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Date: Tue, 5 Apr 2016 16:46:02 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Jens Axboe <axboe@...com>
Cc: LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [writeback] f7486eef5e: No primary change,
fsmark.time.involuntary_context_switches -35.1%
FYI, we noticed that fsmark.time.involuntary_context_switches -35.1% change on
=========================================================================================
compiler/cpufreq_governor/disk/filesize/fs/iterations/kconfig/nr_directories/nr_files_per_directory/nr_threads/rootfs/sync_method/tbox_group/test_size/testcase:
gcc-4.9/performance/1HDD/9B/xfs/1x/x86_64-rhel/16d/256fpd/32t/debian-x86_64-2015-02-07.cgz/fsyncBeforeClose/lkp-sb02/400M/fsmark
commit:
5569d5f86db30a2d202ed57222a177d32a2234b3
f7486eef5ea239905ed71f2316a40eae757ffed2
5569d5f86db30a2d f7486eef5ea239905ed71f2316
---------------- --------------------------
fail:runs %reproduction fail:runs
%stddev %change %stddev
\ | \
106141 ± 0% -35.1% 68920 ± 0% fsmark.time.involuntary_context_switches
342173 ± 0% +35.8% 464725 ± 0% fsmark.time.voluntary_context_switches
284.90 ± 4% -41.7% 166.22 ± 18% slabinfo.blkdev_requests.num_objs
106141 ± 0% -35.1% 68920 ± 0% time.involuntary_context_switches
342173 ± 0% +35.8% 464725 ± 0% time.voluntary_context_switches
27.89 ± 28% -20.6% 22.16 ± 2% turbostat.CPU%c6
9.13 ± 11% +13.2% 10.34 ± 0% turbostat.CorWatt
6.91 ± 65% -38.0% 4.28 ± 5% turbostat.Pkg%pc6
12.63 ± 8% +9.7% 13.85 ± 0% turbostat.PkgWatt
48250249 ± 1% +101.0% 96965425 ± 1% cpuidle.C1-SNB.time
95999 ± 2% +69.6% 162769 ± 0% cpuidle.C1-SNB.usage
2.015e+08 ± 4% +15.3% 2.325e+08 ± 1% cpuidle.C1E-SNB.time
185631 ± 4% +23.7% 229659 ± 1% cpuidle.C1E-SNB.usage
15292 ± 2% +32.4% 20248 ± 2% cpuidle.C3-SNB.usage
563.70 ± 23% -23.9% 429.22 ± 7% cpuidle.POLL.usage
38.96 ± 18% +183.2% 110.33 ± 35% sched_debug.cfs_rq:/.exec_clock.stddev
-4107 ± -4% -64.2% -1470 ±-30% sched_debug.cpu.nr_uninterruptible.min
2469 ± 3% -53.6% 1145 ± 31% sched_debug.cpu.nr_uninterruptible.stddev
28646 ± 1% +45.2% 41602 ± 34% sched_debug.cpu.sched_goidle.avg
19183 ± 3% +74.9% 33552 ± 33% sched_debug.cpu.sched_goidle.min
16895 ± 4% +55.3% 26246 ± 35% sched_debug.cpu.ttwu_count.min
0.00 ± -1% +Inf% 19531 ± 7% latency_stats.avg.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio._xfs_buf_ioapply.xfs_buf_submit.xlog_bdstrat.xlog_sync.xlog_state_release_iclog._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range
0.00 ± -1% +Inf% 19304 ± 2% latency_stats.avg.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio.xfs_submit_ioend_bio.xfs_submit_ioend.xfs_vm_writepages.do_writepages.__filemap_fdatawrite_range.filemap_write_and_wait_range.xfs_file_fsync.vfs_fsync_range
41.10 ± 20% +25703.2% 10605 ± 1% latency_stats.avg.flush_work.xlog_cil_force_lsn._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range.do_fsync.SyS_fsync.entry_SYSCALL_64_fastpath
0.00 ± -1% +Inf% 49655 ± 0% latency_stats.hits.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio.xfs_submit_ioend_bio.xfs_submit_ioend.xfs_vm_writepages.do_writepages.__filemap_fdatawrite_range.filemap_write_and_wait_range.xfs_file_fsync.vfs_fsync_range
401.30 ± 13% +17370.5% 70109 ± 1% latency_stats.hits.flush_work.xlog_cil_force_lsn._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range.do_fsync.SyS_fsync.entry_SYSCALL_64_fastpath
