Pentium 100
Linux 2 kernel
gcc 2.7.0 -O3 -fomit-frame-pointer
No X server running, just a console, it makes the top speed jump from 151,000
to 158,000 :-).
options    des ecb/s
assember   281000.00 177.1%
16 r1 p    158667.40 100.0%
16 r1 i    148471.70  93.6%
16 r2 p    143961.80  90.7%
16 r2 i    141689.20  89.3%
 4 r1 i    140100.00  88.3%
 4 r2 i    134049.40  84.5%
16  c i    124145.20  78.2%
16  c p    121584.20  76.6%
 4  c i    118116.00  74.4%
 4 r2 p    117977.90  74.4%
 4  c p    114971.40  72.5%
 4 r1 p    114578.40  72.2%
-DDES_UNROLL -DDES_RISC1 -DDES_PTR