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2026-09-17 - 09:53

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 50 highest latencies:
System rack2slot7s.osadl.org (updated Thu Sep 17, 2026 00:42:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4102068995846,8cyclictest265-21systemd-journal22:29:162
4102067995142,6cyclictest4156524-21latency_hist21:40:021
4102068994942,4cyclictest4127567-21kworker/u8:13+xprtiod20:35:012
4102068994942,4cyclictest4127567-21kworker/u8:13+xprtiod20:35:012
4102068994739,5cyclictest4136576-21systemd-run21:05:012
4102068994738,6cyclictest1003-21mta-sts-daemon23:26:212
4102067994638,3cyclictest0-21swapper/123:51:241
410206699469,25cyclictest4138052-21diskmemload21:51:230
410206799452,34cyclictest18634-21ssh23:11:161
410206799452,34cyclictest18634-21ssh23:11:161
4102066994538,5cyclictest539-21wpa_supplicant00:00:010
410206699453,4cyclictest0-21swapper/000:06:170
4102068994437,4cyclictest1001-21mta-sts-daemon23:47:382
4102067994436,5cyclictest1000-21mta-sts-daemon21:56:121
4102067994435,5cyclictest47784-21dpkg-db-backup00:00:011
4102066994436,5cyclictest47853-21cups-browsed00:03:010
4102068994335,4cyclictest4138052-21diskmemload00:00:012
4102067994335,5cyclictest4159557-21systemd-run21:45:011
4102068994236,3cyclictest0-21swapper/222:40:012
4102068994232,7cyclictest1003-21mta-sts-daemon00:21:052
410206799424,26cyclictest421-21dbus-daemon00:31:181
4102068994135,3cyclictest0-21swapper/223:01:012
4102068994135,3cyclictest0-21swapper/223:01:012
4102068994133,5cyclictest4129035-21cron20:40:002
4102068994133,5cyclictest4129035-21cron20:40:002
4102068994132,6cyclictest4152154-21grep21:31:242
4102068994034,3cyclictest0-21swapper/222:49:042
4102068994031,5cyclictest4171701-21cut22:05:012
4102068994030,6cyclictest2402979-21cups-browsed21:56:562
4102067994034,4cyclictest4102065-21cyclictest22:50:011
4102067994032,5cyclictest6943-21unixbench_multi22:51:241
4102067994032,5cyclictest2402979-21cups-browsed23:36:021
4102067994031,4cyclictest0-21swapper/119:51:171
4102066994031,5cyclictest1003-21mta-sts-daemon22:08:480
4102066994020,14cyclictest24818-21ssh23:21:190
4102068993930,5cyclictest9504-21ntpq22:56:172
4102067993934,2cyclictest0-21swapper/121:10:011
4102067993931,5cyclictest4109542-21cron19:35:001
4102067993931,5cyclictest4108073-21systemd-run19:30:011
4102067993931,5cyclictest4108073-21systemd-run19:30:011
4102067993930,5cyclictest4171703-21sh22:05:011
410206799392,28cyclictest9530-21ssh22:56:181
4102066993929,6cyclictest1-21systemd23:45:020
4102066993927,9cyclictest4177787-21munin-plugin-st22:15:010
4102068993830,6cyclictest35630-21basename23:40:012
4102066993829,6cyclictest2402979-21cups-browsed23:46:320
410206899376,8cyclictest171rcu_preempt19:26:122
410206899376,8cyclictest171rcu_preempt19:26:122
4102068993732,2cyclictest0-21swapper/221:55:012
4102068993732,2cyclictest0-21swapper/221:00:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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