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Date:      Tue, 24 Apr 2018 17:04:26 -0700 (PDT)
From:      Don Lewis <truckman@FreeBSD.org>
To:        Mike Tancsa <mike@sentex.net>
Cc:        Pete French <petefrench@ingresso.co.uk>, nimrodl@gmail.com, eric@vangyzen.net, freebsd-stable@freebsd.org, freebsd@hda3.com, avg@freebsd.org
Subject:   Re: Ryzen issues on FreeBSD ? (with sort of workaround)
Message-ID:  <tkrat.5235cb463511b830@FreeBSD.org>
In-Reply-To: <e41b6aa4-7ac1-44b4-8b88-fd744e31f7e2@sentex.net>
References:  <E1fAaRY-0000nB-Ut@dilbert.ingresso.co.uk> <59b435cf-f4fb-0cc8-3bd0-0765ac0592da@sentex.net> <84898b9f-991c-420a-3ebd-f8c4ad9915e1@ingresso.co.uk> <e41b6aa4-7ac1-44b4-8b88-fd744e31f7e2@sentex.net>

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On 24 Apr, Mike Tancsa wrote:
> On 4/24/2018 10:01 AM, Pete French wrote:
>> 
>> Well, I ranh the iperf tests between real machine for 24 hours and that
>> worked fine. I also then spun up a Virtualbox with Win10 in it, and ran
>> iuperf to there at the same time as doing it betwene real machines, and
>> also did a full virus scan to exercise the disc. the idea being to
>> replicate Mondays lockup.
> 
> I was able to lock it up with vbox. bhyve was just a little easier to
> script and also I figured would be good to get VBox out of the mix in
> case it was something specific to VBox.  I dont recall if I tried it
> with SMT disabled.  Regardless, on Intel based systems I ran these tests
> for 72hrs straight without issue.   I can sort of believe hardware issue
> or flaky motherboard BIOSes (2 ASUS MBs, 1 MSI MB, 3 Ryzen chips), but
> the fact that two server class MBs from SuperMicro along with an Epyc
> chip also does the same thing makes me think something specific to
> FreeBSD and this class of AMD CPU :(

It would be interesting to test other AMD CPUs.  I think AMD and Intel
have some differences in the virtualization implementations.




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