On 11/16/20 6:48 PM, kernel test robot wrote:
Greeting,
FYI, we noticed a -45.0% regression of phoronix-test-suite.npb.FT.A.total_mop_s
due to commit:
That's a huge slowdown...
commit: 47e29d32afba11b13efb51f03154a8cf22fb4360 ("mm/gup:
page->hpage_pinned_refcount: exact pin counts for huge pages")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
...but that commit happened in April, 2020. Surely if this were a serious issue
we
would have some other indication...is this worth following up on?? I'm inclined
to
ignore it, honestly.
thanks,
--
John Hubbard
NVIDIA
in testcase: phoronix-test-suite
on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 192G
memory
with following parameters:
test: npb-1.3.1
option_a: FT.A
cpufreq_governor: performance
ucode: 0x5002f01
test-description: The Phoronix Test Suite is the most comprehensive testing and
benchmarking platform available that provides an extensible framework for which
new tests can be easily added.
test-url: http://www.phoronix-test-suite.com/
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.s...@intel.com>
Details are as below:
-------------------------------------------------------------------------------------------------->
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
=========================================================================================
compiler/cpufreq_governor/kconfig/option_a/rootfs/tbox_group/test/testcase/ucode:
gcc-9/performance/x86_64-rhel-8.3/FT.A/debian-x86_64-phoronix/lkp-csl-2sp8/npb-1.3.1/phoronix-test-suite/0x5002f01
commit:
3faa52c03f ("mm/gup: track FOLL_PIN pages")
47e29d32af ("mm/gup: page->hpage_pinned_refcount: exact pin counts for huge
pages")
3faa52c03f440d1b 47e29d32afba11b13efb51f0315
---------------- ---------------------------
fail:runs %reproduction fail:runs
| | |
1:4 -25% :4
kmsg.Spurious_LAPIC_timer_interrupt_on_cpu
%stddev %change %stddev
\ | \
4585 ± 2% -45.0% 2522
phoronix-test-suite.npb.FT.A.total_mop_s
1223 ± 4% +40.2% 1714
phoronix-test-suite.time.percent_of_cpu_this_job_got
phoronix-test-suite.npb.FT.A.total_mop_s
6500 +--------------------------------------------------------------------+
| .+. .+. .+. |
6000 |.+ +.+.+.++.+.+.+.+.+.+.+ +.+.++ +.+.+.+.+.+.+.+.+.++.+ |
5500 |-+ : |
| : |
5000 |-+ : |
4500 |-+ +.+.+.|
| |
4000 |-+ |
3500 |-+ |
| |
3000 |-+ |
2500 |-+ O O O |
| O O O O O OO O O O O O O O O O O |
2000 +--------------------------------------------------------------------+
[*] bisect-good sample
[O] bisect-bad sample
Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.
Thanks,
Oliver Sang
