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2026-03-29 - 07:59

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 Sun Mar 29, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501610,0irq/46-4a1000002163-21runrttasks19:05:260
2076328515,0sleep020775-21ssh23:25:010
81950830,0irq/46-4a10000010612-21apt-get21:55:260
81950810,0irq/46-4a10000025728-21sshd23:35:210
81950790,0irq/46-4a10000022067-21ssh00:36:130
81950780,0irq/46-4a1000008152-21ssh00:06:400
82050770,0irq/47-4a10000021592-21kworker/u2:221:18:030
81950770,0irq/46-4a10000032745-21ssh21:33:180
81950770,0irq/46-4a1000001466-21ssh23:52:320
82050760,0irq/47-4a10000010637-21http21:55:050
81950760,0irq/46-4a10000031898-21latency_hist22:40:060
81950760,0irq/46-4a10000020013-21ssh00:31:560
81950760,0irq/46-4a10000015800-21seq00:22:580
81950760,0irq/46-4a10000012182-21runrttasks23:06:510
81950750,0irq/46-4a1000005712-21kworker/u2:019:35:130
81950750,0irq/46-4a1000004240-21ssh21:41:280
81950750,0irq/46-4a1000003325-21ssh23:56:250
81950750,0irq/46-4a10000030312-21apt-config23:45:050
81950750,0irq/46-4a10000023817-21ssh22:22:490
81950740,0irq/46-4a1000005654-21ssh00:01:210
81950740,0irq/46-4a10000029030-21ssh21:25:200
81950740,0irq/46-4a10000013616-21runrttasks22:01:050
81950730,0irq/46-4a1000007829-21ssh22:57:430
81950720,0irq/46-4a1000006892-21munin-run19:35:030
81950720,0irq/46-4a1000004866-21kworker/u2:022:54:530
81950720,0irq/46-4a10000032692-21sort23:50:070
81950720,0irq/46-4a10000018803-21runrttasks20:50:320
81950720,0irq/46-4a10000016916-21kworker/u2:323:25:200
81950720,0irq/46-4a10000016512-21ssh22:07:120
81950720,0irq/46-4a10000012113-21runrttasks21:21:540
170352720,0chrt16916-21kworker/u2:323:17:100
81950710,0irq/46-4a1000001705-21ssh21:36:100
81950710,0irq/46-4a10000014514-21kworker/u2:123:33:290
81950710,0irq/46-4a10000012799-21kworker/u2:521:05:010
81950710,0irq/46-4a10000011162-21kworker/0:220:05:320
81950700,0irq/46-4a1000006509-21kworker/u2:123:00:180
81950700,0irq/46-4a10000023301-21kworker/u2:122:34:460
81950700,0irq/46-4a10000020089-21cron21:00:000
81950700,0irq/46-4a10000018496-21kworker/u2:422:12:560
81950700,0irq/46-4a10000012086-21snmpd00:18:530
57612700,0sleep05712-21kworker/u2:019:26:570
138102700,0chrt8933-21kworker/u2:020:18:460
107262700,0sleep010299-21kworker/u2:219:59:380
81950690,0irq/46-4a10000032097-21runrttasks22:40:130
81950690,0irq/46-4a10000012105-21kworker/u2:223:12:140
153322690,0chrt15081-21kworker/u2:020:28:580
255962680,0chrt29489-21kworker/u2:022:26:340
22352680,0chrt489-21kworker/u2:722:45:430
182462680,0chrt12799-21kworker/u2:520:48:320
87122670,0chrt7811-21kworker/u2:419:45:120
82050670,0irq/47-4a1000004914-21runrttasks19:21:030
82050670,0irq/47-4a10000011846-21ssh00:14:400
81950670,0irq/46-4a10000020452-21kworker/u2:321:10:210
172592670,0chrt17230-21kworker/u2:220:41:300
158192670,0chrt15706-1kworker/u3:120:32:000
32392660,0chrt3005-21kworker/u2:219:13:030
168242660,0sleep016455-21kworker/u2:320:39:110
81950650,0irq/46-4a1000003006-1kworker/u3:119:16:190
80272650,0chrt7408-21kworker/u2:319:40:370
205842650,0sleep018496-21kworker/u2:422:15:520
81950640,0irq/46-4a1000006942-21ssh21:47:110
81950640,0irq/46-4a10000017389-21ssh00:26:170
82050600,0irq/47-4a10000020453-1kworker/u3:021:06:530
2770995341,0cyclictest81950irq/46-4a10000019:52:540
94750520,0irq/33-mmc010459-1kworker/0:0H20:22:320
81950520,0irq/46-4a1000000-21swapper20:12:200
2770994933,0cyclictest10891-21latency_hist20:00:040
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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