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    SubjectRe: performance of filesystem xattrs with Samba4
    tridge@samba.org wrote:

    >Hans,
    >
    >A bit more information about the slowdown between runs (and eventual
    >lockup) with reiser4 that I reported in my last email.
    >
    >I found that a umount/mount between runs solved the problem, leading
    >to a fairly consistent result and no lockup. I also found that running
    >a simple /bin/sync between runs solved the problem.
    >
    >This implies to me that it is some in-memory structure that is the
    >culprit. I can't see anything obvious in /proc/slabinfo, but its been
    >a while since I've done any serious kernel development so maybe I just
    >don't know what to look for.
    >
    >I also tried enabling the "strict sync" option in Samba4. This makes
    >the 1% flush operations in the load file map to fsync() instead of a
    >noop. This caused reiser4 to lockup almost immediately, with the same
    >symptoms as the previous lockups I reported (all smbd processes stuck
    >in D state). No oops messages or anything unusual in dmesg.
    >
    >Cheers, Tridge
    >-
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    >
    >
    Thanks much tridge. vs, please respond in detail.
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