r4 v. ext3, quick speed vs. cpu experiments

[Grant Miner]

"mozilla-1.5a.tar" is mozilla 1.5alpha source tar, uncompressed. 
Partition mkfs.ext3 or mkfs.reiser4 --keys=SHORT is run before each run. 
Linux is 2.6.0-test2.

untar mozilla-1.5a.tar (file is on a reiser3 partition):
ext3: 17.64s 28% cpu
reiser4: 10.79s 67% cpu
sum: reiser4 0.61x time, 2.39x cpu
cp -a mozilla-src mozilla-src-copy, same partition:
ext3: 0:56.35sec 11% cpu
reiser4: 0:16.50 55% cpu
sum: reiser4 0.29x time, 5x cpu
tar c mozilla-src > mozilla.tar, same partition:
ext3: 0:36.47sec 10%cpu
reiser4: 0:16.90sec 25%cpu
sum: reiser4 0.46x time, 2.5x cpu
i'm impressed!