I've seen very big differences with huge_pages set to on, especially in
context of CPU usage on multiple socket servers.
You could play as well with storage options, for instance inode size and
check if there is any advantage for your db from inlining, which is
supported by xfs. You can find more informations here:
http://beegfs.com/wiki/StorageServerTuning
An interesting option for WAL would be to add the mount option- allocsize -
and set it to 16MB - so the exact size of WAL segment to reduce the risk of
fragmentation and optimal streaming write throughput.
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