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2025-12-10 - 10:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #8

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 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.

Total number of samples: 50 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 highest latencies:
System rack9slot8s.osadl.org (updated Wed Dec 10, 2025 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501600,0irq/47-4a10000030470-21runrttasks19:09:050
81950910,0irq/47-4a10000018168-21ssh00:38:200
81950910,0irq/47-4a1000001726-21kworker/u2:322:03:060
81950900,0irq/47-4a1000003740-21sshd21:50:350
81950890,0irq/47-4a1000009377-21ssh23:10:320
81950870,0irq/47-4a1000006214-21sendmail-msp19:59:520
81850870,0irq/46-4a1000007982-21ssh21:59:430
81950860,0irq/47-4a1000006733-21ssh00:14:130
81950860,0irq/47-4a10000032450-21sendmail00:00:010
81950860,0irq/47-4a10000031746-21kworker/u2:221:46:190
81950860,0irq/47-4a10000014287-21ssh22:12:550
200032866,0sleep020008-21ssh23:33:350
81950850,0irq/47-4a10000023284-21rm23:40:240
81850850,0irq/46-4a10000032413-21ssh22:50:590
81850850,0irq/46-4a10000025275-21ssh22:35:570
298562859,0sleep029862-21ssh23:54:340
161122859,0sleep016117-21ssh22:16:420
81950840,0irq/47-4a100000425-21ssh21:43:460
81950840,0irq/47-4a10000029544-21sed22:45:000
81950840,0irq/47-4a10000019366-21ssh21:15:090
81950840,0irq/47-4a10000010331-21ssh00:21:400
81850840,0irq/46-4a1000005837-21ssh23:03:270
81850840,0irq/46-4a10000027295-21ssh23:49:040
143742848,0sleep014379-21ssh23:21:260
81950830,0irq/47-4a1000008182-21runrttasks23:08:240
81950830,0irq/47-4a1000006925-21cron20:04:530
81950830,0irq/47-4a1000004155-21latency_hist23:00:010
81950830,0irq/47-4a10000026301-21latency_hist21:29:590
81950830,0irq/47-4a10000024746-21ssh22:34:570
81950830,0irq/47-4a10000018543-21ssh21:13:350
81950830,0irq/47-4a10000011626-21runrttasks20:36:050
81850830,0irq/46-4a10000013109-21ssh00:27:360
317352838,0sleep031741-21ssh22:49:440
81950820,0irq/47-4a10000032510-21awk19:19:520
81950820,0irq/47-4a10000022816-21sshd23:39:380
81950820,0irq/47-4a10000013601-21ssh23:19:590
81950820,0irq/47-4a10000012532-21runrttasks20:42:150
81850820,0irq/46-4a10000011150-21ssh22:06:120
81950810,0irq/47-4a1000009491-21plymouth00:20:020
81950810,0irq/47-4a1000009153-21sendmail20:19:540
81950810,0irq/47-4a1000004405-21ssh00:09:250
81950810,0irq/47-4a1000002206-21ssh00:04:440
81950810,0irq/47-4a10000016967-21ssh23:26:580
81950810,0irq/47-4a10000016720-21sshd21:09:350
81950810,0irq/47-4a10000015839-21kworker/u2:422:27:270
81950810,0irq/47-4a1000001545-21latency_hist19:29:530
81950810,0irq/47-4a10000013851-1kworker/u3:420:54:540
81850810,0irq/46-4a10000019548-21ssh22:24:000
81950800,0irq/47-4a1000007123-21sshd20:05:320
81950800,0irq/47-4a1000004708-21latency_hist19:49:530
81950800,0irq/47-4a10000031336-21apt19:14:510
81950800,0irq/47-4a10000015084-21cron20:59:540
81950800,0irq/47-4a10000015076-21kworker/u2:521:39:050
81950800,0irq/47-4a10000011145-21runrttasks20:33:080
81950800,0irq/47-4a10000010521-21seq20:29:000
81850800,0irq/46-4a10000022683-21ssh21:22:110
81950790,0irq/47-4a10000030164-21kworker/u2:219:40:210
81950790,0irq/47-4a10000024981-21ssh21:27:020
81950790,0irq/47-4a10000014889-21ssh00:31:180
81950780,0irq/47-4a1000003032-21munin-run19:39:540
11722780,0sleep030164-21kworker/u2:219:26:550
81950770,0irq/47-4a10000015843-21sh21:04:530
48362770,0sleep04279-21kworker/u2:019:50:020
81950760,0irq/47-4a1000009730-21sshd20:23:330
133312740,0sleep013230-21kworker/u2:220:47:450
81282710,0sleep07924-21kworker/u2:020:12:440
101590,0ktimersoftd/00-21swapper19:22:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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