linux-kernel - Re: [perf metricgroup] fcc9c5243c: perf-sanity-tests.Parse_and_process

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Message-ID: <0b84ddc4-ddba-34c2-0996-0d83c7008a6f@linux.intel.com>
Date:   Mon, 19 Oct 2020 16:02:57 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Andi Kleen <ak@...ux.intel.com>, Ian Rogers <irogers@...gle.com>
Cc:     kernel test robot <rong.a.chen@...el.com>,
        John Garry <john.garry@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linuxarm@...wei.com, LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Joakim Zhang <qiangqing.zhang@....com>,
        zhangshaokun@...ilicon.com, James Clark <james.clark@....com>,
        linux-imx@....com, 0day robot <lkp@...el.com>, lkp@...ts.01.org
Subject: Re: [perf metricgroup] fcc9c5243c:
 perf-sanity-tests.Parse_and_process_metrics.fail



On 10/19/2020 9:52 AM, Andi Kleen wrote:
>> I believe this is a Skylake and there is a known bug in the Skylake
>> metric DRAM_Parallel_Reads as described here:
>> https://lore.kernel.org/lkml/CAP-5=fXejVaQa9qfW66cY77qB962+jbe8tT5bsLoOOcFmODnWQ@mail.gmail.com/
>> Fixing the bug needs more knowledge than what is available in manuals.
>> Hopefully Intel can take a look.
> 
> Oh I missed the original mail for some reason.  Yes it should be cmask instead of thresh
> for client.  I think thresh is used on the server uncore only, not on the client.
> 
> Jin Yao, can you send a patch please?
> 
> -Andi
> 

Yes, the DRAM_Parallel_Reads works on server but it's failed on client.

I will post a patch to fix that.

Thanks
Jin Yao