Ryzen public erratas

[Mike Tancsa]

On 6/13/2018 6:35 AM, Konstantin Belousov wrote:
> 
> Please report the results.  If the script helps, I will code the kernel
> change to apply the workarounds.

The hard lockups I was seeing on Ryzen and Epyc boxes are now gone with
the microcode and script below.

Not sure if its one or some combo of the settings, but all the steps
below have made my 2 test systems stable on RELENG_11 anyways.

This was on a Ryzen 5 1600X (ASUS PRIME X370-PRO BIOS from 04/19/2018)
CPU Microcode patch level: 0x8001137

And
EPYC 7281 16-Core (Supermicro H11SSL-i BIOS 04/27/2018 )
Microcode patch level: 0x8001227



Details of the issue were discussed at

https://lists.freebsd.org/pipermail/freebsd-virtualization/2018-March/006187.html
and
https://lists.freebsd.org/pipermail/freebsd-stable/2018-January/088174.html

TL;DR : Generating traffic via iperf3 between VMs either on bhyve or
VirtualBox would make the box lockup-- no crash, just a blank screen

	---Mike


> 
> #!/bin/sh
> 
> # Enable workarounds for erratas listed in
> # https://developer.amd.com/wp-content/resources/55449_1.12.pdf
> 
> # 1057, 1109
> sysctl machdep.idle_mwait=0
> sysctl machdep.idle=hlt
> 
> for x in /dev/cpuctl*; do
> 	# 1021
> 	cpucontrol -m '0xc0011029|=0x2000' $x
> 	# 1033
> 	cpucontrol -m '0xc0011020|=0x10' $x
> 	# 1049
> 	cpucontrol -m '0xc0011028|=0x10' $x
> 	# 1095
> 	cpucontrol -m '0xc0011020|=0x200000000000000' $x
> done
> 
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-- 
-------------------
Mike Tancsa, tel +1 519 651 3400 x203
Sentex Communications, mike at sentex.net
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Cambridge, Ontario Canada