Re: [PATCH] Revert default wal_sync_method to fdatasync on Linux 2.6.33+

Marti Raudsepp <marti@juffo.org> writes:
> PostgreSQL's default settings change when built with Linux kernel
> headers 2.6.33 or newer. As discussed on the pgsql-performance list,
> this causes a significant performance regression:
> http://archives.postgresql.org/pgsql-performance/2010-10/msg00602.php

> NB! I am not proposing to change the default -- to the contrary --
> this patch restores old behavior.

I'm less than convinced this is the right approach ...

If open_dsync is so bad for performance on Linux, maybe it's bad
everywhere?  Should we be rethinking the default preference order?
        regards, tom lane