Ryzen issues on FreeBSD ? (summary of 4 issues)

[Nimrod Levy]

I'm not sure this is characterized quite right.  I've been seeing c) where
the system freezes completely and seems to be related to idle/ low load,
but the workaround that seems to be working around the issue is part of a)
where I lowered the memory speed.


On Wed, Jan 24, 2018 at 9:42 AM Mike Tancsa <mike at sentex.net> wrote:

> I think perhaps a good time to summarize as a few issues seem to be going
> on
>
> a) fragile BIOS settings. There seems to be a number of issues around
> RAM speeds and disabled C-STATES that impact stability.  Specifically,
> lowering the default frequency from 2400 to 2133 seems to help some
> users with crashes / lockups under heavy loads.
>
> b) CPUs manufactured prior to week 25 (some say week 33?) have a
> hardware defect that manifests itself as segfaults in heavy compiles.  I
> was able to confirm this on 1 of the CPUs I had using a Linux setup. It
> seems to confirm this, you need to physically look at the CPU for the
> manufacturing date :( Not sure how to trigger it on FreeBSD reliably,
> but there is a github project I used to verify on Linux
> (https://github.com/suaefar/ryzen-test)
>
> c) The idle lockup bug.  This *seems* to be confirmed on Linux as well
> http://blog.programster.org/ubuntu-16-04-compile-custom-kernel-for-ryzen
> and
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1690085
>
> d) Compile failures of some ports.  For myself and one other user,
> compiling net/samba47 reliably hangs in roughly the same place.  Its not
> clear if this is related to any of the above bugs or not.
>
> Right now I have RMA'd my 3 CPUs back to AMD. Hopefully, I will get
> replacements in a week and can get back to testing c) and d).
>
>         ---Mike
>
> --

--
Nimrod