To briefly summarize the previous post related to perf. degradation when
- kernel build running 1yr old kernel took 100minutes
- same kernel build running recent kernel 148minutes
(ie. Almost a 50% degradation.)
As noted in the last post, I got rid of most of the degradation by disabling
- same kernel build running recent kernel with SCHED_4BSD 104minutes
I have now found I can get rid of almost all of the degradation by building the
recent kernel with
The 1yr old kernel was built with SCHED_ULE, so the degradation is some change
to the kernel since Apr. 12, 2016 that affects SCHED_ULE but not SCHED_4BSD.
Since GENERIC uses SCHED_ULE, it would be nice to see good perf. with that
However, recommending "options SCHED_4BSD" is nicer than recommending disabling
ps: I tried the 1yr old net driver in the recent kernel and it had no effect on
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