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

Tim Chen
2006-05-08T23:54:36Z

Con,

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:
http://www.kernel.org/git/?
p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e72ff0bb2c163eb13014ba113701bd42dab382fe

Regards,
Tim