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2026-04-10 - 14:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot6s.osadl.org (updated Fri Apr 10, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
166132099758,21cyclictest1673953-21/usr/sbin/munin20:20:181
166132099758,21cyclictest1673953-21/usr/sbin/munin20:20:181
166131799686,15cyclictest1705075-21apt-get23:25:010
1661320996611,46cyclictest24-21ksoftirqd/121:50:171
1661321996256,4cyclictest311ktimers/221:50:002
1661320995937,10cyclictest231ktimers/123:45:021
166132199583,28cyclictest0-21swapper/219:55:012
166131799581,45cyclictest0-21swapper/022:15:120
166132199563,30cyclictest0-21swapper/221:45:022
166132199563,30cyclictest0-21swapper/221:45:022
166131799532,14cyclictest1708632-21munin-plugin-st23:45:000
1661317995234,15cyclictest167350irq/118-8000000.ethernet-tx022:20:180
1661321995138,8cyclictest1694010-21sendmail22:20:002
1661320995115,15cyclictest22-21rcuc/100:25:011
166132199502,16cyclictest30-21rcuc/220:30:022
1661320995033,11cyclictest231ktimers/122:00:141
1661317994941,4cyclictest167350irq/118-8000000.ethernet-tx000:24:590
1661317994931,15cyclictest167350irq/118-8000000.ethernet-tx019:45:230
1661321994835,9cyclictest0-21swapper/222:50:292
1661320994838,5cyclictest1678750-21unixbench_singl20:45:291
1661320994835,8cyclictest22-21rcuc/121:15:011
166132099482,12cyclictest24-21ksoftirqd/121:05:011
166132099482,12cyclictest24-21ksoftirqd/121:05:011
166131799487,3cyclictest0-21swapper/022:05:190
1661321994739,5cyclictest1685563-21munin-plugin-st21:30:012
1661320994727,14cyclictest231ktimers/100:15:121
1661317994736,6cyclictest0-21swapper/019:10:180
166131799473,31cyclictest0-21swapper/020:35:000
166132199461,6cyclictest0-21swapper/220:55:012
166132199461,25cyclictest0-21swapper/220:55:012
166132099466,17cyclictest24-21ksoftirqd/123:40:001
1661317994639,4cyclictest1682895-21threads21:10:290
166131799462,5cyclictest274-21systemd-journal20:35:160
1661320994537,5cyclictest1677116-21munin-plugin-st20:40:001
1661317994531,11cyclictest0-21swapper/023:57:140
166131799452,9cyclictest0-21swapper/022:40:020
1661317994529,14cyclictest167350irq/118-8000000.ethernet-tx021:35:280
166132199446,5cyclictest0-21swapper/222:05:022
1661321994435,5cyclictest0-21swapper/220:29:592
1661321994433,6cyclictest1710397-21cat23:55:002
1661320994432,7cyclictest1686349-21grep21:30:301
1661320994429,9cyclictest0-21swapper/123:25:211
166131799441,6cyclictest0-21swapper/019:30:000
1661317994414,19cyclictest12-21ksoftirqd/019:40:010
1661320994331,8cyclictest0-21swapper/119:25:281
1661320994327,10cyclictest0-21swapper/122:55:191
166132099432,15cyclictest24-21ksoftirqd/120:45:001
1661317994335,4cyclictest167350irq/118-8000000.ethernet-tx021:50:160
166131799432,38cyclictest0-21swapper/023:10:210
1661321994234,4cyclictest1673667-21apt-get20:20:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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