redhat.com> wrote:
    > >> A collection of patches to make ext3 & 4 use barriers by
    > >> default, and to call blkdev_issue_flush on fsync if they
    > >> are enabled.
    > >
    > > Last time this came up lots of workloads slowed down by 30% so I
    > > dropped the patches in horror.
    >
    > 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.

    -chris


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