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2025-11-21 - 14:14

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 Fri Nov 21, 2025 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818501930,0irq/46-4a1000007282-21kworker/0:319:08:030
81850860,0irq/46-4a10000031162-21runrttasks21:18:350
81850850,0irq/46-4a10000013166-21seq00:06:500
81850830,0irq/46-4a10000027116-21seq23:27:180
81850820,0irq/46-4a10000015515-21seq00:11:500
81850810,0irq/46-4a10000019262-21ssh23:10:250
267142810,0sleep023864-21kworker/u2:622:17:320
81850800,0irq/46-4a1000003350-21ssh21:28:190
81850800,0irq/46-4a10000032075-21ssh22:28:520
81850800,0irq/46-4a10000023952-21ssh23:20:250
81850800,0irq/46-4a10000014127-21ssh22:59:390
97052790,0sleep032362-21kworker/u2:019:15:110
81850790,0irq/46-4a1000009086-21ssh23:58:110
81850790,0irq/46-4a1000002724-21chrt23:44:380
81850790,0irq/46-4a10000023183-21ssh00:28:190
81850790,0irq/46-4a10000014998-21ssh21:52:510
81850790,0irq/46-4a10000012690-21ssh21:48:000
81950780,0irq/47-4a1000009740-21ssh22:50:020
81950780,0irq/47-4a10000028617-21awk00:40:010
81850780,0irq/46-4a1000009-21ksoftirqd/000:20:010
81850780,0irq/46-4a1000006790-21ssh23:53:180
81850780,0irq/46-4a1000006365-21ssh22:42:550
81850780,0irq/46-4a1000005652-21ssh21:33:110
81850780,0irq/46-4a10000017270-21ssh23:06:100
105792780,0sleep09844-21kworker/u2:119:20:560
82822775,0sleep07982-21kworker/u2:822:47:000
81950770,0irq/47-4a10000028735-21kworker/u2:422:24:590
81850770,0irq/46-4a10000030896-21ssh23:35:200
81850770,0irq/46-4a10000022502-21ssh23:17:270
81850770,0irq/46-4a10000016763-21ssh21:56:310
81850770,0irq/46-4a10000015519-21ssh23:02:270
81950760,0irq/47-4a1000004853-21ssh22:39:570
81850760,0irq/46-4a10000032364-21ssh21:20:580
81850760,0irq/46-4a10000025331-21munin-run20:59:560
81850760,0irq/46-4a10000021391-21ssh00:24:320
81850760,0irq/46-4a10000011325-21ssh00:02:560
81950750,0irq/47-4a10000028308-21kworker/u2:323:32:080
81950750,0irq/47-4a10000025094-21ssh00:32:230
81950750,0irq/47-4a10000018505-21ssh22:00:040
81850750,0irq/46-4a10000023695-21ssh22:11:060
81850750,0irq/46-4a10000020796-21latency_hist22:04:590
81850740,0irq/46-4a10000022475-21kworker/u2:320:45:230
81850740,0irq/46-4a10000011379-21kworker/u2:419:59:520
81850740,0irq/46-4a10000011198-21cron21:44:550
145382740,0sleep09847-21kworker/u2:219:48:100
81950730,0irq/47-4a10000028587-21ssh21:13:090
81850730,0irq/46-4a1000008564-21seq19:10:150
81850730,0irq/46-4a1000006899-21ssh21:35:420
81850730,0irq/46-4a100000459-21ssh22:30:310
81850730,0irq/46-4a10000032362-21kworker/u2:019:34:510
203072730,0chrt20206-21kworker/u2:520:26:460
183992730,0sleep017304-21kworker/u2:020:14:290
176532730,0chrt16556-21kworker/u2:220:09:220
151092730,0sleep015029-21kworker/u2:119:51:440
117582730,0sleep09844-21kworker/u2:119:29:380
81850720,0irq/46-4a10000023418-21kworker/u2:521:00:000
81850720,0irq/46-4a10000021425-21sh20:34:520
263992720,0chrt23418-21kworker/u2:521:05:020
81950710,0irq/47-4a1000003650-21ssh23:46:290
81950710,0irq/47-4a10000021701-21kworker/u2:420:54:550
81950710,0irq/47-4a10000021676-21runrttasks20:35:590
81950710,0irq/47-4a10000013280-21munin-run19:39:530
228072710,0chrt22475-21kworker/u2:320:44:040
165052710,0chrt13651-21kworker/u2:320:00:550
189922680,0sleep015029-21kworker/u2:120:18:140
81950660,0irq/47-4a10000015180-21lldpd20:20:050
81950630,0irq/47-4a10000012876-1kworker/u3:119:41:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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