On Wed, 13 Jun 2018 14:46:25 +0300 Konstantin Belousov <kostik...@gmail.com> wrote:
> On Wed, Jun 13, 2018 at 12:06:42PM +0100, Johannes Lundberg wrote: > > > > Konstantin Belousov writes: > > > > > 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 > > > > > > > Hi > > > > Thanks for the fix! I'm trying it now on my Ryzen 3 2200G which does > > experience some random occasional resets. > > > > About updating to latest firmware, is this something that's done from BIOS > > or > > from FreeBSD? If the latter, how? > From FreeBSD, install sysutils/devcpu-data then do > service microcode_update start > and of course, you must flash latest BIOS. > > The microcode_update must be applied before running this script. > I added before and after outputs to my version of the script and saw that my BIOS is setting all the relevant bits at start up. So, a BIOS update might help. -- Gary Jennejohn _______________________________________________ firstname.lastname@example.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-amd64 To unsubscribe, send any mail to "freebsd-amd64-unsubscr...@freebsd.org"