I have a small patch to the ULE scheduler that makes a fairly large change
to the way timeshare threads are handled.
http://people.freebsd.org/~jeff/schedslice.diff
Previously ULE used a fixed slice size for all timeshare threads. Now it
scales the slice size down based on load. This should reduce latency for
timeshare threads as load increases. It is important to note that this
does not impact interactive threads. But when a thread transitions to
interactive from timeshare it should see some improvement. This happens
when something like Xorg chews up a lot of CPU.
If anyone has perf tests they'd like to run please report back. I have
done a handful of validation.
Thanks,
Jeff
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