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2025-12-05 - 03:52

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 792 highest latencies:
System rack9slot8s.osadl.org (updated Fri Dec 05, 2025 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818501690,0irq/46-4a1000008109-21runrttasks19:08:320
81850890,0irq/46-4a10000023330-21ssh22:10:220
81850870,0irq/46-4a1000001947-21ls21:24:580
81950860,0irq/47-4a10000032636-21ssh22:30:150
81950830,0irq/47-4a1000009844-21ssh00:00:050
81850830,0irq/46-4a1000009732-21runrttasks00:00:020
81950820,0irq/47-4a10000023219-21rm23:19:450
81850820,0irq/46-4a10000016270-21ssh21:55:140
81950810,0irq/47-4a10000017073-21sshd23:06:250
81850810,0irq/46-4a1000009477-21ssh22:50:070
81850810,0irq/46-4a100000523-21ssh21:22:040
81850810,0irq/46-4a1000003902-21seq22:38:220
81850810,0irq/46-4a10000020526-21ssh00:22:590
81850810,0irq/46-4a10000012468-21ssh22:56:360
81850810,0irq/46-4a10000012465-21ssh21:47:110
81950800,0irq/47-4a10000031788-21ssh23:38:010
81950800,0irq/47-4a10000027740-21sendmail22:19:580
81850800,0irq/46-4a100000763-21ssh23:40:420
81850800,0irq/46-4a10000032673-21kworker/u2:300:18:210
81850800,0irq/46-4a10000022300-21ssh00:26:410
81850800,0irq/46-4a10000022247-21runrttasks22:08:090
81850800,0irq/46-4a10000014326-21ssh21:51:080
81950790,0irq/47-4a1000005792-21ssh23:51:340
81950790,0irq/47-4a10000024644-21ssh23:22:390
81850790,0irq/46-4a1000007969-21sh21:37:490
81850790,0irq/46-4a10000022283-21apt-get20:40:230
81850790,0irq/46-4a10000020642-21ssh23:14:120
81850790,0irq/46-4a10000013037-21ssh00:07:000
81950780,0irq/47-4a1000004973-21cron23:49:590
81950780,0irq/47-4a10000023778-21cron00:30:040
81950780,0irq/47-4a10000016685-21runrttasks20:01:360
81950780,0irq/47-4a10000010439-21lockfile-remove19:19:520
81850780,0irq/46-4a1000008551-21runrttasks19:09:590
81850780,0irq/46-4a1000005820-21chrt21:33:170
81850780,0irq/46-4a10000028990-21ssh21:13:470
81850780,0irq/46-4a10000028840-21ssh23:31:370
81850780,0irq/46-4a10000026391-21ssh00:35:220
81850780,0irq/46-4a10000026125-21runrttasks23:25:460
81850780,0irq/46-4a10000018853-21ssh22:00:450
81850780,0irq/46-4a10000016294-21ssh00:14:020
81850780,0irq/46-4a10000010407-21ssh21:42:470
257692780,0chrt25755-21kworker/u2:021:01:330
217912780,0chrt15959-21kworker/u2:120:36:060
81950770,0irq/47-4a10000026469-21readlink21:05:030
81950770,0irq/47-4a10000025438-21sendmail20:59:540
81950770,0irq/47-4a10000019325-21munin-run20:19:550
81950770,0irq/47-4a10000018112-21sshd20:11:170
81850770,0irq/46-4a1000006386-21ssh22:43:390
81850770,0irq/46-4a10000030935-21seq22:26:400
81950760,0irq/47-4a10000014733-21rm23:01:240
81850760,0irq/46-4a10000028225-21ssh22:20:500
147502760,0chrt14449-21kworker/u2:019:49:060
131052760,0chrt8852-21kworker/u2:219:37:530
81950750,0irq/47-4a10000027128-21diskmemload22:47:410
140622750,0chrt13703-21kworker/u2:319:44:290
81950740,0irq/47-4a10000024702-21munin-run20:54:550
81950740,0irq/47-4a10000012168-21sshd19:31:160
81950740,0irq/47-4a10000011071-21sshd19:24:160
81850740,0irq/46-4a10000030080-21ssh21:15:570
174612740,0sleep011886-21kworker/u2:420:06:580
81950720,0irq/47-4a10000021206-21sshd20:32:180
81950710,0irq/47-4a10000011681-21sshd19:28:150
158102710,0chrt13703-21kworker/u2:319:55:410
81950700,0irq/47-4a1000008852-21kworker/u2:219:54:510
237972690,0chrt23483-21kworker/u2:820:48:390
8321994934,0cyclictest20601-21runrttasks20:28:200
8321994630,0cyclictest15184-21lldpd20:21:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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