scheduler tunables with contest - interactive_delta

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osdl hardware, contest benchmark, 2.5.52-mm2 varying the interactive delta:

I've cut it down to the two loads that seem to be affected significantly. The 
other changes are subtle. id1 is interactive_delta = 1 and so on:

io_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
id1 [5]                 78.2    108     9       19      2.16
id2 [5]                 87.9    96      12      19      2.43
id3 [5]                 79.4    105     10      18      2.19
id4 [5]                 84.9    109     12      22      2.34
id5 [7]                 99.8    94      18      24      2.76
id6 [5]                 103.3   104     18      25      2.85
id7 [5]                 104.1   89      17      22      2.87

mem_load:
Kernel [runs]           Time    CPU%    Loads   LCPU%   Ratio
id1 [3]                 78.0    100     34      2       2.15
id2 [5]                 94.3    84      35      2       2.60
id3 [5]                 92.6    85      32      2       2.56
id4 [5]                 65.8    134     39      3       1.82
id5 [5]                 63.0    143     38      3       1.74
id6 [5]                 69.7    129     38      2       1.92
id7 [5]                 90.6    87      32      2       2.50

Seems like io_load likes lower interactive deltas (lower the better?) and 
mem_load likes high interactive_deltas (sweet spot 5).

Con
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