This is the DS101 running a 2.6.16-rc2-git8 kernel:
Timing cached reads: 188 MB in 2.03 seconds = 92.53 MB/sec Timing buffered disk reads: 58 MB in 3.00 seconds = 19.32 MB/sec

IIRC, the 2.4.22-uc0 kernel did 22MB/sec buffered.