Solving the ext3 latency problem [LWN.net]

Solving the ext3 latency problem

Posted Apr 14, 2009 18:40 UTC (Tue) by mrshiny (guest, #4266)
Parent article: Solving the ext3 latency problem

I don't understand this:

There is one other important change needed to get a truly quick fsync() with ext3, though: the filesystem must be mounted in data=writeback mode.

Is this because the changes to fsync are disabled in data=ordered, or just because the performance gains are small compared to the overhead of data=ordered?

I'm curious because if fsync is slow application developers won't use it, even if on some systems it's fast. It will be years before application developers start using it "properly" again.

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