Increase sync write performance?

[Gionatan Danti <g.danti@xxxxxxxxxx>]

Hi list,
I am trying to understand if, and how, to increase synchronous write 
performance to an XFS filesystem.
A common scenario is an NFS-exported directory with sync writes enabled 
(default). With EXT4, it is possible to mount it using the 
"data=journal" option which, by eliminating small seeks, give a very 
nice performance boost (at least with short write spikes).
AFAIK, XFS only journals metadata, never user data alone. There is 
nothing I can do to increase its sync write performance in this case?
Short of using a powerloss-protected controller/drives with writeback 
caches enabled, of course...
Thanks.

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Danti Gionatan
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