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2026-08-05 - 03:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click here to display the system's profile data or here to proceed to next system.
Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack2slot7s.osadl.org (updated Wed Aug 05, 2026 00:43:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2917796995645,7cyclictest3016565-21threads22:51:031
291779699512,39cyclictest2988635-21ssh22:05:521
2917797994940,6cyclictest3042636-21sh23:35:012
2917797994924,3cyclictest171rcu_preempt19:30:522
2917795994825,16cyclictest151ktimers/020:40:530
2917797994735,8cyclictest3053540-21head23:51:042
291779799472,36cyclictest958-21sendmail-mta20:50:532
291779799471,4cyclictest2953771-21diskmemload22:45:512
2917795994732,12cyclictest3068830-21ssh00:16:040
2917797994638,5cyclictest3036511-21ssh23:25:002
2917797994638,5cyclictest3027335-21latency_hist23:10:022
2917796994617,12cyclictest2935128-21ntpq20:05:501
2917795994639,4cyclictest151ktimers/020:55:530
2917796994521,18cyclictest3043761-21ntpq23:35:551
2917796994518,9cyclictest3049903-21ntpq23:45:541
2917795994537,5cyclictest0-21swapper/023:20:540
2917795994525,13cyclictest151ktimers/019:20:570
2917795994525,13cyclictest151ktimers/019:20:570
2917796994426,13cyclictest271ktimers/122:40:511
2917796994420,9cyclictest2952422-21date21:05:031
2917796994418,8cyclictest3057883-21ssh23:59:591
2917795994418,18cyclictest151ktimers/019:25:560
2917796994323,15cyclictest421-21dbus-daemon00:00:531
2917796994317,16cyclictest0-21swapper/119:30:521
2917797994233,5cyclictest2996692-21munin-run22:20:002
2917797994232,6cyclictest439-21systemd-logind20:00:022
291779699423,30cyclictest2985630-21ssh22:00:551
2917796994229,10cyclictest3068672-21timerandwakeup00:16:031
2917796994228,8cyclictest2930699-21ntpq19:50:541
2917796994217,7cyclictest3026583-21sh23:07:481
2917796994217,7cyclictest2944183-21ntpq20:35:581
2917796994215,12cyclictest3005111-21ssh22:32:401
2917795994230,8cyclictest151ktimers/023:25:550
2917797994133,5cyclictest3048746-21systemd-run23:45:012
2917797994132,6cyclictest2952303-21systemd-run21:05:022
2917797994130,7cyclictest2969683-21aten_r2power_en21:35:432
2917797994129,6cyclictest0-21swapper/200:25:542
2917796994134,4cyclictest3082420-21cron00:40:001
2917796994134,4cyclictest3082420-21cron00:40:001
2917796994128,8cyclictest2939656-21ntpq20:20:481
2917796994127,8cyclictest2921676-21ntpq19:20:531
2917796994127,8cyclictest2921676-21ntpq19:20:531
2917796994126,11cyclictest2947750-21sshd20:46:331
2917796994117,9cyclictest3062791-21users00:06:091
2917796994117,8cyclictest1002-21mta-sts-daemon20:10:521
2917795994128,10cyclictest2944638-21unixbench_multi20:36:080
2917795994125,12cyclictest3071401-21ssh00:20:570
2917797994032,5cyclictest3070229-21systemd00:20:022
2917797994031,6cyclictest2944813-21systemd-run20:40:012
291779799401,6cyclictest171rcu_preempt22:40:552
2917796994031,5cyclictest2999758-21cron22:25:001
2917796994028,9cyclictest2983033-21timerwakeupswit21:56:031
291779699402,29cyclictest3077451-21rm00:30:521
2917795994033,4cyclictest2999757-21cron22:25:000
2917795994033,4cyclictest2988412-21kernelversion22:05:490
2917795994033,4cyclictest2949341-21latency_hist20:55:020
2917795994031,6cyclictest3046858-21ssh23:40:540
2917797993930,6cyclictest2960055-21latency_hist21:20:032
2917797993930,5cyclictest0-21swapper/222:55:552
2917797993927,9cyclictest3071684-21switchtime00:21:052
2917796993927,7cyclictest2941270-21ntpq20:26:001
2917796993926,8cyclictest3028452-21ntpq23:10:531
2917796993925,11cyclictest2934265-21sshd20:03:341
2917796993925,10cyclictest2919504-21/usr/sbin/munin19:16:061
291779699392,31cyclictest3040693-21ssh23:30:511
2917796993915,9cyclictest2962554-21ssh21:23:371
2917795993932,4cyclictest2972330-21latency_hist21:40:020
2917795993931,5cyclictest2987555-21systemd-run22:05:020
2917795993928,9cyclictest3032060-21unixbench_multi23:16:040
2917795993920,13cyclictest12650irq/32-eth021:50:490
2917797993828,5cyclictest0-21swapper/221:05:482
291779799381,3cyclictest70-21kswapd000:30:562
291779699384,28cyclictest3034542-21ssh23:20:501
2917796993830,5cyclictest3071826-21timerwakeupswit00:21:061
2917796993828,7cyclictest421-21dbus-daemon21:00:021
2917796993825,9cyclictest2938114-21ntpq20:15:491
2917796993825,9cyclictest2926118-21ntpq19:35:501
2917796993824,11cyclictest2932123-21ntpq19:55:501
2917796993824,10cyclictest2945633-21ntpq20:40:521
2917796993824,10cyclictest1-21systemd21:35:441
2917796993821,12cyclictest3008098-21ssh22:37:301
2917796993820,12cyclictest3074354-21ssh00:25:511
2917796993817,7cyclictest2996751-21cat22:20:011
2917796993815,7cyclictest3024170-21sh23:04:481
2917795993832,3cyclictest1002-21mta-sts-daemon20:20:480
2917795993827,8cyclictest151ktimers/019:35:540
2917795993826,9cyclictest3056192-21wc23:55:580
2917795993818,14cyclictest421-21dbus-daemon20:25:550
2917797993729,5cyclictest2946307-21systemd-run20:45:022
2917797993729,5cyclictest1-21systemd22:10:022
291779799370,5cyclictest171rcu_preempt23:55:492
2917796993729,5cyclictest2973992-21unixbench_singl21:41:061
2917796993728,3cyclictest0-21swapper/100:10:451
2917796993727,7cyclictest2955223-21/usr/sbin/munin21:11:031
2917796993727,6cyclictest1215473-21cups-browsed23:50:151
2917796993726,7cyclictest3037754-21ntpq23:25:561
2917796993724,9cyclictest421-21dbus-daemon22:56:171
2917796993724,10cyclictest2922824-21/usr/sbin/munin19:25:461
2917796993722,11cyclictest2927768-21ntpq19:40:591
2917796993718,7cyclictest2948229-21awk20:50:441
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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