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2026-01-07 - 16:53

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 Wed Jan 07, 2026 12:43:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
811590,0rcu_preempt19-21ksoftirqd/107:31:351
811490,0rcu_preempt19-21ksoftirqd/107:35:011
811350,0rcu_preempt19-21ksoftirqd/107:45:201
811340,0rcu_preempt19-21ksoftirqd/107:25:251
811220,0rcu_preempt3-21ksoftirqd/009:13:340
811220,0rcu_preempt24881-21ping07:30:040
811130,0rcu_preempt19-21ksoftirqd/107:22:251
811130,0rcu_preempt19-21ksoftirqd/107:22:251
811100,0rcu_preempt28104-21kworker/0:112:15:050
811100,0rcu_preempt14763-21dropbear09:29:591
811090,0rcu_preempt24881-21ping07:40:050
811090,0rcu_preempt12777-21kworker/0:109:32:340
811060,0rcu_preempt19-21ksoftirqd/107:40:051
811030,0rcu_preempt3-21ksoftirqd/011:49:580
811020,0rcu_preempt3-21ksoftirqd/011:14:460
811010,0rcu_preempt19-21ksoftirqd/110:32:231
811000,0rcu_preempt31247-21kworker/1:011:54:191
81980,0rcu_preempt0-21swapper/010:58:480
81960,0rcu_preempt3-21ksoftirqd/011:29:590
81960,0rcu_preempt3-21ksoftirqd/009:37:330
81960,0rcu_preempt19-21ksoftirqd/109:13:111
81940,0rcu_preempt3-21ksoftirqd/007:47:300
81940,0rcu_preempt19-21ksoftirqd/109:35:151
81930,0rcu_preempt19-21ksoftirqd/112:09:411
81920,0rcu_preempt19-21ksoftirqd/109:29:191
81920,0rcu_preempt19-21ksoftirqd/108:59:461
81910,0rcu_preempt3-21ksoftirqd/012:39:460
81910,0rcu_preempt3-21ksoftirqd/008:55:150
81900,0rcu_preempt3-21ksoftirqd/011:04:590
81900,0rcu_preempt3-21ksoftirqd/010:25:180
81900,0rcu_preempt3-21ksoftirqd/008:04:460
81900,0rcu_preempt19-21ksoftirqd/111:59:361
81900,0rcu_preempt19-21ksoftirqd/110:14:361
81890,0rcu_preempt3-21ksoftirqd/009:19:590
81890,0rcu_preempt19-21ksoftirqd/111:37:111
81890,0rcu_preempt19-21ksoftirqd/111:37:111
81890,0rcu_preempt19-21ksoftirqd/111:28:341
81890,0rcu_preempt19-21ksoftirqd/111:28:341
81890,0rcu_preempt19-21ksoftirqd/111:11:581
81890,0rcu_preempt19-21ksoftirqd/110:39:521
81890,0rcu_preempt19-21ksoftirqd/110:01:011
81890,0rcu_preempt19-21ksoftirqd/108:39:541
81880,0rcu_preempt19-21ksoftirqd/112:34:321
81880,0rcu_preempt19-21ksoftirqd/112:27:041
81880,0rcu_preempt19-21ksoftirqd/111:31:121
81880,0rcu_preempt19-21ksoftirqd/111:18:131
81880,0rcu_preempt19-21ksoftirqd/111:06:161
81880,0rcu_preempt19-21ksoftirqd/108:05:031
81870,0rcu_preempt3-21ksoftirqd/010:39:160
81870,0rcu_preempt3-21ksoftirqd/010:00:140
81870,0rcu_preempt19-21ksoftirqd/111:49:021
81870,0rcu_preempt19-21ksoftirqd/111:03:221
81870,0rcu_preempt19-21ksoftirqd/110:23:301
81870,0rcu_preempt19-21ksoftirqd/110:23:301
81870,0rcu_preempt19-21ksoftirqd/108:37:101
81860,0rcu_preempt3-21ksoftirqd/008:30:110
81860,0rcu_preempt19-21ksoftirqd/109:45:211
81860,0rcu_preempt19-21ksoftirqd/109:06:041
81860,0rcu_preempt19-21ksoftirqd/109:01:271
81860,0rcu_preempt19-21ksoftirqd/107:12:241
81850,0rcu_preempt19-21ksoftirqd/112:22:541
81850,0rcu_preempt19-21ksoftirqd/112:13:101
81850,0rcu_preempt19-21ksoftirqd/110:07:281
81840,0rcu_preempt3-21ksoftirqd/011:25:080
81840,0rcu_preempt3-21ksoftirqd/011:25:080
81840,0rcu_preempt3-21ksoftirqd/010:52:580
81840,0rcu_preempt3-21ksoftirqd/010:45:180
81840,0rcu_preempt3-21ksoftirqd/010:40:170
81840,0rcu_preempt3-21ksoftirqd/008:45:140
81840,0rcu_preempt19-21ksoftirqd/109:40:551
