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2026-04-28 - 19:45

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 Tue Apr 28, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1390991140,84rtkit-daemon0-21swapper/307:05:163
221471321110,4sleep20-21swapper/208:50:182
218084421070,3sleep33056-21PK-Backend07:15:163
217728027838,13sleep10-21swapper/107:06:041
217723926841,19sleep20-21swapper/207:05:332
217734626344,13sleep00-21swapper/007:06:550
22816462520,6sleep10-21swapper/112:00:201
22079652510,3sleep23056-21PK-Backend08:30:182
22079652510,3sleep23056-21PK-Backend08:30:182
22025022490,5sleep20-21swapper/208:15:182
22445782480,3sleep30-21swapper/310:15:173
22317332470,3sleep03056-21PK-Backend09:40:010
21965402450,4sleep10-21swapper/108:00:131
22415912440,3sleep12241592-21vmstat10:05:241
139099420,5rtkit-daemon2188835-21runrttasks07:39:483
22644252410,3sleep13056-21PK-Backend11:10:191
22286662410,2sleep00-21swapper/009:30:130
22286662410,2sleep00-21swapper/009:30:130
139099400,3rtkit-daemon2204199-21strings08:20:173
139099390,3rtkit-daemon3056-21PK-Backend11:16:503
139099390,3rtkit-daemon3056-21PK-Backend10:06:383
217773299387,18cyclictest2208737-21turbostat08:39:543
2177732993411,20cyclictest436-20systemd-journal11:35:003
2177732993411,20cyclictest436-20systemd-journal11:35:003
217773299319,20cyclictest2182011-21expr07:20:133
2177732993012,16cyclictest2255085-21ntp_kernel_err10:45:193
2177732993010,18cyclictest2178923-21cat07:10:253
217773299300,28cyclictest2235688-21fw_packets09:50:153
217773299291,11cyclictest2226609-21apt09:25:113
217773299290,27cyclictest2251284-21df_inode10:35:143
217773299288,18cyclictest2293620-21cat12:35:143
217773299288,18cyclictest2229081-21ntpq09:30:203
217773299288,18cyclictest2229081-21ntpq09:30:193
217773299286,20cyclictest2291865-21cat12:30:183
217773299283,23cyclictest42-21ksoftirqd/309:49:463
2177732992812,14cyclictest2200560-21open_files08:10:193
2177732992811,15cyclictest978-21snmpd12:07:473
217773299280,26cyclictest2247653-21cat10:25:113
22931832270,3chrt3056-21PK-Backend12:35:001
217773299271,4cyclictest2195170-21memory07:55:163
217773299270,4cyclictest2260946-21rt-features11:00:193
217773299270,3cyclictest2264424-21python311:10:203
217773299270,3cyclictest2253722-21users10:40:223
217773299270,25cyclictest2201768-21/usr/sbin/munin08:15:203
217773299268,16cyclictest1095-21runrttasks10:13:003
217773299267,17cyclictest2285909-21wc12:15:013
217773299267,17cyclictest2262416-21missed_timers11:05:193
217773299266,18cyclictest2275938-21ls11:45:113
217773299261,4cyclictest2215935-21apt08:55:133
217773299260,3cyclictest22468192chrt10:20:343
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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