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2026-04-10 - 04:07

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 100 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
1661321994226,12cyclictest0-21swapper/200:35:232
166132199421,10cyclictest30-21rcuc/221:15:022
1661320994229,9cyclictest0-21swapper/123:55:281
1661320994227,10cyclictest0-21swapper/121:15:271
166132099421,4cyclictest0-21swapper/122:55:011
1661317994237,4cyclictest0-21swapper/022:55:140
1661317994236,3cyclictest167350irq/118-8000000.ethernet-tx000:15:150
1661317994234,4cyclictest0-21swapper/020:25:210
1661317994232,5cyclictest20850irq/208-8000000.ethernet22:25:300
166131799421,3cyclictest0-21swapper/000:25:110
166132099417,6cyclictest1671036-21apt-get20:05:011
1661320994133,5cyclictest1710310-21munin-plugin-st23:55:001
1661320994129,7cyclictest0-21swapper/121:20:291
1661320994124,10cyclictest0-21swapper/122:35:011
166132099411,4cyclictest0-21swapper/120:55:021
166131799414,31cyclictest1702482-21sed23:05:280
1661317994133,5cyclictest1712925-21cron00:10:000
1661317994132,6cyclictest0-21swapper/021:55:130
1661317994125,14cyclictest0-21swapper/020:05:040
166131799412,4cyclictest1687533-21diskstats21:40:190
166131799412,4cyclictest1687533-21diskstats21:40:180
166131799412,4cyclictest1674004-21cpu20:20:160
166131799412,4cyclictest1674004-21cpu20:20:160
166131799411,4cyclictest1677383-21grep20:40:140
166131799411,4cyclictest1664046-21grep19:20:280
166131799411,38cyclictest0-21swapper/023:25:220
1661321994030,5cyclictest0-21swapper/223:14:592
1661321994024,10cyclictest0-21swapper/219:15:202
1661321994023,8cyclictest0-21swapper/222:05:292
1661320994028,7cyclictest1695745-21grep22:25:301
1661320994028,6cyclictest0-21swapper/121:55:271
1661320994026,9cyclictest231ktimers/122:45:131
1661320994026,7cyclictest0-21swapper/119:20:291
1661317994033,4cyclictest1699154-21cron22:50:000
1661317994033,4cyclictest0-21swapper/023:45:210
166131799402,3cyclictest1688606-21memory21:45:270
166131799401,5cyclictest1667007-21diskstats19:40:180
166131799401,4cyclictest1693157-21munin-run22:15:000
166131799401,36cyclictest0-21swapper/023:54:150
166132199396,15cyclictest30-21rcuc/221:05:012
166132199396,15cyclictest30-21rcuc/221:05:012
166132199395,18cyclictest1668483-21find19:50:002
1661321993924,10cyclictest0-21swapper/223:35:022
166132099393,2cyclictest0-21swapper/120:00:001
1661320993929,5cyclictest0-21swapper/119:15:011
1661320993928,6cyclictest0-21swapper/123:40:211
1661320993924,8cyclictest1717898-21unixbench_multi00:35:271
166132099391,32cyclictest1706205-21/usr/sbin/munin23:30:231
1661317993932,4cyclictest0-21swapper/019:20:000
166131799391,2cyclictest0-21swapper/021:00:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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