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2026-03-23 - 11:20

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 Mon Mar 23, 2026 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811280,0rcu_preempt3-21ksoftirqd/022:43:040
811240,0rcu_preempt3-21ksoftirqd/023:16:350
811240,0rcu_preempt3-21ksoftirqd/023:16:350
811160,0rcu_preempt3-21ksoftirqd/022:25:470
811150,0rcu_preempt4688-21dropbear19:29:081
811070,0rcu_preempt6312-21dropbear19:34:091
811020,0rcu_preempt3-21ksoftirqd/021:14:120
811020,0rcu_preempt3-21ksoftirqd/021:14:120
81980,0rcu_preempt3-21ksoftirqd/023:22:080
81950,0rcu_preempt3-21ksoftirqd/022:48:520
81890,0rcu_preempt851-21rngd21:45:401
81840,0rcu_preempt3-21ksoftirqd/000:15:470
81830,0rcu_preempt19-21ksoftirqd/123:15:241
81830,0rcu_preempt19-21ksoftirqd/123:15:241
81770,0rcu_preempt19-21ksoftirqd/119:27:461
81720,0rcu_preempt19-21ksoftirqd/123:01:571
81720,0rcu_preempt19-21ksoftirqd/119:22:481
81710,0rcu_preempt851-21rngd23:31:521
81710,0rcu_preempt19-21ksoftirqd/123:10:151
81710,0rcu_preempt19-21ksoftirqd/121:42:211
81690,0rcu_preempt12809-21ssh22:22:311
81680,0rcu_preempt5815-21ntpq21:09:150
81680,0rcu_preempt19-21ksoftirqd/123:45:171
81680,0rcu_preempt19-21ksoftirqd/122:35:011
81670,0rcu_preempt19-21ksoftirqd/119:45:171
81670,0rcu_preempt19-21ksoftirqd/100:29:561
81650,0rcu_preempt19-21ksoftirqd/100:04:021
81650,0rcu_preempt0-21swapper/123:50:421
81650,0rcu_preempt0-21swapper/123:50:421
30178996422,0cyclictest1970-1kworker/0:3H23:26:280
30178996422,0cyclictest12411-1kworker/0:4H00:29:040
10050640,0irq/346-48484003-21ksoftirqd/000:20:490
81630,0rcu_preempt3-21ksoftirqd/021:55:460
30178996319,0cyclictest3626-1kworker/0:0H00:25:560
81620,0rcu_preempt19-21ksoftirqd/123:56:241
81620,0rcu_preempt19-21ksoftirqd/122:52:421
81620,0rcu_preempt0-21swapper/121:38:121
30178996227,0cyclictest8830-1kworker/0:0H22:51:490
30178996223,0cyclictest6994-21apt-get21:44:030
30178996220,0cyclictest13066-1kworker/0:2H21:21:200
30178996220,0cyclictest12411-1kworker/0:4H00:04:490
81610,0rcu_preempt19-21ksoftirqd/121:57:291
81610,0rcu_preempt19-21ksoftirqd/121:51:341
30178996120,0cyclictest18709-1kworker/0:0H23:02:350
30178996119,0cyclictest21408-1kworker/0:0H00:11:340
30178996117,0cyclictest0-21swapper/021:24:090
81600,0rcu_preempt2861-21grep00:24:231
81600,0rcu_preempt19-21ksoftirqd/122:29:141
30178996025,0cyclictest30349-21ssh22:07:290
81590,0rcu_preempt3-21ksoftirqd/022:19:120
81590,0rcu_preempt13868-21ping20:09:031
30178995924,0cyclictest31594-21ssh21:35:220
30178995920,0cyclictest25458-1kworker/0:1H23:45:470
30178995920,0cyclictest24540-1kworker/0:0H21:32:060
30178995919,0cyclictest8830-1kworker/0:0H22:54:160
30178995919,0cyclictest3930-1kworker/0:3H23:10:120
30178995917,0cyclictest0-21swapper/021:50:480
81580,0rcu_preempt19245-21apt-get20:14:030
81580,0rcu_preempt19-21ksoftirqd/122:55:171
81580,0rcu_preempt19-21ksoftirqd/119:04:081
81580,0rcu_preempt0-21swapper/122:24:521
30178995820,0cyclictest21513-1kworker/0:0H22:00:190
30178995819,0cyclictest4523-1kworker/0:3H21:40:590
81570,0rcu_preempt54-21kswapd023:06:580
81570,0rcu_preempt23037-21kworker/0:220:49:040
30178995731,0cyclictest3-21ksoftirqd/019:44:050
30178995719,0cyclictest3929-1kworker/0:0H22:14:520
30178995715,0cyclictest20571-1kworker/0:2H23:40:560
81560,0rcu_preempt7405-1kworker/1:0H21:19:071
81560,0rcu_preempt19-21ksoftirqd/122:15:561
81560,0rcu_preempt19-21ksoftirqd/120:18:091
30178995622,0cyclictest13327-1kworker/0:2H00:36:590
