I'm using IBM ds400 fc disk system. Filesystem io options set to "async",
ext3. listener.log looks fine.

> From my point of view, you use data files on filesystem and/or software
> raid. And application create new sessions very often.
> If you use software raid, this cpu utilization are normal :) espesially
> if you use raid 5
>
> Else, please try to setup filesystem io options to DIRECTIO, mount
> filesystem with noattime.
> If you filesystem does not support direct io, please think about
> ASM/raw/ocfs
>
> btw, did you check listener.log?



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