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SubjectRegression seen for patch "sched:dont decrease idle sleep avg"

As a result of the patch "sched:dont decrease idle sleep avg"
introduced after 2.6.15, there is a 4% drop in Volanomark
throughput on our Itanium test machine.
Probably the following happened:
Compared to previous code, this patch slightly increases
the the priority boost when a job is woken up.
This adds priority spread and variations to the wait time of jobs
on run queue if we have a lot of similar jobs in the system.

See patch:


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