Date: Wed, 13 Jun 2018 13:35:35 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: current@freebsd.org, amd64@freebsd.org Subject: Ryzen public erratas Message-ID: <20180613103535.GP2493@kib.kiev.ua>
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Today I noted that AMD published the public errata document for Ryzens, https://developer.amd.com/wp-content/resources/55449_1.12.pdf Some of the issues listed there looks quite relevant to the potential hangs that some people still experience with the machines. I wrote a script which should apply the recommended workarounds to the erratas that I find interesting. To run it, kldload cpuctl, then apply the latest firmware update to your CPU, then run the following shell script. Comments indicate the errata number for the workarounds. Please report the results. If the script helps, I will code the kernel change to apply the workarounds. #!/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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