81840,0rcu_preempt19-21ksoftirqd/109:24:171
81840,0rcu_preempt19-21ksoftirqd/109:17:501
81840,0rcu_preempt19-21ksoftirqd/107:53:341
81830,0rcu_preempt3-21ksoftirqd/007:35:170
81830,0rcu_preempt19-21ksoftirqd/112:38:051
81830,0rcu_preempt19-21ksoftirqd/110:56:371
81830,0rcu_preempt19-21ksoftirqd/110:48:381
81830,0rcu_preempt19-21ksoftirqd/109:56:301
81820,0rcu_preempt3-21ksoftirqd/008:20:150
81820,0rcu_preempt19-21ksoftirqd/110:51:031
81810,0rcu_preempt3-21ksoftirqd/007:09:460
81810,0rcu_preempt19-21ksoftirqd/112:02:111
81810,0rcu_preempt19-21ksoftirqd/110:28:301
81810,0rcu_preempt19-21ksoftirqd/109:49:531
81800,0rcu_preempt3-21ksoftirqd/009:39:530
81800,0rcu_preempt3-21ksoftirqd/009:15:000
81800,0rcu_preempt19-21ksoftirqd/111:23:471
81800,0rcu_preempt19-21ksoftirqd/110:35:371
81800,0rcu_preempt19-21ksoftirqd/108:24:521
81800,0rcu_preempt12196-21kworker/0:112:28:450
81790,0rcu_preempt3-21ksoftirqd/012:10:020
81790,0rcu_preempt3-21ksoftirqd/011:45:460
81790,0rcu_preempt3-21ksoftirqd/007:09:470
81790,0rcu_preempt19-21ksoftirqd/111:44:171
81790,0rcu_preempt0-21swapper/112:18:041
81780,0rcu_preempt3-21ksoftirqd/012:20:140
81780,0rcu_preempt19-21ksoftirqd/107:14:511
81780,0rcu_preempt15246-21ssh12:30:160
81770,0rcu_preempt3-21ksoftirqd/011:19:500
81770,0rcu_preempt3-21ksoftirqd/011:18:010
81770,0rcu_preempt3-21ksoftirqd/008:05:140
81760,0rcu_preempt3-21ksoftirqd/011:00:010
81760,0rcu_preempt28596-21diskmemload10:30:150
81750,0rcu_preempt3-21ksoftirqd/009:48:020
81750,0rcu_preempt3-21ksoftirqd/009:24:500
81750,0rcu_preempt28596-21diskmemload10:10:120
81740,0rcu_preempt3-21ksoftirqd/012:09:040
81730,0rcu_preempt3-21ksoftirqd/011:55:510
81730,0rcu_preempt28596-21diskmemload09:55:090
81720,0rcu_preempt3-21ksoftirqd/011:59:580
81720,0rcu_preempt3-21ksoftirqd/011:34:560
81720,0rcu_preempt3-21ksoftirqd/011:34:560
81720,0rcu_preempt3-21ksoftirqd/010:15:010
81710,0rcu_preempt3-21ksoftirqd/007:20:110
81710,0rcu_preempt3-21ksoftirqd/007:20:110
81700,0rcu_preempt54-21kswapd008:15:000
81700,0rcu_preempt3-21ksoftirqd/009:51:220
81690,0rcu_preempt54-21kswapd008:25:120
81690,0rcu_preempt3-21ksoftirqd/011:41:220
81690,0rcu_preempt3-21ksoftirqd/010:07:290
81690,0rcu_preempt3-21ksoftirqd/008:34:460
81690,0rcu_preempt3-21ksoftirqd/007:55:150
81670,0rcu_preempt3-21ksoftirqd/010:23:290
81670,0rcu_preempt3-21ksoftirqd/010:23:290
81670,0rcu_preempt3-21ksoftirqd/008:10:080
81670,0rcu_preempt3-21ksoftirqd/008:10:080
81660,0rcu_preempt19-21ksoftirqd/107:59:591
81650,0rcu_preempt3-21ksoftirqd/009:05:070
81650,0rcu_preempt3-21ksoftirqd/007:50:040
81640,0rcu_preempt20608-1kworker/1:2H10:15:141
81620,0rcu_preempt3-21ksoftirqd/008:44:460
81620,0rcu_preempt22448-21php-cgi08:50:031
81620,0rcu_preempt19-21ksoftirqd/108:30:041
81610,0rcu_preempt3-21ksoftirqd/009:00:040
81580,0rcu_preempt3-21ksoftirqd/008:49:580
81560,0rcu_preempt19-21ksoftirqd/108:10:041
81560,0rcu_preempt19-21ksoftirqd/108:10:041
81550,0rcu_preempt5288-1kworker/1:2H07:59:461
81550,0rcu_preempt3-21ksoftirqd/007:15:100
81520,0rcu_preempt3-21ksoftirqd/007:25:150
81500,0rcu_preempt19-21ksoftirqd/108:20:101
81480,0rcu_preempt19-21ksoftirqd/108:45:131
81460,0rcu_preempt19-21ksoftirqd/108:16:041
81410,0rcu_preempt19617-1kworker/1:5H07:06:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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