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2026-06-02 - 23:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot1s.osadl.org (updated Tue Jun 02, 2026 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
292382930,2sleep0171ktimers/011:12:470
292382930,2sleep0171ktimers/011:12:470
130042820,2sleep013001-21latency_hist09:02:500
191892690,1chrt0-21swapper/010:43:040
191892690,1chrt0-21swapper/010:43:040
191892690,1chrt0-21swapper/010:43:040
280772660,2sleep028215-21grep09:42:550
280772660,2sleep028215-21grep09:42:550
280772660,2sleep028215-21grep09:42:550
280772660,2sleep028215-21grep09:42:550
190572620,3sleep20-21swapper/207:52:452
190572620,3sleep20-21swapper/207:52:452
190572620,3sleep20-21swapper/207:52:452
43532610,3sleep00-21swapper/008:38:020
43532610,3sleep00-21swapper/008:38:020
15842560,3chrt0-21swapper/208:32:452
15842560,3chrt0-21swapper/208:32:452
286942530,3sleep128696-21needreboot09:42:591
286942530,3sleep128696-21needreboot09:42:591
286942530,3sleep128696-21needreboot09:42:591
436499510,49cyclictest700-21192.168.115.40-manager08:08:250
436499510,49cyclictest700-21192.168.115.40-manager08:08:250
75702490,3sleep20-21swapper/210:12:592
436499490,3cyclictest700-21192.168.115.40-manager10:31:040
436499490,3cyclictest700-21192.168.115.40-manager10:31:040
436499484,29cyclictest20435-21cat10:47:580
436499481,3cyclictest0-21swapper/012:08:220
436499481,3cyclictest0-21swapper/012:08:220
436499480,2cyclictest700-21192.168.115.40-manager10:37:340
436499480,2cyclictest700-21192.168.115.40-manager10:37:340
436499470,2cyclictest700-21192.168.115.40-manager10:00:120
436499470,2cyclictest700-21192.168.115.40-manager10:00:120
436499470,2cyclictest700-21192.168.115.40-manager10:00:120
436499470,2cyclictest700-21192.168.115.40-manager08:13:440
436499470,2cyclictest700-21192.168.115.40-manager08:13:440
189372470,3sleep30-21swapper/309:17:573
189372470,3sleep30-21swapper/309:17:573
436499461,9cyclictest17274-21taskset12:06:360
436499461,9cyclictest17274-21taskset12:06:360
436499461,9cyclictest17274-21taskset12:06:360
436499461,31cyclictest30860-21chrt11:15:530
436499461,31cyclictest30860-21chrt11:15:530
436499461,31cyclictest30860-21chrt11:15:530
436499460,5cyclictest700-21192.168.115.40-manager09:20:320
436499460,5cyclictest700-21192.168.115.40-manager09:20:320
436499460,4cyclictest700-21192.168.115.40-manager12:25:530
436499460,4cyclictest700-21192.168.115.40-manager12:25:530
436499460,3cyclictest700-21192.168.115.40-manager07:50:570
436499460,3cyclictest700-21192.168.115.40-manager07:50:570
436499460,3cyclictest700-21192.168.115.40-manager07:50:570
436499451,8cyclictest8381-21taskset10:15:420
436499451,8cyclictest749-21runrttasks12:17:110
436499451,8cyclictest749-21runrttasks12:17:110
436499451,2cyclictest700-21192.168.115.40-manager07:40:120
436499451,2cyclictest700-21192.168.115.40-manager07:40:120
436499450,9cyclictest22562-21taskset08:00:470
436499450,9cyclictest22562-21taskset08:00:470
436499450,2cyclictest700-21192.168.115.40-manager11:55:540
436499450,2cyclictest700-21192.168.115.40-manager11:55:540
176072450,2sleep017695-21sendmail_mailqu09:13:040
176072450,2sleep017695-21sendmail_mailqu09:13:040
436499441,8cyclictest749-21runrttasks08:53:210
436499441,8cyclictest749-21runrttasks08:53:210
436499441,7cyclictest10223-21taskset10:20:010
436499441,2cyclictest0-21swapper/011:21:050
436499441,2cyclictest0-21swapper/011:21:050
436499441,11cyclictest8806-21taskset08:49:590
436499441,11cyclictest8806-21taskset08:49:590
436499440,4cyclictest700-21192.168.115.40-manager10:10:140
436499440,4cyclictest700-21192.168.115.40-manager10:10:140
436499440,3cyclictest700-21192.168.115.40-manager11:42:230
436499440,3cyclictest700-21192.168.115.40-manager10:26:340
436499440,3cyclictest700-21192.168.115.40-manager10:26:340
436499440,3cyclictest700-21192.168.115.40-manager10:26:340
436499440,3cyclictest700-21192.168.115.40-manager08:23:440
436499440,3cyclictest700-21192.168.115.40-manager08:23:440
436499440,2cyclictest700-21192.168.115.40-manager09:54:510
436499440,2cyclictest700-21192.168.115.40-manager09:54:510
436499440,2cyclictest700-21192.168.115.40-manager09:54:510
436499431,8cyclictest4471-21seq10:03:360
436499431,8cyclictest4471-21seq10:03:360
436499431,8cyclictest17636-21taskset10:38:540
436499431,8cyclictest17636-21taskset10:38:540
436499431,7cyclictest25763-21chrt09:35:300
436499431,7cyclictest25763-21chrt09:35:300
436499431,7cyclictest25763-21chrt09:35:300
436499431,6cyclictest749-21runrttasks09:09:050
436499431,6cyclictest749-21runrttasks09:09:050
436499431,6cyclictest749-21runrttasks09:09:050
436499431,6cyclictest13263-21seq07:36:310
436499431,6cyclictest13263-21seq07:36:310
436499431,4cyclictest30157-21taskset12:39:180
436499431,4cyclictest30157-21taskset12:39:180
436499431,4cyclictest30157-21taskset12:39:180
436499431,1cyclictest0-21swapper/008:22:450
436499431,1cyclictest0-21swapper/008:22:450
436499430,8cyclictest16810-21taskset07:43:350
436499430,8cyclictest16810-21taskset07:43:350
436499430,7cyclictest26359-21chrt12:28:210
436499430,7cyclictest26359-21chrt12:28:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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