How do the values in /proc/sys/vm/pagecache affect cache settings in Red Hat Enterprise Linux 3?

Within /proc/sys/vm/pagecache you will see three numbers. On previous versions of Red Hat Enterprise Linux. The first number is the minimum percentage of memory to use as disk cache, the second number is the percentage of memory to attempt to use initially, and the third number is the maximum percentage of memory to use.

To view your default settings you can use the c...