Tim Chen wrote:
Ingo,
Volanomark slows by 80% with CFS scheduler on 2.6.23-rc1.
Benchmark was run on a 2 socket Core2 machine.
The change in scheduler treatment of sched_yield
could play a part in changing Volanomark behavior.
In CFS, sched_yield is implemented
by dequeueing and requeueing a process . The time a process
has spent running probably reduced the the cpu time due it
by only a bit. The process could get re-queued pretty close
to head of the queue, and may get scheduled again pretty
quickly if there is still a lot of cpu time due.
I wonder if this explains the 30% drop in top performance
seen with the MySQL sysbench benchmark when the scheduler
changed to CFS...
See http://people.freebsd.org/~jeff/sysbench.png
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