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2026-04-24 - 07:18

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #5

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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rackaslot5s.osadl.org (updated Fri Apr 24, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811050,0rcu_preempt19-21ksoftirqd/122:48:481
10050800,0irq/346-48484006307-1kworker/0:2H00:21:390
10050770,0irq/346-48484006307-1kworker/0:2H00:26:430
10050760,0irq/346-484840054-21kswapd023:53:440
10050760,0irq/346-484840054-21kswapd023:10:160
10050760,0irq/346-484840054-21kswapd023:00:100
10050760,0irq/346-484840054-21kswapd000:09:460
10050760,0irq/346-484840054-21kswapd000:09:460
81750,0rcu_preempt3-21ksoftirqd/000:28:470
10050750,0irq/346-48484006741-1kworker/0:0H22:11:460
10050750,0irq/346-484840054-21kswapd023:19:080
229099741,0cyclictest1768-1kworker/0:3H22:06:570
10050740,0irq/346-484840054-21kswapd021:38:450
10050740,0irq/346-484840020423-1kworker/0:3H00:35:370
10050740,0irq/346-484840013277-1kworker/0:2H22:50:250
10050730,0irq/346-484840026618-1kworker/0:0H00:14:140
10050730,0irq/346-484840019207-1kworker/0:2H21:47:000
10050720,0irq/346-48484004063-1kworker/0:1H23:49:480
10050720,0irq/346-484840017432-1kworker/0:0H23:33:090
229099711,0cyclictest21091-21apt-get00:03:330
10050710,0irq/346-4848400851-21rngd21:54:380
10050710,0irq/346-4848400851-21rngd21:54:380
10050710,0irq/346-484840023524-1kworker/0:1H23:37:120
10050710,0irq/346-484840013779-1kworker/0:1H21:16:230
10050700,0irq/346-484840026579-1kworker/0:0H22:34:080
229099692,0cyclictest19207-1kworker/0:2H21:31:050
229099692,0cyclictest1470-21runrttasks22:27:480
10050690,0irq/346-48484004343-1kworker/0:3H21:37:110
10050690,0irq/346-48484004343-1kworker/0:3H21:37:110
229099652,0cyclictest22470-21ssh21:21:090
229099651,0cyclictest11522-1kworker/0:1H23:23:450
81640,0rcu_preempt3-21ksoftirqd/021:08:400
81640,0rcu_preempt16915-21ssh22:53:420
10050640,0irq/346-484840012476-1kworker/0:1H22:22:070
81630,0rcu_preempt9204-21apt-get22:13:350
229099632,0cyclictest6598-21ssh22:43:350
229099632,0cyclictest28725-21munin-run22:33:220
229099632,0cyclictest1324-21ssh23:43:310
81620,0rcu_preempt19-21ksoftirqd/122:15:401
229099621,0cyclictest29011-1kworker/0:0H23:07:230
229099612,0cyclictest29109-21php-cgi23:38:390
229099612,0cyclictest25041-21taskset20:16:120
229099611,0cyclictest16163-21apt-get23:58:340
229099611,0cyclictest1297-1kworker/0:1H22:41:370
229099608,0cyclictest27179-21runrttasks21:25:510
229099608,0cyclictest27179-21runrttasks21:25:510
229099602,0cyclictest7443-21taskset21:01:250
229099602,0cyclictest4331-1kworker/0:1H20:53:380
229099602,0cyclictest21468-21ssh21:53:210
229099601,0cyclictest7970-21dropbear21:03:360
81590,0rcu_preempt3-21ksoftirqd/019:53:450
229099592,0cyclictest25596-21sh20:18:370
229099592,0cyclictest21971-1kworker/0:0H20:08:330
229099591,0cyclictest29872-1kworker/0:3H20:33:390
229099591,0cyclictest29872-1kworker/0:3H20:33:390
81580,0rcu_preempt19698-21grep19:58:500
229099581,0cyclictest0-21swapper/022:00:250
81570,0rcu_preempt19-21ksoftirqd/120:18:231
2290995716,0cyclictest3884-21munin-node0
81560,0rcu_preempt27266-21diskstats20:23:390
229099554,0cyclictest0-21swapper/019:38:220
229099553,0cyclictest20876-21munin-node0
229099552,0cyclictest1754-21sed20:43:440
229099552,0cyclictest0-21swapper/019:48:330
2290995515,0cyclictest0-21swapper/020:39:160
2290995515,0cyclictest0-21swapper/020:30:040
81540,0rcu_preempt19-21ksoftirqd/120:13:221
229099545,0cyclictest5570-21ping19:23:500
