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2026-06-08 - 00:50

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 100 highest latencies:
System rackaslot5s.osadl.org (updated Sun Jun 07, 2026 12:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811230,0rcu_preempt19-21ksoftirqd/112:22:491
81930,0rcu_preempt19-21ksoftirqd/110:58:061
91840,0rcu_sched3-21ksoftirqd/012:36:070
81770,0rcu_preempt3-21ksoftirqd/011:12:570
81770,0rcu_preempt3-21ksoftirqd/008:47:190
81740,0rcu_preempt13442-1kworker/0:3H09:52:550
81730,0rcu_preempt32571-21ssh11:37:400
81730,0rcu_preempt3-21ksoftirqd/011:38:050
81720,0rcu_preempt3-21ksoftirqd/010:02:540
81710,0rcu_preempt3-21ksoftirqd/009:25:050
81700,0rcu_preempt3-21ksoftirqd/012:11:060
81690,0rcu_preempt3-21ksoftirqd/010:48:020
81690,0rcu_preempt31750-1kworker/0:2H09:27:400
81690,0rcu_preempt23133-21ping08:22:490
81670,0rcu_preempt3-21ksoftirqd/011:01:040
81670,0rcu_preempt13942-21diskmemload09:18:050
81660,0rcu_preempt3-21ksoftirqd/011:54:540
81660,0rcu_preempt3-21ksoftirqd/009:48:390
81660,0rcu_preempt19-21ksoftirqd/110:17:581
81650,0rcu_preempt22065-21df_inode07:52:540
81650,0rcu_preempt22065-21df_inode07:52:540
6927996524,0cyclictest10208-21ping07:27:000
81640,0rcu_preempt3-21ksoftirqd/011:22:580
6927996423,0cyclictest3127-21apt-get11:07:510
6927996421,0cyclictest6476-21apt-get09:32:500
81630,0rcu_preempt3-21ksoftirqd/010:18:160
81630,0rcu_preempt15635-21sendmail-mta10:23:401
6927996325,0cyclictest13942-21diskmemload11:47:500
81610,0rcu_preempt3-21ksoftirqd/009:12:590
81610,0rcu_preempt27006-21diskstats08:07:550
6927996118,0cyclictest0-21swapper/010:33:030
6927996116,0cyclictest0-21swapper/010:54:540
6927996116,0cyclictest0-21swapper/009:40:070
81600,0rcu_preempt4960-21ps08:38:030
81600,0rcu_preempt19-21ksoftirqd/108:16:391
81600,0rcu_preempt12663-21diskstats09:02:540
6927996025,0cyclictest16662-21seq09:42:550
6927996024,0cyclictest28335-21apt-get10:27:490
180432600,0chrt10050irq/346-484840007:38:290
81590,0rcu_preempt8921-21diskstats07:12:550
81590,0rcu_preempt3-21ksoftirqd/008:22:390
6927995920,0cyclictest0-21swapper/012:17:500
6927995917,0cyclictest0-21swapper/012:24:350
81580,0rcu_preempt23133-21ping07:57:400
81580,0rcu_preempt19-21ksoftirqd/109:33:051
6927995823,0cyclictest30593-21apt-get11:02:510
81570,0rcu_preempt3-21ksoftirqd/008:12:400
81570,0rcu_preempt19-21ksoftirqd/108:48:041
6927995722,0cyclictest31208-21apt-get09:57:490
6927995722,0cyclictest25501-1kworker/0:1H10:24:200
6927995721,0cyclictest5359-21cut11:42:510
6927995717,0cyclictest0-21swapper/011:32:220
81560,0rcu_preempt3-21ksoftirqd/012:03:040
81560,0rcu_preempt3-21ksoftirqd/008:02:530
81560,0rcu_preempt19-21ksoftirqd/111:18:071
81560,0rcu_preempt19-21ksoftirqd/111:16:201
81560,0rcu_preempt19-21ksoftirqd/111:04:351
81560,0rcu_preempt19-21ksoftirqd/110:06:171
81560,0rcu_preempt19-21ksoftirqd/109:14:431
81560,0rcu_preempt19-21ksoftirqd/108:12:111
6927995620,0cyclictest6506-21ssh12:16:390
6927995620,0cyclictest6506-21ssh12:16:390
6927995617,0cyclictest0-21swapper/010:12:430
6927995616,0cyclictest0-21swapper/010:07:470
81550,0rcu_preempt19-21ksoftirqd/112:33:421
81550,0rcu_preempt19-21ksoftirqd/111:44:581
81550,0rcu_preempt19-21ksoftirqd/108:28:061
81550,0rcu_preempt19-21ksoftirqd/108:03:091
81550,0rcu_preempt19-21ksoftirqd/107:12:391
6927995522,0cyclictest14537-21fw_packets09:07:560
6927995522,0cyclictest0-21swapper/008:48:020
81540,0rcu_preempt3-21ksoftirqd/011:59:280
81540,0rcu_preempt3-21ksoftirqd/011:18:060
81540,0rcu_preempt3-21ksoftirqd/008:57:540
81540,0rcu_preempt3-21ksoftirqd/008:57:540
81540,0rcu_preempt19-21ksoftirqd/112:18:341
81540,0rcu_preempt19-21ksoftirqd/112:09:071
81540,0rcu_preempt19-21ksoftirqd/112:00:081
81540,0rcu_preempt19-21ksoftirqd/110:52:571
81540,0rcu_preempt19-21ksoftirqd/109:32:351
81540,0rcu_preempt19-21ksoftirqd/108:18:091
81540,0rcu_preempt19-21ksoftirqd/107:57:561
81540,0rcu_preempt19-21ksoftirqd/107:43:141
81540,0rcu_preempt10208-21ping07:27:580
6927995424,0cyclictest30451-1kworker/0:2H10:37:400
6927995422,0cyclictest11743-21sh10:43:060
6927995420,0cyclictest14831-1kworker/0:0H12:27:450
81530,0rcu_preempt3-21ksoftirqd/007:07:390
81530,0rcu_preempt19-21ksoftirqd/112:05:301
81530,0rcu_preempt19-21ksoftirqd/111:49:471
81530,0rcu_preempt19-21ksoftirqd/110:17:281
81520,0rcu_preempt3-21ksoftirqd/008:32:570
81520,0rcu_preempt3-21ksoftirqd/007:36:420
81520,0rcu_preempt19-21ksoftirqd/109:54:441
81520,0rcu_preempt19-21ksoftirqd/109:43:411
81520,0rcu_preempt19-21ksoftirqd/108:23:011
81510,0rcu_preempt3-21ksoftirqd/008:52:500
81510,0rcu_preempt19-21ksoftirqd/110:44:551
81510,0rcu_preempt19-21ksoftirqd/110:41:331
81510,0rcu_preempt19-21ksoftirqd/110:27:401
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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