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2026-05-07 - 13:48

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 376 highest latencies:
System rack9slot8s.osadl.org (updated Thu May 07, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501770,0irq/46-4a1000005590-21kworker/0:219:08:170
68749911447,0cyclictest81950irq/46-4a10000021:25:040
81950810,0irq/46-4a10000023718-21modprobe00:30:040
81950690,0irq/46-4a1000006963-21kworker/0:323:10:330
81950690,0irq/46-4a10000022378-21kworker/u2:000:21:160
81950680,0irq/46-4a1000009-21ksoftirqd/000:05:370
81950680,0irq/46-4a10000023808-21kworker/u2:221:25:320
82050660,0irq/47-4a10000031782-1kworker/u3:421:55:300
82050650,0irq/47-4a1000007009-21kworker/u2:623:10:020
82050640,0irq/47-4a1000005694-21kworker/u2:219:20:310
82050640,0irq/47-4a10000018358-1kworker/u3:423:55:300
81950640,0irq/46-4a10000013156-1kworker/u3:323:26:570
81950630,0irq/46-4a1000000-21swapper21:39:010
6874996352,0cyclictest81950irq/46-4a10000023:40:410
81950620,0irq/46-4a1000008390-1kworker/u3:319:20:040
6874996250,0cyclictest81950irq/46-4a10000019:57:330
81950610,0irq/46-4a10000031029-1kworker/u3:022:09:550
81950610,0irq/46-4a10000013776-21192.168.115.90-19:51:540
81950590,0irq/46-4a1000005476-1kworker/u3:322:41:530
81950580,0irq/46-4a10000019271-1kworker/u3:300:01:530
81950580,0irq/46-4a1000000-21swapper22:39:570
6874995832,0cyclictest31187-21runrttasks21:47:510
6874995746,0cyclictest81950irq/46-4a10000022:46:430
6874995734,0cyclictest31557-21latency_hist21:50:030
81950560,0irq/46-4a1000000-21swapper20:04:400
6874995645,0cyclictest81950irq/46-4a10000019:15:030
6874995645,0cyclictest81950irq/46-4a10000000:12:000
81950550,0irq/46-4a10000028133-1kworker/u3:621:33:540
6874995543,0cyclictest35150irq/20-4900000019:45:340
6874995430,0cyclictest81950irq/46-4a10000020:20:020
101540,0ktimersoftd/00-21swapper23:54:370
6874995343,0cyclictest81950irq/46-4a10000000:19:590
6874995333,0cyclictest5025-21runrttasks22:28:590
6874995317,0cyclictest23831-21munin-run21:00:010
101530,0ktimersoftd/00-21swapper23:33:430
6874995243,0cyclictest101ktimersoftd/020:35:020
6874995240,0cyclictest81950irq/46-4a10000000:36:190
6874995239,0cyclictest81950irq/46-4a10000022:34:140
6874995236,0cyclictest25404-21latency_hist21:10:030
6874995235,0cyclictest16868-21runrttasks20:12:560
6874995233,0cyclictest846-21runrttasks22:00:200
6874995140,0cyclictest81950irq/46-4a10000019:43:340
6874995134,0cyclictest21464-21runrttasks20:43:550
6874995134,0cyclictest15107-21latency_hist23:35:020
6874995133,0cyclictest23611-21idleruntime-cro00:30:000
6874995132,0cyclictest23083-21apt20:55:010
6874995042,0cyclictest101ktimersoftd/020:40:030
6874995034,0cyclictest21687-21latency_hist20:45:030
6874995034,0cyclictest17281-21latency_hist23:50:020
6874994939,0cyclictest0-21swapper23:19:230
6874994938,0cyclictest81950irq/46-4a10000019:33:290
6874994936,0cyclictest81950irq/46-4a10000022:51:080
6874994934,0cyclictest1930-21systemd-network20:29:100
6874994930,0cyclictest13011-21runrttasks23:20:400
6874994927,0cyclictest3652-21cron22:20:010
6874994835,0cyclictest94750irq/33-mmc020:05:400
6874994833,0cyclictest23952-21latency_hist21:00:040
6874994833,0cyclictest11867-21runrttasks19:39:380
6874994833,0cyclictest10224-21sendmail-mta23:03:550
6874994832,0cyclictest25329-21munin-run21:10:030
6874994830,0cyclictest18648-21munin-plugin-st20:25:020
6874994731,0cyclictest8964-21latency_hist22:55:030
6874994731,0cyclictest30613-21runrttasks21:44:130
6874994730,0cyclictest12113-21runrttasks22:21:090
6874994632,0cyclictest26323-21runrttasks21:16:160
6874994631,0cyclictest12113-21runrttasks22:10:040
6874994631,0cyclictest10303-21runrttasks19:28:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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