> I'm likely going to make this the default for PostgreSQL on FreeBSD > starting with 7.4 (just posted something to -hackers about this)f. If > you'd like to do this in your testing, just apply the following patch. > > Right now PostgreSQL defaults to 8K blocks, but FreeBSD uses 16K > blocks which means that currently, reading two blocks of data in PG is > two read calls to the OS, one reads 16K of data off disk and returns > the 1st page, the 2nd call pulls the 2nd block from the FS cache. In > making things 16K, it avoids the need for the 2nd system call which is > where the performance difference is coming from, afaikt. -sc
Are you _sure_ this won't cause any atomicity problems? Can FreeBSD write 16k as an atomic unit? Chris ---------------------------(end of broadcast)--------------------------- TIP 4: Don't 'kill -9' the postmaster
