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2026-01-11 - 13:02

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 Sun Jan 11, 2026 00:44:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16812900,3sleep10-21swapper/119:46:371
16812900,3sleep10-21swapper/119:46:371
271512810,3chrt27154-21needreboot20:55:441
271512810,3chrt27154-21needreboot20:55:441
283102700,1sleep3431rcuc/321:00:363
283102700,1sleep3431rcuc/321:00:363
74232670,3sleep10-21swapper/121:30:411
74232670,3sleep10-21swapper/121:30:411
84072650,1sleep30-21swapper/320:05:443
69502650,3sleep10-21swapper/121:29:501
69502650,3sleep10-21swapper/121:29:501
302132540,2sleep20-21swapper/223:55:512
302132540,2sleep20-21swapper/223:55:512
302132540,2sleep20-21swapper/223:55:512
19866995041,6cyclictest0-21swapper/000:00:420
19866995041,6cyclictest0-21swapper/000:00:420
7252490,3sleep30-21swapper/319:45:423
7252490,3sleep30-21swapper/319:45:423
19866994940,6cyclictest0-21swapper/000:00:340
19866994940,6cyclictest0-21swapper/000:00:340
19866994940,6cyclictest0-21swapper/000:00:340
134822490,2chrt0-21swapper/300:40:393
134822490,2chrt0-21swapper/300:40:393
240432450,3sleep10-21swapper/120:45:551
240432450,3sleep10-21swapper/120:45:551
19866994135,4cyclictest13595-21fschecks_count20:20:410
19866994135,4cyclictest13595-21fschecks_count20:20:410
146222400,3chrt0-21swapper/323:15:443
146222400,3chrt0-21swapper/323:15:443
1986999381,27cyclictest30845-21chrt00:00:353
1986999381,27cyclictest30845-21chrt00:00:353
1986999381,27cyclictest30845-21chrt00:00:353
300962370,2sleep30-21swapper/322:30:413
300962370,2sleep30-21swapper/322:30:413
1986799373,29cyclictest31031-21df_inode00:00:401
1986799373,29cyclictest31031-21df_inode00:00:401
19867993731,4cyclictest25969-21ntp_kernel_pll_19:25:461
19867993731,4cyclictest25969-21ntp_kernel_pll_19:25:461
194942370,3sleep20-21swapper/220:35:422
194942370,3sleep20-21swapper/220:35:422
154762360,3sleep20-21swapper/220:25:412
300502350,5sleep130211-21unixbench-2d23:55:511
19867993520,2cyclictest181rcu_preempt21:50:521
19866993527,6cyclictest1041-21netstat19:45:460
19866993527,6cyclictest1041-21netstat19:45:460
19867993424,7cyclictest18618-21fschecks_count22:00:411
19867993424,7cyclictest18618-21fschecks_count22:00:411
176772340,2sleep10-21swapper/123:25:311
176772340,2sleep10-21swapper/123:25:311
57752330,2sleep30-21swapper/320:00:303
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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