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2025-11-02 - 15:59

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 376 highest latencies:
System rack9slot8s.osadl.org (updated Sun Nov 02, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819502370,0irq/47-4a10000022820-1kworker/u3:207:06:340
81950900,0irq/47-4a10000018641-21rm11:45:320
81850850,0irq/46-4a10000026076-21ssh12:01:310
81850840,0irq/46-4a10000028887-21runrttasks09:49:470
81850840,0irq/46-4a10000018679-21ssh09:28:090
81950830,0irq/47-4a1000001432-21ssh11:09:090
102392830,0chrt9863-21kworker/u2:111:27:380
81850820,0irq/46-4a1000008794-21seq11:24:380
81850820,0irq/46-4a10000021321-21runrttasks09:33:460
81850820,0irq/46-4a10000010021-21ssh10:18:260
123702826,0sleep012390-21ssh09:14:570
81850800,0irq/46-4a10000015829-21ssh10:30:410
81950790,0irq/47-4a1000008355-21ssh10:14:580
81950790,0irq/47-4a1000004141-21rm10:05:330
81850790,0irq/46-4a1000007140-21ssh12:30:220
81850790,0irq/46-4a10000026946-21ssh10:54:420
81850790,0irq/46-4a10000023502-21ssh10:47:120
81850790,0irq/46-4a10000014898-21ssh09:20:020
81950780,0irq/47-4a10000031835-21munin-run11:04:570
81950780,0irq/47-4a10000030557-21sshd09:53:140
81950780,0irq/47-4a10000020098-21sendmail-msp10:39:570
81850780,0irq/46-4a1000002795-21ssh11:11:570
81850780,0irq/46-4a10000024490-21ssh09:40:160
81850780,0irq/46-4a10000011813-21ssh10:22:110
315092780,0chrt31072-21kworker/u2:107:57:270
81950770,0irq/47-4a1000003438-21ssh10:04:290
81950770,0irq/47-4a1000001602-21apt08:14:530
81850770,0irq/46-4a1000003785-21chrt08:27:550
81850770,0irq/46-4a10000028531-21kworker/u2:112:15:030
81850770,0irq/46-4a1000002660-21ssh12:20:460
81850770,0irq/46-4a10000013930-21ssh10:26:420
257012770,0chrt24331-21kworker/u2:507:18:230
209682770,0chrt2568-21kworker/u2:011:50:310
102982770,0chrt2813-21kworker/u2:512:37:140
81950760,0irq/47-4a1000004788-21latency_hist08:34:530
81950760,0irq/47-4a10000015964-21latency_hist11:40:030
81850760,0irq/46-4a1000002474-21apt-config08:19:580
68122760,0chrt6502-21kworker/u2:408:48:270
57332760,0chrt5198-21kworker/u2:012:27:270
54822760,0sleep04354-21kworker/u2:608:39:480
162752760,0chrt14630-21kworker/u2:611:40:250
81950750,0irq/47-4a1000009890-21sshd09:09:280
81950750,0irq/47-4a10000029415-21idleruntime-cro10:59:580
81950750,0irq/47-4a10000029324-21sshd12:08:330
81950750,0irq/47-4a10000024736-21/usr/sbin/munin07:14:530
81850750,0irq/46-4a1000004986-21kworker/u2:111:16:580
81850750,0irq/46-4a10000031891-21ssh09:55:570
81850750,0irq/46-4a10000020901-21ssh10:41:340
87872740,0sleep07249-21kworker/u2:209:01:260
81950740,0irq/47-4a1000009518-21kworker/u2:009:17:110
81950740,0irq/47-4a10000028531-21kworker/u2:112:17:570
81950740,0irq/47-4a10000023914-21ssh09:39:170
81850740,0irq/46-4a10000011803-21ssh11:30:560
308962740,0chrt30671-21kworker/u2:007:53:270
57802730,0chrt4354-21kworker/u2:608:41:020
295542730,0chrt29177-21kworker/u2:607:44:290
233182730,0chrt18968-21kworker/u2:111:55:330
81950720,0irq/47-4a1000007293-21sshd08:51:260
81950720,0irq/47-4a10000028562-21runrttasks07:37:330
81950720,0irq/47-4a10000028123-21munin-run07:34:520
262422720,0sleep025495-21kworker/u2:107:21:360
81950710,0irq/47-4a1000008025-21sshd08:56:260
81950710,0irq/47-4a10000030037-21sshd07:47:250
20572710,0chrt1873-21kworker/u2:608:17:360
273452700,0sleep025495-21kworker/u2:107:29:380
81950690,0irq/47-4a10000030671-21kworker/u2:008:09:530
24013994934,0cyclictest32137-21runrttasks08:01:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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