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    SubjectRe: inode cache, dentry cache, buffer heads usage
    On Wed, Mar 09, 2005 at 01:29:23PM -0800, Badari Pulavarty wrote:
    > On Wed, 2005-03-09 at 13:27, Dipankar Sarma wrote:
    > > On Wed, Mar 09, 2005 at 10:55:58AM -0800, Badari Pulavarty wrote:
    > > > Hi,
    > > >
    > > > We have a 8-way P-III, 16GB RAM running 2.6.8-1. We use this as
    > > > our server to keep source code, cscopes and do the builds.
    > > > This machine seems to slow down over the time. One thing we
    > > > keep noticing is it keeps running out of lowmem. Most of
    > > > the lowmem is used for ext3 inode cache + dentry cache +
    > > > bufferheads + Buffers. So we did 2:2 split - but it improved
    > > > thing, but again run into same issues.
    > > >
    > > > So, why is these slab cache are not getting purged/shrinked even
    > > > under memory pressure ? (I have seen lowmem as low as 6MB). What
    > > > can I do to keep the machine healthy ?
    > >
    > > How does /proc/sys/fs/dentry-state look when you run low on lowmem ?
    >
    >
    >
    > badari@kernel:~$ cat /proc/sys/fs/dentry-state
    > 1434093 1348947 45 0 0 0
    > badari@kernel:~$ grep dentry /proc/slabinfo
    > dentry_cache 1434094 1857519 144 27 1 : tunables 120
    > 60 8 : slabdata 68797 68797 0

    Hmm.. so we are not shrinking dcache despite a large number of
    unsed dentries. That is where we need to look. Will dig a bit
    tomorrow.

    Thanks
    Dipankar
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