4:20 p.m.
On Mon, Oct 19, 2020 at 2:51 AM John Garry <john.garry(a)huawei.com> wrote:
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.
Thanks for taking a look John. If you want help you can send the
output of "perf test 67 -vvv" to me. It is possible Broadwell has
similar glitches in the json to Skylake. I tested the original test on
server parts as I can access them as cloud machines.
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.
I still have these changes to look at in my inbox but I'm assuming
they're good :-) Sorry for not getting to them, but it's good they are
merged.
Thanks,
Ian
> 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
> >>
> > .
> >
>