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    SubjectRe: VM issue causing high CPU loads
    Yohan wrote:
    > Andrew Morton wrote:
    >> On Mon, 24 Aug 2009 16:23:22 +0200
    >> Yohan <kernel@yohan.staff.proxad.net> wrote:
    >>> Hi,
    >>>
    >>> Is someone have an idea for that :
    >>>
    >>> http://bugzilla.kernel.org/show_bug.cgi?id=14024
    >>>
    >> Please generate a kernel profile to work out where all the CPU tie is
    >> being spent. Documentation/basic_profiling.txt is a starting point.
    >>
    > I post some new reports, it seems that the problem is in
    > rpcauth_lookup_credcache ...
    >
    > for information, this is an imap mail server that mounts ~10 netapp
    > over ~300 mountpoints..
    I saw that : http://patchwork.kernel.org/patch/24747/

    I did only:

    --- linux-2.6.27.21/include/linux/sunrpc/auth.h 2009-03-23 23:04:09.000000000 +0100
    +++ linux-2.6.27.21/include/linux/sunrpc/auth.h 2009-05-19 16:02:35.000000000 +0200
    @@ -62,8 +62,12 @@
    */
    - #define RPC_CREDCACHE_HASHBITS 4
    + #define RPC_CREDCACHE_HASHBITS 12


    And i test it in prod since sunday: i only have 36% of one core used by
    system
    versus more than 3 cores used by system in another server that did a
    drop_caches at morning...

    Yohan


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