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2025-08-30 - 00:45

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 50 highest latencies:
System rack4slot1s.osadl.org (updated Fri Aug 29, 2025 12:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6153998747,29cyclictest55150irq/47-eth010:42:270
6153998747,29cyclictest55150irq/47-eth010:42:270
32082630,2chrt0-21swapper/208:27:402
32082630,2chrt0-21swapper/208:27:402
289312630,2sleep128991-21fschecks_count09:37:311
289312630,2sleep128991-21fschecks_count09:37:311
286852630,3sleep128686-21sh08:12:161
286852630,3sleep128686-21sh08:12:161
213082630,3sleep30-21swapper/312:07:343
213082630,3sleep30-21swapper/312:07:343
615499577,7cyclictest181rcu_preempt09:07:291
615499577,7cyclictest181rcu_preempt09:07:291
6153995735,15cyclictest24567-21kworker/0:3+events_freezable09:32:330
6153995735,15cyclictest24567-21kworker/0:3+events_freezable09:32:330
615499562,12cyclictest181rcu_preempt07:57:301
615499562,12cyclictest181rcu_preempt07:57:301
195242540,3sleep10-21swapper/112:02:341
195242540,3sleep10-21swapper/112:02:341
279402530,2chrt27925-21switchtime09:32:441
279402530,2chrt27925-21switchtime09:32:441
96452510,3sleep1281ktimers/110:12:231
96452510,3sleep1281ktimers/110:12:231
227352490,2chrt22737-21basename10:47:161
227352490,2chrt22737-21basename10:47:161
6153994733,8cyclictest0-21swapper/010:17:310
6153994733,8cyclictest0-21swapper/010:17:310
6153994629,11cyclictest0-21swapper/012:32:270
6153994629,11cyclictest0-21swapper/012:32:270
324202460,3sleep30-21swapper/309:47:183
324202460,3sleep30-21swapper/309:47:183
172912460,3sleep30-21swapper/309:07:173
6153994524,4cyclictest6152-21cyclictest10:37:350
6153994524,4cyclictest6152-21cyclictest10:37:350
6153994520,17cyclictest171ktimers/010:12:260
6153994520,17cyclictest171ktimers/010:12:260
21752440,3sleep30-21swapper/309:52:313
21752440,3sleep30-21swapper/309:52:313
6153994230,8cyclictest0-21swapper/012:27:280
6153994230,8cyclictest0-21swapper/012:27:280
248922420,3sleep30-21swapper/312:17:313
248922420,3sleep30-21swapper/312:17:313
6154994118,19cyclictest281ktimers/111:52:281
6154994118,19cyclictest281ktimers/111:52:281
615399412,31cyclictest394-21snmpd09:22:310
615399412,31cyclictest394-21snmpd09:22:310
6153994017,17cyclictest171ktimers/008:32:290
6153994017,17cyclictest171ktimers/008:32:290
309142400,3sleep20-21swapper/208:17:312
309142400,3sleep20-21swapper/208:17:312
30752400,2sleep13205-21timerandwakeup08:27:401
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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