81550,0rcu_preempt19-21ksoftirqd/120:29:201
30178995523,0cyclictest14317-1kworker/0:0H23:33:210
30178995522,0cyclictest2679-1kworker/0:2H23:52:250
30178995522,0cyclictest2679-1kworker/0:2H23:52:250
81540,0rcu_preempt19-21ksoftirqd/121:29:171
81540,0rcu_preempt19-21ksoftirqd/120:24:041
30178995422,0cyclictest2114-21ssh22:11:290
30178995421,0cyclictest25325-21rm22:34:310
30178995420,0cyclictest14167-21latency_hist19:58:530
30178995420,0cyclictest14167-21latency_hist19:58:530
30178995418,0cyclictest0-21swapper/019:28:520
81530,0rcu_preempt3-21ksoftirqd/022:30:420
81530,0rcu_preempt0-21swapper/120:49:101
30178995320,0cyclictest0-21swapper/019:39:070
81520,0rcu_preempt19-21ksoftirqd/122:09:121
81520,0rcu_preempt0-21swapper/100:01:051
81520,0rcu_preempt0-21swapper/100:01:051
30178995222,0cyclictest4766-21diskmemload23:34:130
30178995220,0cyclictest1031-21ping19:18:530
30178995220,0cyclictest1031-21ping19:18:530
81510,0rcu_preempt3-21ksoftirqd/020:04:120
81510,0rcu_preempt0-21swapper/100:37:001
81510,0rcu_preempt0-21swapper/100:13:401
30178995119,0cyclictest0-21swapper/000:00:380
30178995119,0cyclictest0-21swapper/000:00:380
81500,0rcu_preempt3-21ksoftirqd/020:24:140
30178995028,0cyclictest0-21swapper/023:54:130
30178995024,0cyclictest3-21ksoftirqd/019:34:120
30178995020,0cyclictest28732-21taskset20:41:330
81490,0rcu_preempt13868-21ping20:19:061
81490,0rcu_preempt13868-21ping20:04:181
81490,0rcu_preempt0-21swapper/121:12:321
81480,0rcu_preempt19-21ksoftirqd/121:59:381
81480,0rcu_preempt0-21swapper/100:20:531
30178994822,0cyclictest4765-21idleruntime-cro21:08:520
30178994822,0cyclictest32388-21munin-node0
81470,0rcu_preempt3-21ksoftirqd/020:12:350
81470,0rcu_preempt3-21ksoftirqd/020:02:580
81470,0rcu_preempt26387-21meminfo20:34:131
81470,0rcu_preempt25107-21ntp_states00:14:161
81470,0rcu_preempt20225-21kworker/1:223:21:211
81470,0rcu_preempt19-21ksoftirqd/123:39:531
81470,0rcu_preempt19-21ksoftirqd/122:39:041
81470,0rcu_preempt19-21ksoftirqd/121:15:481
81470,0rcu_preempt19-21ksoftirqd/121:15:481
81470,0rcu_preempt0-21swapper/123:26:501
30178994720,0cyclictest5326-21munin-node0
30178994720,0cyclictest28657-1kworker/0:1H20:44:100
81460,0rcu_preempt4766-21diskmemload21:24:031
81460,0rcu_preempt3-21ksoftirqd/019:04:080
81460,0rcu_preempt19-21ksoftirqd/123:04:191
81460,0rcu_preempt19-21ksoftirqd/119:59:201
81460,0rcu_preempt0-21swapper/119:54:181
81460,0rcu_preempt0-21swapper/119:54:181
30178994623,0cyclictest1031-21ping19:19:060
30178994615,0cyclictest0-21swapper/020:19:170
81440,0rcu_preempt54-21kswapd019:49:230
81440,0rcu_preempt19-21ksoftirqd/122:44:071
81440,0rcu_preempt19-21ksoftirqd/119:39:211
30178994417,0cyclictest0-21swapper/020:29:060
13250440,0irq/301-480200015807-1kworker/1:2H23:35:341
81420,0rcu_preempt19-21ksoftirqd/122:06:121
30178994228,0cyclictest31817-21basename19:13:520
30178994228,0cyclictest1762-21munin-node0
81410,0rcu_preempt19-21ksoftirqd/121:04:071
30178994128,0cyclictest26220-21chrt20:34:110
81400,0rcu_preempt19-21ksoftirqd/120:54:151
81400,0rcu_preempt11249-21diskstats19:49:081
81390,0rcu_preempt19-21ksoftirqd/119:18:491
81390,0rcu_preempt19-21ksoftirqd/119:18:491
81380,0rcu_preempt19-21ksoftirqd/120:59:121
81370,0rcu_preempt19-21ksoftirqd/120:44:271
81360,0rcu_preempt27678-21diskstats20:39:071
81350,0rcu_preempt19-21ksoftirqd/119:09:161
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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