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2026-06-21 - 08:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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.
Unexpectedly long latencies may be caused by SMIs
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 rackcslot7s.osadl.org (updated Sun Jun 21, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
308688021290,4sleep23056-21PK-Backend19:30:002
308505521100,3sleep33056-21PK-Backend19:25:003
307876927740,31sleep00-21swapper/019:08:460
307884427144,18sleep10-21swapper/119:09:441
307814127149,13sleep30-21swapper/319:05:243
307884026746,14sleep20-21swapper/219:09:412
30997272400,2sleep30-21swapper/320:05:153
31384812270,4chrt3056-21PK-Backend21:55:201
139099260,4rtkit-daemon1389-21rtkit-daemon00:28:430
307918999257,15cyclictest3165772-21unin-run23:15:001
3079182992517,6cyclictest3121858-21cron21:10:000
31590172230,7sleep234-21ksoftirqd/222:55:032
3079189992316,5cyclictest3107727-21idleruntime-cro20:30:001
3079189992314,7cyclictest3128398-21sshd21:25:231
31800582220,8sleep126-21ksoftirqd/123:55:001
3079194992220,1cyclictest0-21swapper/319:43:383
3079194992219,2cyclictest3056-21PK-Backend19:26:213
307919499220,20cyclictest3056-21PK-Backend21:22:533
307919499220,20cyclictest3056-21PK-Backend21:22:533
307919499220,20cyclictest3056-21PK-Backend21:05:173
3079191992220,1cyclictest0-21swapper/221:45:542
3079191992220,1cyclictest0-21swapper/221:05:102
3079191992220,1cyclictest0-21swapper/221:03:212
3079191992220,1cyclictest0-21swapper/200:18:222
3079191992220,1cyclictest0-21swapper/200:13:432
3079191992217,3cyclictest436-20systemd-journal23:34:322
3079191992216,5cyclictest3118331-21pool-whoopsie20:59:292
3079189992211,9cyclictest3151364-21unin-run22:34:591
307918999220,20cyclictest3080632-21taskset19:10:581
3079182992213,7cyclictest3176403-21cron23:44:590
307918299220,21cyclictest0-21swapper/021:37:010
139099220,13rtkit-daemon0-21swapper/019:52:130
31677222210,5sleep342-21ksoftirqd/323:20:113
31677222210,5sleep342-21ksoftirqd/323:20:113
3079194992119,1cyclictest3056-21PK-Backend23:12:103
3079194992119,1cyclictest3056-21PK-Backend21:02:333
3079194992119,1cyclictest3056-21PK-Backend20:53:063
3079194992119,1cyclictest0-21swapper/321:56:413
3079194992119,1cyclictest0-21swapper/321:47:413
3079194992119,1cyclictest0-21swapper/321:30:253
3079194992119,1cyclictest0-21swapper/319:31:143
3079194992119,1cyclictest0-21swapper/300:06:183
3079194992118,2cyclictest3056-21PK-Backend20:32:113
307919499211,17cyclictest3079474-21apt19:10:113
307919499210,20cyclictest3056-21PK-Backend20:38:333
307919499210,20cyclictest3056-21PK-Backend19:55:203
307919499210,20cyclictest0-21swapper/300:16:463
307919499210,19cyclictest3056-21PK-Backend23:38:403
307919499210,19cyclictest3056-21PK-Backend23:09:553
307919499210,19cyclictest3056-21PK-Backend22:51:363
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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