Mary Edie Meredith [off-list ref] wrote:

quoted

36% regression due to the CPU scheduler changes?  ow.

 > 
 > And that machine is a PIII, so presumably the setting of CONFIG_SCHED_SMT
 > makes no difference.
 > 
 > >From a quick look at the material you have there it appears that this
 > workload also is very I/O bound.  It's a little surprising that the CPU
 > scheduler could make so much difference.
 I'm not sure why you think this is IO bound. For 
 the throughput phase of the test (from which the 
 metric above is taken) there is very little physical 
 IO except at the start when the updates occur.  They
 finish in a few minutes, after which there is very
 little.

 http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat_io.png
 http://khack.osdl.org/stp/290304/results/plot/thuput.vmstat.txt

There seems to be a large amount of idle time in the profiles and in the
vmstat trace.

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