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2026-06-20 - 00:53

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, 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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack4slot6s.osadl.org (updated Fri Jun 19, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1132823040,3sleep011331-21if_err_eth007:40:140
1789622480,3sleep017897-21uptime12:15:280
2383922150,3sleep023840-21latency_hist10:35:000
1401221340,4chrt13613-21/usr/sbin/munin09:55:250
317421170,3sleep03175-21latency_hist09:15:010
724121110,2sleep07235-21pluginstate07:25:010
1543221060,2sleep015433-21processes07:55:250
268052970,3sleep026803-21awk10:45:190
228902920,4sleep022956-21swap12:35:270
214422900,3sleep021477-21sort08:20:020
221027722,32sleep02219-21df07:05:120
111862700,3sleep011188-21latency_hist07:40:010
50442620,2sleep05046-21grep09:20:270
336599629,21cyclictest8845-21sed07:30:200
3365996230,22cyclictest19264-21runrttasks12:20:420
336599619,18cyclictest7347-21/usr/sbin/munin07:25:230
336599619,18cyclictest4813-21df_inode07:15:140
3365996131,17cyclictest14823-21/usr/sbin/munin12:05:160
3365996034,17cyclictest20428-21/usr/sbin/munin12:25:260
3365996034,16cyclictest26867-21/usr/sbin/munin08:40:180
336599598,16cyclictest25849-21/usr/sbin/munin10:40:280
3365995935,16cyclictest14387-21runrttasks07:50:290
3365995934,17cyclictest30556-21/usr/sbin/munin11:00:150
3365995934,16cyclictest24402-21/usr/sbin/munin08:30:230
3365995933,16cyclictest3621-21/usr/sbin/munin07:10:180
3365995933,16cyclictest13856-21/usr/sbin/munin12:00:260
3365995922,15cyclictest18337-21runrttasks08:05:570
3365995918,13cyclictest19233-21ntpq08:10:210
3365995911,16cyclictest17380-21awk10:10:000
3365995910,17cyclictest29351-21/usr/sbin/munin08:50:140
336599588,17cyclictest23950-21grep10:35:100
336599587,16cyclictest31881-21/usr/sbin/munin09:00:320
3365995834,15cyclictest21633-21/usr/sbin/munin12:30:250
3365995832,17cyclictest8377-21/usr/sbin/munin11:40:130
3365995832,17cyclictest11887-21runrttasks09:47:250
3365995829,19cyclictest0-21swapper11:35:100
3365995826,22cyclictest21756-21runrttasks08:20:200
3365995818,14cyclictest313092chrt08:56:370
3365995810,18cyclictest4502-21/usr/sbin/munin11:25:130
336599579,14cyclictest21675-21ntp_states10:25:230
336599578,16cyclictest1004-21/usr/sbin/munin11:10:250
336599578,15cyclictest18781-21/usr/sbin/munin10:15:260
336599577,18cyclictest3284-21/usr/sbin/munin09:15:140
336599577,16cyclictest31706-21/usr/sbin/munin11:05:230
336599577,16cyclictest28001-21/usr/sbin/munin08:45:240
3365995733,16cyclictest23125-21/usr/sbin/munin08:25:200
3365995733,15cyclictest27966-21/usr/sbin/munin10:50:150
3365995720,14cyclictest29295-21runrttasks10:55:170
3365995711,15cyclictest2997-21munin-run11:20:010
3365995711,14cyclictest12704-21memory07:45:180
336599569,14cyclictest998-21ntp_states09:05:240
336599568,16cyclictest7171-21/usr/sbin/munin09:30:280
336599567,15cyclictest9577-21/usr/sbin/munin11:45:270
336599567,15cyclictest5887-21/usr/sbin/munin09:25:140
3365995632,15cyclictest25926-21/usr/sbin/munin08:35:280
3365995632,15cyclictest16634-21/usr/sbin/munin08:00:190
3365995618,17cyclictest0-21swapper09:53:570
3365995610,32cyclictest17499-21/usr/sbin/munin10:10:160
336599558,16cyclictest114-21systemd-journal10:22:300
336599558,15cyclictest5703-21/usr/sbin/munin11:30:180
336599558,14cyclictest16074-21/usr/sbin/munin12:10:110
336599558,14cyclictest11118-21ntpq11:50:200
3365995532,14cyclictest9958-21/usr/sbin/munin09:40:180
3365995510,13cyclictest12735-21users11:55:280
336599548,14cyclictest14974-21egrep10:00:100
336599547,16cyclictest8454-21/usr/sbin/munin09:35:170
3365995410,14cyclictest3695-21grep11:20:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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