On Tue, 16 Oct 2007, Josh Carroll wrote:
Not to say that any problems that might have developed with SCHED_4BSD
should not be fixed, but you should give SCHED_ULE a try since it brings
benefits even for single CPU systems (e.g. better interactive response).
For my particular work load, 4BSD is actually faster than ULE in
RELENG_7. Specifically, on a Q6600 running ffmpeg -threads 8 to
transcode some H.264 video, 4BSD is about 5% faster. I took a sample
video and transcoded the first 120 seconds of it, and here are the
results (including a control from 6.2-RELEASE-p7/4BSD scheduler):
releng_6_2 (4BSD) 1:32.39
releng_7 (4BSD) 1:32.44
releng_7 (ULE) 1:37.15
This is obviously a different scenario from MySQL. So perhaps ULE
isn't as well tuned for cases like ffmpeg?
Hi Josh, thanks for the report. How many CPUs are in your system? Can
you give me the output of 'vmstat 5' over the course of one run on 4BSD
and ULE? Or just one of them if you can't spare the time.
Thanks,
Jeff
Josh
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