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    SubjectRe: Wrong DIF guard tag on ext2 write
    On Mon, Jun 07, 2010 at 01:40:21PM -0400, Martin K. Petersen wrote:
    > >>>>> "Boaz" == Boaz Harrosh <bharrosh@panasas.com> writes:
    >
    > Boaz> Do you remember some performance numbers that show degradation /
    > Boaz> sameness?
    >
    > Boaz> What type of work loads?
    >
    > I haven't been using XFS much for over a year. I'm using an internal
    > async I/O tool and btrfs for most of my DIX/DIF testing these days.
    >
    > But my original changes were along the lines of what Jan mentioned
    > earlier (hooking into page_mkwrite and waiting for writeback. I could
    > have sworn that I only did it for ext[23] and that XFS waited out of the
    > box but git proves me wrong). Anyway, I'll try to get some benchmarking
    > happening later this week.

    Is there a patch with this change available somewhere? It might be
    useful to patch a kernel with this XFS change for reliable DIF/DIX
    testing.

    > This won't fix things completely, though. ext2fs, for instance,
    > frequently changes metadata buffers in flight so it trips the guard
    > check in no time.
    >
    > --
    > Martin K. Petersen Oracle Linux Engineering
    > --
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