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On Wed, 2012-07-25 at 10:35 -0300, Paulo Ricardo Motta Gomes wrote:
> I've been running into similar problems too, in a setup with lots of small
> files. Does anyone knows how big is the XFS inode and directory caches?

The are only limited by memory size.  You can
tune /proc/sys/vm/vfs_cache_pressure to tune how they are reclaimed
relatively to the file data cache.