[CentOS] How much SWAP Space.

Hi,

I have loaded CentOS 5.6 on HP DL 180G6 2U Rack Server and the
physical RAM is 32 GB. As per
http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-swapspace.html
It says it should be 1 x of Physical RAM or less. Not sure about the
"less" word in deciding swap space size

Please suggest/guide further on what all parameters i should decide to
set swap space.

Regards,

Kaushal