On 12/13/2011 7:01 PM, mdf_at_freebsd.org wrote: > > Has anyone experiencing problems tried to set sysctl kern.sched.steal_thresh=1 ? > > I don't remember what our specific problem at $WORK was, perhaps it > was just interrupt threads not getting serviced fast enough, but we've > hard-coded this to 1 and removed the code that sets it in > sched_initticks(). The same effect should be had by setting the > sysctl after a box is up. FWIW, this does impact the performance of pbzip2 on an i7. Using a 1.1G file pbzip2 -v -c big > /dev/null with burnP6 running in the background, sysctl kern.sched.steal_thresh=1 vs sysctl kern.sched.steal_thresh=3 N Min Max Median Avg Stddev x 10 38.005022 38.42238 38.194648 38.165052 0.15546188 + 9 38.695417 40.595544 39.392127 39.435384 0.59814114 Difference at 95.0% confidence 1.27033 +/- 0.412636 3.32852% +/- 1.08119% (Student's t, pooled s = 0.425627) a value of 1 is *slightly* faster. -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike_at_sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/Received on Wed Dec 14 2011 - 15:59:53 UTC
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