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Message-ID: <20161219001453.GD1723@yexl-desktop>
Date: Mon, 19 Dec 2016 08:14:53 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp-developer] [sched/core] 6b94780e45: unixbench.score -4.5%
regression
Greeting,
FYI, we noticed a -4.5% regression of unixbench.score due to commit:
commit: 6b94780e45c17b83e3e75f8aaca5a328db583c74 ("sched/core: Use load_avg for selecting idlest group")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
in testcase: unixbench
on test machine: 24 threads Nehalem-EP with 24G memory
with following parameters:
runtime: 300s
nr_task: 100%
test: shell1
cpufreq_governor: performance
test-description: UnixBench is the original BYTE UNIX benchmark suite aims to test performance of Unix-like system.
test-url: https://github.com/kdlucas/byte-unixbench
In addition to that, the commit also has significant impact on the following tests:
+------------------+-----------------------------------------------------------------------+
| testcase: change | unixbench: unixbench.score -2.9% regression |
| test machine | 8 threads Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz with 6G memory |
| test parameters | nr_task=1 |
| | runtime=300s |
| | test=shell8 |
+------------------+-----------------------------------------------------------------------+
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
testcase/path_params/tbox_group/run: unixbench/300s-100%-shell1-performance/lkp-wsm-ep1
f519a3f1c6b7a990 6b94780e45c17b83e3e75f8aac
---------------- --------------------------
25565 -5% 24414 unixbench.score
29557557 28781098 unixbench.time.voluntary_context_switches
5743 -4% 5514 unixbench.time.user_time
9.232e+08 -4% 8.831e+08 unixbench.time.minor_page_faults
1807 -5% 1709 unixbench.time.percent_of_cpu_this_job_got
5656 -7% 5271 unixbench.time.system_time
13223805 -20% 10628072 unixbench.time.involuntary_context_switches
741766 -62% 279054 interrupts.CAL:Function_call_interrupts
31060 -9% 28214 vmstat.system.in
126250 -12% 110890 vmstat.system.cs
78.58 -6% 74.20 turbostat.%Busy
2507 -6% 2366 turbostat.Avg_MHz
9134 ± 47% -6e+03 2973 ± 36% latency_stats.max.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath
380879 ± 10% 5e+05 887692 ± 49% latency_stats.sum.wait_on_page_bit_killable.__lock_page_or_retry.filemap_fault.__do_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
31710 ± 15% -2e+04 10583 ± 14% latency_stats.sum.call_rwsem_down_write_failed.__vma_adjust.__split_vma.do_munmap.vm_munmap.elf_map.load_elf_binary.search_binary_handler.do_execveat_common.SyS_execve.do_syscall_64.return_from_SYSCALL_64
51796 ± 4% -4e+04 15457 ± 10% latency_stats.sum.call_rwsem_down_write_failed.unlink_file_vma.free_pgtables.unmap_region.do_munmap.vm_munmap.elf_map.load_elf_binary.search_binary_handler.do_execveat_common.SyS_execve.do_syscall_64
111998 ± 18% -7e+04 37074 ± 14% latency_stats.sum.call_rwsem_down_write_failed.__vma_adjust.__split_vma.do_munmap.mmap_region.do_mmap.vm_mmap_pgoff.SyS_mmap_pgoff.SyS_mmap.entry_SYSCALL_64_fastpath
275087 ± 15% -2e+05 81973 ± 3% latency_stats.sum.call_rwsem_down_write_failed.unlink_file_vma.free_pgtables.unmap_region.do_munmap.mmap_region.do_mmap.vm_mmap_pgoff.SyS_mmap_pgoff.SyS_mmap.entry_SYSCALL_64_fastpath
