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Subject: [Bug 221029] AMD Ryzen: strange compilation failures using poudriere
 or plain buildkernel/buildworld
Date: Tue, 22 Aug 2017 05:56:49 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221029

--- Comment #89 from Don Lewis <truckman@FreeBSD.org> ---
In my latest experiment, I hacked the sched_ule steal_idle code to only all=
ow
threads to be stolen from the other SMT thread on the same core and set
steal_idle=3D1.  CPU idle time was greatly reduced, but ghc failed with SIG=
BUS
and chromium failed with the rename problem.

I don't necessarily count this as a failure since the first time I tried
steal_idle=3D0, balance=3D0, and affinity=3D1000 I got the same two failure=
s.  The
rename problems just seem to be really rare.  The ghc failures definitely
seemed to improve with steal_idle=3D0, but this experiment only provides on=
e data
point.

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