Re: [perf report] 977f739b71: perf-test.skid_test.round2.MEM_LOAD_L3_MISS_RETIRED.LOCAL_DRAM_dtlb_withou t_NMI_fixed_period.fail

[Chen, Rong A]

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@xxxxxxxxx>
> >
> >
> > 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