Re: We really ought to do something about O_DIRECT and data=journalled on ext4

> However, this doesn't really address the question of what a sensible
> choice of default is.  If there's little evidence about whether the
> current flavor of open_datasync is really the fastest way, there's
> none whatsoever that establishes open_datasync_without_o_direct
> being a sane choice of default.

No, I'd switch to fdatasync.  That's the performance that most people
are familiar with anyway, since it was all Linux supported before.

-- 
                                  -- Josh Berkus
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