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    SubjectRe: kmail slowdown on 2.6.* +reiserFS (v3)
    Chris Mason wrote:

    >On Sun, 2004-01-11 at 21:27, Andrew Morton wrote:
    >
    >
    >>Ciaby <ciaby@autistici.org> wrote:
    >>
    >>
    >>>I all!
    >>>I've recently upgraded from 2.4 to 2.6 and I've noticed a strange thing:
    >>>on the 2.4 kernel, kmail run decently (i've an old k6-200).
    >>>On the 2.6 kernel, kmail slowdown and take a very long time to read a mailbox.
    >>>I think something changed in the reiserFS during this time...
    >>>I'm not the only experiencing this problem, read this:
    >>>http://kerneltrap.org/node/view/1844
    >>>
    >>>
    >>A buglet in kmail was tripped up by some optimisations which went into
    >>reiserfs.
    >>
    >>Upgrading kmail should fix it up. Or mount the reiserfs filesystems with
    >>the `nolargeio=1' mount option.
    >>
    >>
    >
    >Actually, we've hit other problems with v3 largeio, it can confuse rpm
    >badly. The real bug is apparently in bdb, the larger io size suggested
    >by the filesystem lead bdb to corrupt its own files. I spent some time
    >neck deep in the db code but couldn't track the problem down.
    >
    >I seem to remember the XFS folks hitting exactly the same bug.
    >
    >Hans, can I talk you into having v3 export an io size of 4k to userspace
    >again? Applications that send large ios would still use Oleg's
    >optimized file write paths.
    >
    >-chris
    >
    >
    >
    >
    >
    >
    why is it you don't want to "fix" bdb to lie to itself about the result
    of statfs?

    --
    Hans


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