229099542,0cyclictest5570-21ping19:43:330
229099541,0cyclictest5570-21ping19:38:340
81530,0rcu_preempt3-21ksoftirqd/019:03:410
81530,0rcu_preempt19-21ksoftirqd/123:43:511
81530,0rcu_preempt19-21ksoftirqd/121:14:211
229099531,0cyclictest5570-21ping19:28:330
229099531,0cyclictest0-21swapper/019:13:370
81520,0rcu_preempt9269-21diskmemload23:23:391
229099521,0cyclictest5570-21ping19:18:310
81510,0rcu_preempt19-21ksoftirqd/119:43:521
10050510,0irq/346-484840013560-1kworker/1:0H23:30:351
81500,0rcu_preempt19-21ksoftirqd/121:58:331
81500,0rcu_preempt19129-21kworker/1:019:23:561
229099502,0cyclictest0-21swapper/019:08:370
9950490,0irq/345-48484006308-1kworker/1:0H00:24:471
81490,0rcu_preempt19-21ksoftirqd/121:04:491
229099491,0cyclictest2854-21apt-get20:48:320
81480,0rcu_preempt7386-1kworker/1:0H21:43:351
81480,0rcu_preempt19-21ksoftirqd/120:13:381
81480,0rcu_preempt16546-21idleruntime23:58:421
81470,0rcu_preempt9269-21diskmemload21:18:421
81470,0rcu_preempt19-21ksoftirqd/121:23:381
81470,0rcu_preempt19-21ksoftirqd/121:23:381
10050470,0irq/346-484840019-21ksoftirqd/121:31:091
81460,0rcu_preempt9269-21diskmemload23:36:181
81460,0rcu_preempt4931-21timerandwakeup19:13:481
81460,0rcu_preempt22693-21ssh22:58:521
81460,0rcu_preempt19-21ksoftirqd/123:49:341
81460,0rcu_preempt19-21ksoftirqd/122:25:031
81460,0rcu_preempt19-21ksoftirqd/121:53:361
81460,0rcu_preempt19-21ksoftirqd/121:53:361
81460,0rcu_preempt19-21ksoftirqd/119:28:551
81460,0rcu_preempt19-21ksoftirqd/100:28:491
10050460,0irq/346-484840031572-1kworker/1:1H22:47:251
10050460,0irq/346-48484000-21swapper/122:56:091
81450,0rcu_preempt19-21ksoftirqd/123:09:211
81450,0rcu_preempt19-21ksoftirqd/122:18:531
81450,0rcu_preempt19-21ksoftirqd/122:03:331
81450,0rcu_preempt19-21ksoftirqd/121:48:491
81450,0rcu_preempt19-21ksoftirqd/121:38:541
81450,0rcu_preempt19-21ksoftirqd/119:58:391
81450,0rcu_preempt19129-21kworker/1:021:38:171
81450,0rcu_preempt19129-21kworker/1:021:38:171
81440,0rcu_preempt9269-21diskmemload23:40:401
81440,0rcu_preempt9269-21diskmemload21:08:291
81440,0rcu_preempt9269-21diskmemload00:06:501
81440,0rcu_preempt19-21ksoftirqd/123:58:051
81440,0rcu_preempt19-21ksoftirqd/123:04:361
81440,0rcu_preempt19-21ksoftirqd/122:33:251
81440,0rcu_preempt19-21ksoftirqd/122:28:461
81440,0rcu_preempt19-21ksoftirqd/119:18:481
81440,0rcu_preempt19-21ksoftirqd/100:33:261
81440,0rcu_preempt19-21ksoftirqd/100:15:541
81440,0rcu_preempt13289-21kworker/u4:123:18:471
10050440,0irq/346-4848400851-21rngd00:09:151
10050440,0irq/346-4848400851-21rngd00:09:151
81430,0rcu_preempt5570-21ping19:38:321
81430,0rcu_preempt19-21ksoftirqd/122:12:151
81430,0rcu_preempt19-21ksoftirqd/119:33:431
81430,0rcu_preempt19-21ksoftirqd/100:20:511
81420,0rcu_preempt19-21ksoftirqd/122:38:501
81420,0rcu_preempt19-21ksoftirqd/120:03:511
81410,0rcu_preempt0-21swapper/120:53:401
81400,0rcu_preempt19-21ksoftirqd/123:13:311
81400,0rcu_preempt19-21ksoftirqd/120:23:361
81400,0rcu_preempt19-21ksoftirqd/119:08:371
81400,0rcu_preempt0-21swapper/119:48:331
81390,0rcu_preempt19-21ksoftirqd/120:43:501
81390,0rcu_preempt0-21swapper/119:58:231
81380,0rcu_preempt19-21ksoftirqd/120:48:321
81380,0rcu_preempt19-21ksoftirqd/120:33:391
81380,0rcu_preempt19-21ksoftirqd/120:33:391
81380,0rcu_preempt19-21ksoftirqd/120:33:231
81370,0rcu_preempt19-21ksoftirqd/120:58:411
81370,0rcu_preempt19-21ksoftirqd/120:38:461
81370,0rcu_preempt19-21ksoftirqd/119:05:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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