sysadm@spamwall:~$ cat /boot/config-2.6.15-27-server |grep -i mem
CONFIG_SHMEM=y
# CONFIG_TINY_SHMEM is not set
# CONFIG_NOHIGHMEM is not set
# CONFIG_HIGHMEM4G is not set
CONFIG_HIGHMEM64G=y
CONFIG_HIGHMEM=y
CONFIG_SELECT_MEMORY_MODEL=y
CONFIG_FLATMEM_MANUAL=y
# CONFIG_DISCONTIGMEM_MANUAL is not set
# CONFIG_SPARSEMEM_MANUAL is not set
CONFIG_FLATMEM=y
CONFIG_FLAT_NODE_MEM_MAP=y
# CONFIG_SPARSEMEM_STATIC is not set
CONFIG_PCMCIA_PROBE_MEM=y
# Memory Technology Devices (MTD)
CONFIG_BLK_DEV_UMEM=m
# CONFIG_MISDN_MEMDEBUG is not set
CONFIG_W1_SMEM=m
# CONFIG_DEBUG_HIGHMEM is not set
sysadm@spamwall:~$