On Fri, Dec 4, 2009 at 1:40 PM, B. Todd Burruss <bburruss@real.com> wrote:
i've actually allocatted plenty of RAM, but it isn't fully used.  the
read performance dwindles well before reaching a RAM limit.

You don't want to over-allocate memory to Cassandra, you want to leave as much free as you can so the OS can cache the reads for you.