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2026-08-10 - 18:52

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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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 100 highest latencies:
System rackaslot5s.osadl.org (updated Mon Aug 10, 2026 12:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811030,0rcu_preempt19-21ksoftirqd/111:12:571
811000,0rcu_preempt19-21ksoftirqd/111:26:391
811000,0rcu_preempt19-21ksoftirqd/107:10:591
81970,0rcu_preempt54-21kswapd012:19:501
81940,0rcu_preempt19-21ksoftirqd/110:17:411
81910,0rcu_preempt19-21ksoftirqd/110:57:161
10050830,0irq/346-4848400111rcuc/011:11:270
81810,0rcu_preempt19-21ksoftirqd/109:46:461
81770,0rcu_preempt3-21ksoftirqd/009:53:500
81760,0rcu_preempt3-21ksoftirqd/012:25:010
81750,0rcu_preempt3-21ksoftirqd/012:33:280
13250750,0irq/301-480200054-21kswapd011:50:030
81740,0rcu_preempt3-21ksoftirqd/011:59:360
81730,0rcu_preempt3-21ksoftirqd/010:03:000
81730,0rcu_preempt3-21ksoftirqd/009:14:520
81730,0rcu_preempt3-21ksoftirqd/009:11:340
81720,0rcu_preempt3-21ksoftirqd/012:00:380
81720,0rcu_preempt3-21ksoftirqd/011:16:070
81720,0rcu_preempt3-21ksoftirqd/010:39:540
81710,0rcu_preempt19-21ksoftirqd/111:20:261
81700,0rcu_preempt3-21ksoftirqd/012:36:280
81700,0rcu_preempt3-21ksoftirqd/012:36:280
81700,0rcu_preempt3-21ksoftirqd/012:18:250
81700,0rcu_preempt3-21ksoftirqd/012:12:090
81700,0rcu_preempt3-21ksoftirqd/011:26:520
81700,0rcu_preempt3-21ksoftirqd/010:57:380
81700,0rcu_preempt3-21ksoftirqd/010:22:320
81690,0rcu_preempt3-21ksoftirqd/010:25:300
81690,0rcu_preempt3-21ksoftirqd/009:47:070
81690,0rcu_preempt3-21ksoftirqd/009:34:200
81680,0rcu_preempt3-21ksoftirqd/011:40:430
81680,0rcu_preempt3-21ksoftirqd/011:37:040
81680,0rcu_preempt3-21ksoftirqd/011:37:040
81680,0rcu_preempt3-21ksoftirqd/011:19:560
81680,0rcu_preempt3-21ksoftirqd/009:42:500
81680,0rcu_preempt10314-1kworker/1:1H09:58:241
81670,0rcu_preempt3-21ksoftirqd/012:09:050
81670,0rcu_preempt3-21ksoftirqd/010:10:450
81660,0rcu_preempt3-21ksoftirqd/010:52:280
81660,0rcu_preempt19-21ksoftirqd/110:27:301
81660,0rcu_preempt19-21ksoftirqd/109:20:051
2142299661,0cyclictest29817-1kworker/0:0H10:19:450
2142299642,0cyclictest24699-21ping07:30:060
81630,0rcu_preempt19-21ksoftirqd/107:57:331
81630,0rcu_preempt19-21ksoftirqd/107:57:331
81620,0rcu_preempt5639-1kworker/1:1H11:39:511
81610,0rcu_preempt3-21ksoftirqd/008:09:500
2142299611,0cyclictest6646-21diskstats11:00:050
2142299611,0cyclictest11975-21/usr/sbin/munin08:19:500
2142299611,0cyclictest11975-21/usr/sbin/munin08:19:500
21422996014,0cyclictest0-21swapper/009:57:310
81590,0rcu_preempt19-21ksoftirqd/110:37:561
2142299592,0cyclictest24699-21ping07:40:010
2142299591,0cyclictest0-21swapper/011:49:210
10050590,0irq/346-484840028091-1kworker/0:1H09:20:410
81580,0rcu_preempt19-21ksoftirqd/110:44:341
21422995814,0cyclictest0-21swapper/010:06:380
2142299581,0cyclictest0-21swapper/011:05:580
9950570,0irq/345-48484002142399cyclictest11:38:151
9950570,0irq/345-48484002142399cyclictest11:38:151
81570,0rcu_preempt9347-21kworker/0:210:35:440
81570,0rcu_preempt3-21ksoftirqd/009:35:330
81570,0rcu_preempt0-21swapper/108:25:021
2142299572,0cyclictest24699-21ping07:20:010
10050570,0irq/346-4848400181ktimersoftd/110:04:411
81560,0rcu_preempt19-21ksoftirqd/109:19:491
2142299565,0cyclictest0-21swapper/007:59:510
2142299562,0cyclictest24699-21ping07:28:220
2142299562,0cyclictest24699-21ping07:28:220
21422995613,0cyclictest0-21swapper/010:31:360
2142299561,0cyclictest0-21swapper/012:23:080
81540,0rcu_preempt5180-21kworker/1:008:16:361
81540,0rcu_preempt5180-21kworker/1:008:16:361
81540,0rcu_preempt19-21ksoftirqd/112:34:571
81540,0rcu_preempt19-21ksoftirqd/112:34:571
81540,0rcu_preempt19-21ksoftirqd/111:15:131
9950530,0irq/345-48484000-21swapper/007:05:010
81530,0rcu_preempt19-21ksoftirqd/110:52:251
81530,0rcu_preempt0-21swapper/112:34:131
81510,0rcu_preempt5181-21ping08:05:191
81510,0rcu_preempt5067-21dropbear12:05:051
81510,0rcu_preempt19-21ksoftirqd/110:04:501
81510,0rcu_preempt19-21ksoftirqd/109:35:581
81500,0rcu_preempt3-21ksoftirqd/009:25:020
81500,0rcu_preempt3-21ksoftirqd/008:23:350
81500,0rcu_preempt19-21ksoftirqd/108:00:181
81490,0rcu_preempt3-21ksoftirqd/007:57:550
81490,0rcu_preempt3-21ksoftirqd/007:57:550
81490,0rcu_preempt19-21ksoftirqd/111:32:081
81490,0rcu_preempt19-21ksoftirqd/111:32:081
81490,0rcu_preempt19-21ksoftirqd/107:45:111
2142299491,0cyclictest24699-21ping07:39:500
10050490,0irq/346-48484005640-1kworker/0:2H11:33:020
10050490,0irq/346-48484005640-1kworker/0:2H11:33:020
81480,0rcu_preempt5181-21ping08:25:140
81480,0rcu_preempt3-21ksoftirqd/009:00:110
81480,0rcu_preempt3-21ksoftirqd/008:14:240
81480,0rcu_preempt3-21ksoftirqd/008:14:240
81480,0rcu_preempt24699-21ping07:45:180
81480,0rcu_preempt19-21ksoftirqd/107:05:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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