> Well, we're already not waiting for fsync, which is the slowest part.
> If there's a performance problem, it may be because FADVISE_DONTNEED
> disables kernel buffering so that we're forced to actually read the data
> back from disk before sending it on down the wire.
Well, that's fairly direct to solve, no? Just disable FADVISE_DONTNEED
if walsenders > 0.
-- -- Josh Berkus PostgreSQL Experts Inc.
http://www.pgexperts.com