On Mar 5, 2007, at 2:36 AM, Tom Lane wrote:
> n into account.
>
> I'm also less than convinced that it'd be helpful for a big seqscan:
> won't reading a new disk page into memory via DMA cause that memory to
> get flushed from the processor cache anyway?
Nope. DMA is writing directly into main memory. If the area was in
the L2/L1 cache, it will get invalidated. But if it isn't there, it
is okay.
--
Grzegorz Jaskiewicz
gj@pointblue.com.pl