1.20 ± 62% +8.9e+05% 10737 ± 5% latency_stats.hits.xlog_cil_force_lsn._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range.do_fsync.SyS_fsync.entry_SYSCALL_64_fastpath
0.00 ± -1% +Inf% 107042 ± 34% latency_stats.max.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio._xfs_buf_ioapply.xfs_buf_submit.xlog_bdstrat.xlog_sync.xlog_state_release_iclog._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range
0.00 ± -1% +Inf% 215477 ± 7% latency_stats.max.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio.xfs_submit_ioend_bio.xfs_submit_ioend.xfs_vm_writepages.do_writepages.__filemap_fdatawrite_range.filemap_write_and_wait_range.xfs_file_fsync.vfs_fsync_range
752.00 ±164% +17984.7% 135997 ± 11% latency_stats.max.flush_work.xlog_cil_force_lsn._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range.do_fsync.SyS_fsync.entry_SYSCALL_64_fastpath
0.00 ± -1% +Inf% 1548061 ± 14% latency_stats.sum.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio._xfs_buf_ioapply.xfs_buf_submit.xlog_bdstrat.xlog_sync.xlog_state_release_iclog._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range
0.00 ± -1% +Inf% 9.584e+08 ± 1% latency_stats.sum.blk_wb_wait.blk_queue_bio.generic_make_request.submit_bio.xfs_submit_ioend_bio.xfs_submit_ioend.xfs_vm_writepages.do_writepages.__filemap_fdatawrite_range.filemap_write_and_wait_range.xfs_file_fsync.vfs_fsync_range
16575 ± 19% +4.5e+06% 7.436e+08 ± 2% latency_stats.sum.flush_work.xlog_cil_force_lsn._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range.do_fsync.SyS_fsync.entry_SYSCALL_64_fastpath
6.10 ±187% +8.6e+06% 524627 ± 26% latency_stats.sum.xlog_cil_force_lsn._xfs_log_force_lsn.xfs_file_fsync.vfs_fsync_range.do_fsync.SyS_fsync.entry_SYSCALL_64_fastpath
lkp-sb02: Sandy Bridge-EP
Memory: 4G
fsmark.time.voluntary_context_switches
500000 ++-----------------------------------------------------------------+
450000 OO O O O O O OO O OO O OO O OOO OO OOOOOOOOO OOOOO |
| |
400000 ++ |
350000 *+ *** * ** * ** * * * ** * ** *** ******* **** ***.* *********
|** : : :: : :: : :* : :: : : *.* ** * * * |
300000 ++ : : :: : :: : :: : :: : : |
250000 ++ : : : : : :: : :: : :: : : |
200000 ++ : : : : : :: : :: : :: : : |
| :::: : ::: ::::: ::: :::: |
150000 ++ : : :: : : : : : : : |
100000 ++ : : :: : : : : : : : |
| : : : : : : : : : : |
50000 ++ : : : : : : : : : : |
0 ++O-OO*O*O--O-O--O-O--O-O--O-O------O---------O--------------------+
fsmark.time.involuntary_context_switches
120000 ++-----------------------------------------------------------------+
| |
100000 ****** * ** * ** * ** * ** * ***.**********************.***********
| : : :: : :: : :: : :: : : |
| : : :: : :: : :: : :: : : |
80000 ++ : : : : : :: : :: : :: : : |
OO O :O:O:O: O OO O OO O OO O OOO OO OOOOOOOOO OOOOO |
60000 ++ : : : : : :: : :: : :: : : |
| :::: : ::: :::: :::: :::: |
40000 ++ : : :: : : : : : : : |
| : : :: : : : : : : : |
| : : : : : : : : : : |
20000 ++ : : : : : : : : : : |
| : : : : : : : : : : |
0 ++O-OO*O*O--O-O--O-O--O-O--O-O------O---------O--------------------+
[*] bisect-good sample
[O] bisect-bad sample
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
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 Ye
View attachment "job.yaml" of type "text/plain" (3870 bytes)
View attachment "reproduce" of type "text/plain" (1025 bytes)
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