AMD64, 64bit mode
512kb default options

==1098==
==1098== I   refs:      48,428,597,343
==1098== I1  misses:           437,461
==1098== L2i misses:            13,202
==1098== I1  miss rate:           0.00%
==1098== L2i miss rate:           0.00%
==1098== 
==1098== D   refs:      23,278,015,777  (14,127,004,084 rd + 9,151,011,693 wr)
==1098== D1  misses:     1,910,944,896  ( 1,811,568,325 rd +    99,376,571 wr)
==1098== L2d misses:     1,310,003,348  ( 1,242,056,170 rd +    67,947,178 wr)
==1098== D1  miss rate:            1.2% (           0.2%   +           2.1%  )
==1098== L2d miss rate:            1.0% (           3.0%   +           4.6%  )
==1098== 
==1098== L2 refs:        1,911,382,357  ( 1,812,005,786 rd +    99,376,571 wr)
==1098== L2 misses:      1,310,016,550  ( 1,242,069,372 rd +    67,947,178 wr)
==1098== L2 miss rate:             0.0% (           1.0%   +           4.6%  )


with:  --l2=2097152,8,64
==3694== 
==3694== I   refs:      48,428,597,343
==3694== I1  misses:           437,461
==3694== L2i misses:            10,207
==3694== I1  miss rate:           0.00%
==3694== L2i miss rate:           0.00%
==3694== 
==3694== D   refs:      23,278,015,777  (14,127,004,084 rd + 9,151,011,693 wr)
==3694== D1  misses:     1,910,944,896  ( 1,811,568,325 rd +    99,376,571 wr)
==3694== L2d misses:       478,181,599  (   442,664,166 rd +    35,517,433 wr)
==3694== D1  miss rate:            1.2% (           0.2%   +           2.1%  )
==3694== L2d miss rate:            0.0% (           1.0%   +           6.2%  )
==3694== 
==3694== L2 refs:        1,911,382,357  ( 1,812,005,786 rd +    99,376,571 wr)
==3694== L2 misses:        478,191,806  (   442,674,373 rd +    35,517,433 wr)
==3694== L2 miss rate:             0.0% (           0.0%   +           6.2%  )



Pentium M, so 32bit mode and 2 MB L2:

==23833== I   refs:      59,900,106,384
==23833== I1  misses:         6,048,944
==23833== L2i misses:           308,094
==23833== I1  miss rate:           0.01%
==23833== L2i miss rate:           0.00%
==23833== 
==23833== D   refs:      39,040,984,946  (23,947,858,812 rd + 15,093,126,134 wr)
==23833== D1  misses:     1,656,220,653  ( 1,583,288,407 rd +     72,932,246 wr)
==23833== L2d misses:       262,415,617  (   243,350,693 rd +     19,064,924 wr)
==23833== D1  miss rate:            4.2% (           6.6%   +            0.4%  )
==23833== L2d miss rate:            0.6% (           1.0%   +            0.1%  )
==23833== 
==23833== L2 refs:        1,662,269,597  ( 1,589,337,351 rd +     72,932,246 wr)
==23833== L2 misses:        262,723,711  (   243,658,787 rd +     19,064,924 wr)
==23833== L2 miss rate:             0.2% (           0.2%   +            0.1%  )