9:48 a.m.
On 19/10/2020 00:30, Ian Rogers wrote:
On Sun, Oct 18, 2020 at 1:51 AM kernel test robot
<rong.a.chen(a)intel.com> wrote:
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: fcc9c5243c478f104014daf4d23db86098d2aef0 ("perf metricgroup: Hack a fix
for aliases when covering multiple PMUs")
> url:
https://github.com/0day-ci/linux/commits/John-Garry/perf-pmu-events-Suppo...
>
>
> in testcase: perf-sanity-tests
> version: perf-x86_64-c85fb28b6f99-1_20201008
> with following parameters:
>
> perf_compiler: gcc
> ucode: 0xdc
>
>
>
> on test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz with 32G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
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+jbe8tT5bsLoOOc...
Fixing the bug needs more knowledge than what is available in manuals.
Hopefully Intel can take a look.
Thanks,
Ian
So this named patch ("perf metricgroup: Hack a fix for aliases...") is
breaking test #67 on my machine also, which is a broadwell.
I will have a look, but I was hoping that Ian would have a proper fix
for this on top of ("perf metricgroup: Fix uncore metric expressions"),
which now looks to be merged.
Thanks!
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen(a)intel.com>
>
>
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 67
> 67: Parse and process metrics : FAILED!
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 68
> 68: x86 rdpmc : Ok
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 69
> 69: Convert perf time to TSC : Ok
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 70
> 70: DWARF unwind : Ok
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 71
> 71: x86 instruction decoder - new instructions : Ok
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 72
> 72: Intel PT packet decoder : Ok
> 2020-10-16 19:31:52 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 73
> 73: x86 bp modify : Ok
> 2020-10-16 19:31:53 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 74
> 74: probe libc's inet_pton & backtrace it with ping : Ok
> 2020-10-16 19:31:54 sudo
/usr/src/perf_selftests-x86_64-rhel-8.3-fcc9c5243c478f104014daf4d23db86098d2aef0/tools/perf/perf
test 75
> 75: Zstd perf.data compression/decompression : Ok
>
>
>
> 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
>
.