/proc/meminfo behaviour...

Guys, is this normal?

# head -2 /proc/meminfo
        total:    used:    free:  shared: buffers:  cached:
Mem:  193830912 76816384 117014528        0   425984 72572928
                         ^^^^^^^^^
# sleep 1
# head -2 /proc/meminfo
        total:    used:    free:  shared: buffers:  cached:
Mem:  193830912 76869632 116961280        0   430080 72609792
                         ^^^^^^^^^
#

This is on a PC with no swap and no disk, booting off an initrd stored on a compact flash. I can understand that while sleep is running, the amount of free memory is reduced. Why does the number stay reduced even after it is done running? No matter how long you wait, the number never comes back up. Is the memory really gone or is there something I don't understand about /proc/meminfo? Or does this have something to do with the ramdisk? Thanks.

-Jarrett Redd