linux-kernel - Re: [perf report] 977f739b71: perf-test.skid_test.round2.MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_withou t_NMI_fixed

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Date:   Fri, 2 Oct 2020 16:20:20 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Michael Petlan <mpetlan@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Re: [perf report] 977f739b71:
 perf-test.skid_test.round2.MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_withou
 t_NMI_fixed_period.fail



On 9/30/2020 8:41 PM, Michael Petlan wrote:
> Hello. To me, it looks rather a random failure. Is it actually reproducible
> and proven that the patch has caused it? The patch doesn't seem to cause
> the fails below.

Hi Michael,

It's not always reproducible, but we can reproduce it in most cases:

39c0a53b114d0317 977f739b7126bf98b5202e243f6
---------------- ---------------------------
        fail:runs  %reproduction    fail:runs
            |             |             |
            :8           75%           6:8 
perf-test.skid_test.round2.MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_with_NMI.fail
            :8           88%           7:8 
perf-test.skid_test.round2.MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_without_NMI_fixed_period.fail
            :8           25%           2:8 
perf-test.skid_test.round2.MEM_LOAD_RETIRED.L2_HIT_dtlb_with_NMI.fail
            :8           62%           5:8 
perf-test.skid_test.round2.MEM_LOAD_RETIRED.L2_HIT_dtlb_without_NMI_fixed_period.fail

Best Regards,
Rong Chen


> Cheers,
> Michael
> 
> On Wed, 30 Sep 2020, kernel test robot wrote:
>> Greeting,
>>
>> FYI, we noticed the following commit (built with gcc-9):
>>
>> commit: 977f739b7126bf98b5202e243f60cbc0a1ec2c3b ("perf report: Disable ordered_events for raw dump")
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>>
>>
>> in testcase: perf-test
>> version: perf-test-x86_64-git-1_20200717
>> with following parameters:
>>
>> 	type: lkp
>> 	ucode: 0xd6
>>
>> test-description: The internal Perf Test suite.
>>
>>
>> on test machine: 4 threads Intel(R) Core(TM) i7-7567U CPU @ 3.50GHz with 32G memory
>>
>> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>>
>>
>>
>>
>> If you fix the issue, kindly add following tag
>> Reported-by: kernel test robot <rong.a.chen@...el.com>
>>
>>
>> 2020-09-28 17:02:40 ./skid_test/run.sh
>> Mon Sep 28 17:02:58 UTC 2020
>> 3 test cases pass for skid_test test. 3 test cases fail for skid_test test.
>> Test Case BR_INST_RETIRED.ALL_BRANCHES_PEBS_triad_loop_with_NMI PASS!
>> Test Case MEM_LOAD_RETIRED.L2_HIT_dtlb_with_NMI PASS!
>> Test Case MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_with_NMI FAILED!
>> Test Case BR_INST_RETIRED.ALL_BRANCHES_PEBS_triad_loop_without_NMI_fixed_period PASS!
>> Test Case MEM_LOAD_RETIRED.L2_HIT_dtlb_without_NMI_fixed_period FAILED!
>> Test Case MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_without_NMI_fixed_period FAILED!
>>
>>
>>
>> To reproduce:
>>
>>          git clone https://github.com/intel/lkp-tests.git
>>          cd lkp-tests
>>          bin/lkp install job.yaml  # job file is attached in this email
>>          bin/lkp run     job.yaml
>>
>>
>>
>> Thanks,
>> Rong Chen
>>
>>
>