tbench regression on each kernel release from 2.6.22 -> 2.6.28

[Christoph Lameter]

It seems that the network stack becomes slower over time? Here is a list of
tbench results with various kernel versions:

2.6.22		3207.77 mb/sec
2.6.24		3185.66
2.6.25		2848.83
2.6.26		2706.09
2.6.27(rc2)	2571.03

And linux-next is:

2.6.28(l-next)	2568.74

It shows that there is still have work to be done on linux-next. Too close to
upstream in performance.

Note the KT event between 2.6.24 and 2.6.25. Why is that?
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