linux-kernel - Re: [PATCH] perf/x86/amd: Do not WARN on every IRQ

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Date:   Thu, 14 Sep 2023 10:44:25 +0200
From:   Jirka Hladky <jhladky@...hat.com>
To:     Sandipan Das <sandipan.das@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Breno Leitao <leitao@...ian.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, leit@...com,
        dcostantino@...a.com,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-perf-users@...r.kernel.org>,
        "open list:PERFORMANCE EVENTS SUBSYSTEM" 
        <linux-kernel@...r.kernel.org>, ananth.narayan@....com,
        Ravi Bangoria <ravi.bangoria@....com>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH] perf/x86/amd: Do not WARN on every IRQ

Hi Sandipan,

here is the info from /proc/cpuinfo

vendor_id       : AuthenticAMD
cpu family      : 25
model           : 160
model name      : AMD EPYC 9754 128-Core Processor
stepping        : 2
microcode       : 0xaa0020f

>2. Microcode patch level
Is it the microcode string from cpuinfo provided above, or are you
looking for something else?

Thanks!
Jirka


On Wed, Sep 13, 2023 at 6:19 PM Sandipan Das <sandipan.das@....com> wrote:
>
> Hi Jirka,
>
> Can you please share the following?
>
> 1. Family, Model and Stepping of the processor
> 2. Microcode patch level
> On 9/13/2023 8:00 PM, Jirka Hladky wrote:
> > Hi Sandipan,
> >
> > Is there any update on this issue? We have hit the issue, and it makes
> > the server pretty unusable due to the thousands of Call Traces being
> > logged.
> >
> > Thanks a lot!
> > Jirka
> >
> >
> > On Fri, Jun 16, 2023 at 5:34 PM Peter Zijlstra <peterz@...radead.org> wrote:
> >>
> >> On Fri, Jun 16, 2023 at 08:13:22PM +0530, Sandipan Das (AMD) wrote:
> >>> The reserved bits should never be set. The purpose of the WARN_ON() is to catch such anomalies.
> >>> I am working out the details with Breno and will report back with a resolution.
> >>
> >> Thanks!
> >>
> >
> >
>


-- 
-Jirka