Date: Wed, 13 Jun 2018 04:16:55 -0700 From: Eitan Adler <lists@eitanadler.com> To: Konstantin Belousov <kostikbel@gmail.com> Cc: "current@freebsd.org" <current@freebsd.org>, amd64@freebsd.org Subject: Re: Ryzen public erratas Message-ID: <CAF6rxg=ua-WneapcVF3UWaRT79P=fO9fVGwYsntVmJrx3rTJKA@mail.gmail.com> In-Reply-To: <20180613103535.GP2493@kib.kiev.ua> References: <20180613103535.GP2493@kib.kiev.ua>
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On 13 June 2018 at 03:35, Konstantin Belousov <kostikbel@gmail.com> wrote: > 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 Is this needed if it was previously machdep.idle: acpi ? -- Eitan Adler
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