All test performed on tmpfs, /tmp/a mounted on /tmp/b.
UNTAR: tar xfz ../linux-3.0.tar.gz
LS: ls -lR > /dev/null
RM: rm -rf linux-3.0
VERSION UNTAR LS RM
v0.4 48 1.5 5
v0.5-rc1 56 7 19
v0.5-rc1-1 54 4.1 9
v0.5-rc1-2 45 1.7 3.4