Date: Tue, 19 Jun 2018 11:50:30 +0200 From: Gary Jennejohn <gljennjohn@gmail.com> To: Eitan Adler <lists@eitanadler.com> Cc: Konstantin Belousov <kostikbel@gmail.com>, amd64@freebsd.org, "current@freebsd.org" <current@freebsd.org> Subject: Re: Ryzen public erratas Message-ID: <20180619115030.5491af33@ernst.home> In-Reply-To: <CAF6rxgksYSS1g_jRoGiENBXY9pNW3NUmkJ9qKJ1k%2BYw08iaVMw@mail.gmail.com> References: <20180613103535.GP2493@kib.kiev.ua> <CAF6rxg=ua-WneapcVF3UWaRT79P=fO9fVGwYsntVmJrx3rTJKA@mail.gmail.com> <CAF6rxgksYSS1g_jRoGiENBXY9pNW3NUmkJ9qKJ1k%2BYw08iaVMw@mail.gmail.com>
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On Mon, 18 Jun 2018 22:44:13 -0700 Eitan Adler <lists@eitanadler.com> wrote: > On 13 June 2018 at 04:16, Eitan Adler <lists@eitanadler.com> wrote: > > 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 ? > > This might explain why I've never seen the lockup issues mentioned by > other people. What would cause my machine to differ from others? > I had sysctl machdep.idle_mwait=1 and machdep.idle=acpi before applying the shell script. I had multiple lockups every week, sometimes multiple lockups per day. With the idle settings from the script it still locks up, but not as often. I suspect I also need to update the CPU firmware, although I expect that the new BIOS version I installed last week would have done that already. -- Gary Jennejohn
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