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2026-06-28 - 20:57

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 Sun Jun 28, 2026 12:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1396621000,5sleep113967-21latency_hist10:53:111
1396621000,5sleep113967-21latency_hist10:53:111
154032870,3sleep015404-21grep08:03:170
154032870,3sleep015404-21grep08:03:170
241362820,2sleep10-21swapper/111:18:231
241362820,2sleep10-21swapper/111:18:231
292532790,3chrt0-21swapper/311:33:213
292532790,3chrt0-21swapper/311:33:213
244232760,2sleep00-21swapper/008:28:100
244232760,2sleep00-21swapper/008:28:100
129982730,2chrt12996-21fschecks_time09:23:170
129982730,2chrt12996-21fschecks_time09:23:170
216482720,4sleep10-21swapper/112:38:231
216482720,4sleep10-21swapper/112:38:231
216482720,4sleep10-21swapper/112:38:231
270922690,3chrt0-21swapper/308:33:233
270922690,3chrt0-21swapper/308:33:233
247302640,3sleep30-21swapper/309:53:233
247302640,3sleep30-21swapper/309:53:233
247302640,3sleep30-21swapper/309:53:233
260362620,3sleep30-21swapper/311:23:243
260362620,3sleep30-21swapper/311:23:243
34922610,2sleep30-21swapper/310:23:223
34922610,2sleep30-21swapper/310:23:223
34922610,2sleep30-21swapper/310:23:223
309112600,6sleep030914-21ntp_kernel_pll_08:43:250
309112600,6sleep030914-21ntp_kernel_pll_08:43:250
39722580,3sleep30-21swapper/307:33:183
31002550,2sleep20-21swapper/211:48:272
31002550,2sleep20-21swapper/211:48:272
219222510,3chrt0-21swapper/308:18:283
194712500,1sleep3431rcuc/308:13:213
194712500,1sleep3431rcuc/308:13:213
40832490,2sleep14082-21ntp_kernel_pll_08:58:261
40832490,2sleep14082-21ntp_kernel_pll_08:58:261
40832490,2sleep14082-21ntp_kernel_pll_08:58:261
39832460,3sleep30-21swapper/308:58:243
39832460,3sleep30-21swapper/308:58:243
39832460,3sleep30-21swapper/308:58:243
23212460,1sleep10-21swapper/111:48:181
297592440,1sleep10-21swapper/111:33:271
297592440,1sleep10-21swapper/111:33:271
290542440,3sleep30-21swapper/308:38:303
273102420,3sleep30-21swapper/310:00:313
273102420,3sleep30-21swapper/310:00:313
274102400,2sleep026955-21latency_hist11:28:200
232732400,3sleep30-21swapper/311:18:093
232732400,3sleep30-21swapper/311:18:093
232732400,3sleep30-21swapper/311:18:093
209492390,2sleep10-21swapper/108:18:181
28922993831,5cyclictest27478-21gltestperf11:28:201
188982370,1sleep018999-21memory09:38:220
188982370,1sleep018999-21memory09:38:220
2892299357,5cyclictest281ktimers/108:40:321
28922993531,3cyclictest90-1pr/ttyS011:30:371
28922993531,3cyclictest90-1pr/ttyS011:30:371
28922993531,3cyclictest90-1pr/ttyS009:14:331
28922993531,3cyclictest90-1pr/ttyS009:14:331
28922993530,3cyclictest90-1pr/ttyS008:55:331
28922993530,3cyclictest90-1pr/ttyS008:55:331
28922993530,3cyclictest90-1pr/ttyS008:55:331
28922993527,6cyclictest11955-21kernelversion07:53:201
28922993527,6cyclictest11955-21kernelversion07:53:201
151402350,2sleep115344-21unixbench_singl10:53:281
151402350,2sleep115344-21unixbench_singl10:53:281
151402350,2sleep115344-21unixbench_singl10:53:281
139042350,3sleep30-21swapper/312:18:193
139042350,3sleep30-21swapper/312:18:193
139042350,3sleep30-21swapper/312:18:193
28922993430,3cyclictest90-1pr/ttyS011:01:061
28922993430,3cyclictest90-1pr/ttyS011:01:061
28922993430,3cyclictest90-1pr/ttyS011:01:061
275302340,1sleep10-21swapper/108:33:291
275302340,1sleep10-21swapper/108:33:291
267412340,2sleep026745-21tail08:33:200
267412340,2sleep026745-21tail08:33:200
28922993330,2cyclictest90-1pr/ttyS009:56:341
28922993330,2cyclictest90-1pr/ttyS009:56:341
28922993330,2cyclictest90-1pr/ttyS009:56:341
28922993328,3cyclictest90-1pr/ttyS009:52:341
28922993328,3cyclictest90-1pr/ttyS009:52:341
28922993328,3cyclictest90-1pr/ttyS009:52:341
28922993324,7cyclictest31613-21netstat11:38:231
28922993324,7cyclictest31613-21netstat11:38:231
2892299332,3cyclictest281ktimers/108:31:021
2892299332,3cyclictest281ktimers/108:31:021
183772330,5sleep30-21swapper/308:08:313
183772330,5sleep30-21swapper/308:08:313
28922993226,4cyclictest18905-21latency_hist12:33:061
28922993226,4cyclictest18905-21latency_hist12:33:061
28922993226,4cyclictest18905-21latency_hist12:33:061
28922993226,4cyclictest17248-21fschecks_count08:08:181
28922993226,4cyclictest17248-21fschecks_count08:08:181
28922993224,3cyclictest181rcu_preempt10:12:081
28922993224,3cyclictest181rcu_preempt10:12:081
28922993224,3cyclictest181rcu_preempt10:12:081
2892299317,5cyclictest271rcuc/111:57:371
2892299317,5cyclictest271rcuc/111:57:371
2892299315,24cyclictest281ktimers/111:26:371
28922993125,4cyclictest5184-21apache209:43:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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