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    SubjectRe: dentry cache leak? Re: rsync out of memory 2.6.8-rc2
    Andrew Morton wrote:

    >kladit@t-online.de (Klaus Dittrich) wrote:
    >
    >
    >>>Can you narrow the onset of the problem down to any particular kernel
    >>>
    >>>
    >> >snapshot?
    >>
    >> Did it and here is the answer.
    >>
    >> kernel-2.6.7 and bk's up to 2.6.7-bk7 survived a du -s,
    >> kernels starting with 2.6.7-bk8 did not.
    >>
    >>
    >
    >Dammit, -bk7 to -bk8 is a 1.8M diff. Relevant changes include the switch
    >to the rcu callbacks (make them take an rcu_head* rather than a void*) and
    >the introduction of /proc/sys/vm/vfs_cache_pressure.
    >
    >So the immediate question is: please check the contents of your
    >vfs_cache_pressure tunable. It should be 100. A setting of zero would
    >cause this behaviour.
    >
    >
    >
    >> Compiler gcc-3.4.1
    >>
    >>
    >
    >It would be useful to try a different compiler version.
    >
    >There's _something_ different in your setup. If we can work out what this
    >factor is, it will lead us to the bug.
    >
    >
    >

    cat /proc/sys/vm/vfs_cache_pressure shows 100.
    Should I try an older or newer compiler ?

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