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2026-06-01 - 07:24

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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.
Unexpectedly long latencies may be caused by SMIs
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 50 highest latencies:
System rack1slot6s.osadl.org (updated Mon Jun 01, 2026 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14990999624,10cyclictest1227-21runrttasks23:07:483
1499099954,25cyclictest0-21swapper/323:47:013
14990999519,16cyclictest19805-21open_inodes21:22:333
1499099944,29cyclictest0-21swapper/300:17:313
1499099944,29cyclictest0-21swapper/300:17:313
1499099925,76cyclictest0-21swapper/323:47:363
14990999210,24cyclictest0-21swapper/300:07:093
1499099905,77cyclictest0-21swapper/323:53:183
1499099905,29cyclictest0-21swapper/319:52:083
1499099903,13cyclictest17572-21ssh00:32:323
1499099894,75cyclictest0-21swapper/319:27:403
1499099894,75cyclictest0-21swapper/319:27:403
219499880,5rtkit-daemon2193-21rtkit-daemon22:57:193
219499880,5rtkit-daemon2193-21rtkit-daemon22:57:193
1499099889,11cyclictest656-21latency21:42:293
1499099886,28cyclictest0-21swapper/323:38:103
1499099886,28cyclictest0-21swapper/323:38:103
1499099879,11cyclictest9412-21cpuspeed_turbos00:22:133
14990998725,54cyclictest0-21swapper/319:32:233
14990998714,64cyclictest0-21swapper/322:12:363
14990998714,12cyclictest0-21swapper/321:48:463
1499099864,30cyclictest0-21swapper/322:42:173
1499099864,29cyclictest0-21swapper/320:07:343
1499099864,27cyclictest0-21swapper/322:07:303
14990998636,43cyclictest4744-21cpuspeed_turbos19:52:223
1499099863,25cyclictest0-21swapper/323:22:273
14990998628,50cyclictest11186-21unixbench_singl23:32:343
14990998625,52cyclictest18675-21latency19:12:363
14990998623,13cyclictest0-21swapper/319:57:433
14990998615,24cyclictest0-21swapper/321:56:293
14990998613,10cyclictest28003-21ssh22:22:303
167412850,3sleep3361ktimersoftd/319:07:403
1499099856,25cyclictest0-21swapper/300:03:203
1499099855,25cyclictest0-21swapper/322:27:063
1499099854,73cyclictest0-21swapper/321:27:223
14990998531,46cyclictest5318-21crond21:02:063
14990998521,56cyclictest28831-21cpu21:37:183
14990998521,56cyclictest28831-21cpu21:37:183
219499840,4rtkit-daemon2193-21rtkit-daemon19:39:573
1499099847,10cyclictest107550irq/46-eth000:12:163
1499099845,28cyclictest0-21swapper/320:22:213
1499099844,72cyclictest0-21swapper/321:59:363
1499099844,31cyclictest28877-21fschecks_time23:12:193
1499099844,15cyclictest0-21swapper/321:02:363
14990998426,11cyclictest29977-21unixbench_multi20:42:413
14990998417,10cyclictest23799-21df_abs22:17:183
14990998417,10cyclictest23799-21df_abs22:17:183
14989998431,45cyclictest773-21taskset00:08:012
1499099836,10cyclictest107550irq/46-eth022:37:043
1499099834,20cyclictest24506-21ssh23:07:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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