[Bug 221029] AMD Ryzen: strange compilation failures using poudriere or plain buildkernel/buildworld

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221029

--- Comment #95 from Mark Millard <markmi at dsl-only.net> ---
I've now tried Hyper-V instead of VirtualBox
for building lang/ghc (the most systematic
usually-quick-failure test that I've found).

In this context:

sysctl kern.sched.balance=1
sysctl kern.sched.steal_idle=0

did not seem to help. Nor did:

sysctl kern.sched.balance=0
sysctl kern.sched.steal_idle=0

Hyper-V did not report going beyond
8 virtual processors as a problem,
VirtualBox did.

So for Hyper-V I assigned 14 Virtual
Processors, leaving by count enough for
one core (2 threads) for Windows 10 Pro.
While for VirtualBox I used 8 per its
report when a larger figure is set.

Note: I had to avoid using a M.2 NVME
SSD and instead used a SATA SSD for Hyper-V.
For NVME the attempt to create the virtual
machine crashes Windows 10 Pro. It created
the virtual machine just fine when told to
use the SATA SSD.

Note: When Hyper-V is enabled, VirtualBox
64-bit is blocked --even if every Hyper-V
virtual machine is off. I had to disable
Hyper-V to get VirtualBox working again.
[There were more issues than I've noted here
as well.]

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