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Date: Tue, 25 Oct 2016 14:40:13 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Jiri Olsa <jolsa@...hat.com>
Cc: Michael Neuling <mikey@...ling.org>,
Paul Mackerras <paulus@...ba.org>,
Jiri Olsa <jolsa@...nel.org>,
lkml <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jan Stancek <jstancek@...hat.com>, lkp@...org
Subject: [lkp] [perf powerpc] 18d1796d0b: [No primary change]
[will-it-scale] perf-stat.branch-miss-rate +7.4% regression
Reply-To: kernel test robot <xiaolong.ye@...el.com>
User-Agent: Heirloom mailx 12.5 6/20/10
FYI, we noticed a +7.4% regression of perf-stat.branch-miss-rate due to commit:
commit 18d1796d0b45762ec6f58c5ed2ad3f7510ffbaa9 ("perf powerpc: Don't call perf_event_disable from atomic context")
https://github.com/0day-ci/linux Jiri-Olsa/perf-powerpc-Don-t-call-perf_event_disable-from-atomic-context/20161006-203500
in testcase: will-it-scale
on test machine: 32 threads Intel(R) Xeon(R) CPU E5-2680 0 @ 2.70GHz with 64G memory
with following parameters:
test: poll2
cpufreq_governor: performance
Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
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.
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/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/rootfs/tbox_group/test/testcase:
gcc-6/performance/x86_64-rhel-7.2/debian-x86_64-2016-08-31.cgz/lkp-sb03/poll2/will-it-scale
commit:
41aad2a6d4 (" perf/core improvements and fixes:")
18d1796d0b ("perf powerpc: Don't call perf_event_disable from atomic context")
41aad2a6d4fcdda8 18d1796d0b45762ec6f58c5ed2
---------------- --------------------------
fail:runs %reproduction fail:runs
| | |
%stddev %change %stddev
\ | \
0.19 ± 0% +7.4% 0.21 ± 0% perf-stat.branch-miss-rate%
9.591e+09 ± 1% +9.1% 1.047e+10 ± 0% perf-stat.branch-misses
1.962e+09 ± 0% +2.3% 2.008e+09 ± 1% perf-stat.cache-references
51.18 ± 2% +5.6% 54.06 ± 1% perf-stat.iTLB-load-miss-rate%
46430577 ± 5% -6.9% 43241506 ± 2% perf-stat.iTLB-loads
9.90 ± 4% +9.3% 10.82 ± 4% turbostat.Pkg%pc2
62066 ± 24% +34.7% 83582 ± 11% numa-meminfo.node1.Active
49531 ± 30% +42.9% 70778 ± 13% numa-meminfo.node1.Active(anon)
27883 ±100% -100.0% 0.00 ± -1% latency_stats.avg.proc_cgroup_show.proc_single_show.seq_read.__vfs_read.vfs_read.SyS_read.do_syscall_64.return_from_SYSCALL_64
27883 ±100% -100.0% 0.00 ± -1% latency_stats.max.proc_cgroup_show.proc_single_show.seq_read.__vfs_read.vfs_read.SyS_read.do_syscall_64.return_from_SYSCALL_64
32685 ± 38% +88.5% 61603 ±147% latency_stats.sum.call_rwsem_down_write_failed.path_openat.do_filp_open.do_sys_open.SyS_open.entry_SYSCALL_64_fastpath
27883 ±100% -100.0% 0.00 ± -1% latency_stats.sum.proc_cgroup_show.proc_single_show.seq_read.__vfs_read.vfs_read.SyS_read.do_syscall_64.return_from_SYSCALL_64
92795 ± 4% -8.6% 84853 ± 6% numa-vmstat.node0.numa_hit
92782 ± 4% -8.5% 84851 ± 6% numa-vmstat.node0.numa_local
12381 ± 30% +42.9% 17694 ± 13% numa-vmstat.node1.nr_active_anon
12381 ± 30% +42.9% 17694 ± 13% numa-vmstat.node1.nr_zone_active_anon
21.80 ± 59% -69.8% 6.58 ± 83% sched_debug.cpu.clock.stddev
21.80 ± 59% -69.8% 6.58 ± 83% sched_debug.cpu.clock_task.stddev
0.00 ± 23% -34.3% 0.00 ± 20% sched_debug.cpu.next_balance.stddev
35829 ± 9% -18.4% 29221 ± 6% sched_debug.cpu.nr_switches.max
8361 ± 6% -13.4% 7243 ± 7% sched_debug.cpu.nr_switches.stddev
8.43 ± 11% -25.2% 6.30 ± 12% sched_debug.cpu.nr_uninterruptible.stddev
18057 ± 6% -14.3% 15482 ± 8% sched_debug.cpu.sched_count.stddev
perf-stat.branch-miss-rate_
0.22 ++------------------------------------------------------------------+
| O |
0.215 ++ O OO |
O O O |
| O O |
0.21 ++ |
| O O |
0.205 ++ O OO O O O |
| |
0.2 ++ |
| |
| |
0.195 ++ *.*. *. *.*.* .* .**. *.**. *.*.* |
*.**.**.*.* * * *.* * *.* *.* *.**.*. *.*.**. *.*
0.19 ++-------------------------------------------------------*-------*--+
[*] bisect-good sample
[O] bisect-bad sample
Thanks,
Xiaolong
View attachment "config-4.8.0-rc7-00165-g18d1796" of type "text/plain" (152565 bytes)
View attachment "job-script" of type "text/plain" (6572 bytes)
View attachment "job.yaml" of type "text/plain" (4168 bytes)
View attachment "reproduce" of type "text/plain" (143 bytes)
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