Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?

I wrote:
> The fsync is associated with the write, which is not done with insert
> lock held.  We're not quite that dumb.

But wait --- are you thinking of the call path where a write (and
possible fsync) is forced during AdvanceXLInsertBuffer because there's
no WAL buffer space left?  If so, that's *exactly* the scenario that
can be expected to be less common with more buffer space.

            regards, tom lane