Help diagnose my Ryzen build problem
karu.pruun
karu.pruun at gmail.com
Mon Aug 27 13:17:00 UTC 2018
On Mon, Aug 27, 2018 at 3:21 PM Meowthink <meowthink at gmail.com> wrote:
> That's kib, who has committed things in that script to both 12 [1] and
> stable/11 [2].
>
> Unfortunately, that's for Ryzens family 17h model 00h-0fh, whereas my
> Ryzen 5 2400G's model is 11h.
>
> On the microcode. It shall be updated through UEFI/BIOS updates. I
> think mine is now PinnaclePI-AM4_1.0.0.4 with microcode patchlevel
> 0x810100b.
>
> Seems like ... the only thing I can do is sit down and wait?
The revision
https://svnweb.freebsd.org/base/head/sys/x86/x86/cpu_machdep.c?r1=336763&r2=336762&pathrev=336763
works around the mwait issue, i.e. it sets
sysctl machdep.idle_mwait=0
sysctl machdep.idle=hlt
Now it may or may not relate to your problem, but it appears that
Ryzen 2400G also has another issue with HLT, see the DragonFly bug
report
https://bugs.dragonflybsd.org/issues/3131
which AMD is aware of and is possibly working on, but it may not have
appeared in the errata yet. The bug report says that until this is
fixed, the workaround is to also disable HLT in cpu_idle. I am not
sure what is the correct value for the sysctl on FreeBSD, perhaps
sysctl machdep.idle=0
or some other value?
Cheers
Peeter
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