To check the current amount of swap
===================================

swap -l

lswap path         dev    pri swaplo   blocks     free  maxswap    vswap
    1 /dev/swap
                   0,83     0      0   262144   260536   262144        0



To create more swap (as root)
=============================

To create a swap file:
  mkdir /var/swap
  cd /var/swap

  dd if=/dev/zero of=swap1 bs=1024k count=1024


add the following to /etc/fstab:
  /var/swap/swap1 swap swap pri=2 2 2

add the swap 
  swap -m


Check teh swap again:
  swap -l


lswap path         dev    pri swaplo   blocks     free  maxswap    vswap
    2 /var/swap/swap1
                   0,86     2      0  2097152  2097152  2097152        0
    1 /dev/swap
                   0,83     0      0   262144   260536   262144        0