930993 ± 12% -6e+05 320520 ± 4% latency_stats.sum.call_rwsem_down_write_failed.vma_link.mmap_region.do_mmap.vm_mmap_pgoff.vm_mmap.elf_map.load_elf_binary.search_binary_handler.do_execveat_common.SyS_execve.do_syscall_64
4755783 ± 9% -3e+06 1619348 ± 4% latency_stats.sum.call_rwsem_down_write_failed.__vma_adjust.__split_vma.split_vma.mprotect_fixup.do_mprotect_pkey.SyS_mprotect.entry_SYSCALL_64_fastpath
5536067 ± 10% -4e+06 1929338 ± 3% latency_stats.sum.call_rwsem_down_write_failed.copy_process._do_fork.SyS_clone.do_syscall_64.return_from_SYSCALL_64
9.032e+08 -4% 8.64e+08 perf-stat.page-faults
9.032e+08 -4% 8.64e+08 perf-stat.minor-faults
2.329e+09 2.269e+09 perf-stat.node-load-misses
2.2e+09 -9% 2.011e+09 ± 5% perf-stat.dTLB-store-misses
3.278e+10 -9% 2.987e+10 ± 6% perf-stat.dTLB-load-misses
19484819 13% 21974129 perf-stat.cpu-migrations
3.755e+13 -6% 3.54e+13 perf-stat.cpu-cycles
3244 4% 3379 perf-stat.instructions-per-iTLB-miss
4.536e+12 -4% 4.332e+12 perf-stat.branch-instructions
2.303e+13 -4% 2.208e+13 perf-stat.instructions
5.768e+12 -4% 5.517e+12 perf-stat.dTLB-loads
3.567e+11 -4% 3.414e+11 perf-stat.cache-references
2.97 2.93 perf-stat.branch-miss-rate%
2.768e+10 2.699e+10 perf-stat.node-stores
5.446e+10 -3% 5.275e+10 perf-stat.cache-misses
0.03 -4% 0.03 perf-stat.iTLB-load-miss-rate%
9.673e+09 -4% 9.294e+09 perf-stat.node-loads
3.596e+12 -4% 3.442e+12 perf-stat.dTLB-stores
0.61 0.62 perf-stat.ipc
1.347e+11 -6% 1.27e+11 perf-stat.branch-misses
7.098e+09 -8% 6.533e+09 perf-stat.iTLB-load-misses
2.309e+13 -4% 2.206e+13 perf-stat.iTLB-loads
79911173 -12% 70187035 perf-stat.context-switches
turbostat._Busy
90 ++-------------------------------------*---*---------------------------+
| .. *...*.. |
80 *+..*..*...*..*...*..*...*..*...O...* O O O O O...O..O...O O O
70 O+ O O O O O O O O |
| |
60 ++ |
50 ++ |
| |
40 ++ |
30 ++ |
| |
20 ++ |
10 ++ |
| |
0 ++----------------------------------O----------------------------------+
unixbench.time.percent_of_cpu_this_job_got
2500 ++-------------------------------------------------------------------+
| |
| .*... |
2000 ++ .*. *..*... |
*..*...*..*...*..*...*..*...*..O...*. O O O O O..O...O..O O O
O O O O O O O O O |
1500 ++ |
| |
1000 ++ |
| |
| |
500 ++ |
| |
| |
0 ++---------------------------------O---------------------------------+
vmstat.system.in
40000 ++------------------------------------------------------------------+
| .*...*.. |
35000 ++ .*...*. |
30000 *+.*...*..*...*..*..*...*..*...*..*. *..*...*..* |
O O O O O O O O O O O O O O O O O O O O
25000 ++ |
| |
20000 ++ |
| |
15000 ++ |
10000 ++ |
| |
5000 ++ |
| |
0 ++--------------------------------O---------------------------------+
[*] 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,
Xiaolong
View attachment "config-4.9.0-rc8-00179-g6b94780" of type "text/plain" (153757 bytes)
View attachment "job-script" of type "text/plain" (6406 bytes)
View attachment "job.yaml" of type "text/plain" (4038 bytes)
View attachment "reproduce" of type "text/plain" (128 bytes)
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