ITAGAKI Takahiro wrote:
> The patch adds a new choice "open_direct" to wal_sync_method.
> It uses O_DIRECT flags for WAL writes, like O_SYNC.

Have you looked at what the performance difference of this option is?
For example, these benchmark results seem to indicate that an older
version of the patch is not a performance win, at least for OSDL's workload:

http://www.mail-archive.com/pgsql-pa.../msg07186.html

Is this data still applicable to the revised patch?

-Neil

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