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2026-05-12 - 20:30

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 May 12, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
179010921340,3sleep30-21swapper/311:45:013
170521521290,4sleep13056-21PK-Backend07:40:181
17088892990,4sleep33056-21PK-Backend07:50:223
16925642770,6sleep1251rcuc/107:05:291
139099740,61rtkit-daemon0-21swapper/007:06:330
169290226343,14sleep30-21swapper/307:08:503
169286426343,14sleep20-21swapper/207:08:192
16939342540,2sleep03056-21PK-Backend07:10:180
17416492490,4sleep33056-21PK-Backend09:25:193
17473102460,3sleep20-21swapper/209:40:212
17160442460,4sleep013-21ksoftirqd/008:10:370
17253742330,1sleep00-21swapper/008:40:120
139099310,4rtkit-daemon1389-21rtkit-daemon11:32:452
139099310,4rtkit-daemon1389-21rtkit-daemon11:32:442
139099290,4rtkit-daemon1389-21rtkit-daemon11:45:242
169315899286,10cyclictest1709480-21munin-run07:55:012
169315899285,11cyclictest1740691-21systemctl09:25:002
169315899276,8cyclictest1707140-21python307:45:222
169315899275,9cyclictest1710605-21python307:55:212
169315899275,8cyclictest1760526-21apt10:20:102
1693158992711,14cyclictest1798695-21turbostat12:10:002
139099270,4rtkit-daemon1389-21rtkit-daemon12:04:273
169315899265,8cyclictest1736316-21memory09:10:192
169315899264,9cyclictest1717645-21timerandwakeup08:15:232
169315899263,13cyclictest0-21swapper/210:10:142
169315899255,11cyclictest0-21swapper/209:35:512
169315899254,8cyclictest0-21swapper/210:40:182
139099250,4rtkit-daemon1389-21rtkit-daemon08:40:172
169315899243,9cyclictest1793738-21/usr/sbin/munin11:55:212
139099240,16rtkit-daemon3056-21PK-Backend07:11:381
169315899239,12cyclictest436-20systemd-journal11:37:372
169315899237,14cyclictest1721682-21wc08:30:012
1693158992311,10cyclictest1765704-21find10:35:132
169315899231,10cyclictest0-21swapper/209:56:162
1693158992310,11cyclictest1755454-21cpuspeed_turbos10:05:142
169315399230,22cyclictest0-21swapper/008:15:140
139099230,4rtkit-daemon1389-21rtkit-daemon08:18:563
17564172220,4sleep00-21swapper/010:05:240
169316399222,18cyclictest1791404-21package-data-do11:45:363
1693163992220,1cyclictest0-21swapper/312:07:473
1693163992220,1cyclictest0-21swapper/311:33:403
1693163992220,1cyclictest0-21swapper/311:33:403
1693163992220,1cyclictest0-21swapper/310:33:573
1693163992219,2cyclictest3056-21PK-Backend09:14:163
1693163992216,4cyclictest436-20systemd-journal08:49:553
169315899228,6cyclictest1807371-21latency_hist12:35:002
169315899227,12cyclictest1748640-21kernelversion09:45:162
169315899223,8cyclictest0-21swapper/210:30:202
1693158992210,11cyclictest883-21dbus-daemon12:05:002
169315899220,21cyclictest0-21swapper/209:09:572
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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