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2026-04-20 - 07:49

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Mon Apr 20, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1836921550,2sleep018368-21sed21:40:030
3173121000,4sleep031787-21switchtime22:30:280
2860921000,4sleep028545-21/usr/sbin/munin00:25:170
147662960,2sleep014764-21ntp_kernel_err21:25:210
247262950,3sleep024767-21latency_hist22:05:020
55702930,4sleep05274-21/usr/sbin/munin22:55:240
313552860,3sleep031405-21sed20:25:010
319222820,2sleep031925-21tr20:25:270
247752820,2sleep024777-21if_eth000:10:160
226722780,2sleep022671-21grep19:50:200
1133427620,32sleep011375-21/usr/sbin/munin19:05:250
11992996316,16cyclictest1919-21/usr/sbin/munin20:35:260
11992996211,17cyclictest7487-21sshd23:02:530
1199299618,19cyclictest25012-21/usr/sbin/munin20:00:150
1199299608,23cyclictest12690-21sshd21:16:550
11992996032,18cyclictest0-21swapper00:30:130
11992996017,11cyclictest288-21snmpd21:41:530
1199299598,17cyclictest11760-21/usr/sbin/munin23:20:240
11992995937,13cyclictest14682-21runrttasks19:20:060
11992995934,16cyclictest6229-21runrttasks20:51:560
11992995934,16cyclictest24922-21/usr/sbin/munin22:05:140
11992995932,17cyclictest29864-21runrttasks22:24:550
11992995922,13cyclictest20423-21runrttasks21:46:410
1199299588,16cyclictest20958-21/usr/sbin/munin21:50:260
1199299588,16cyclictest1427-21/usr/sbin/munin22:40:160
1199299588,15cyclictest27258-21/usr/sbin/munin00:20:210
1199299587,15cyclictest22374-21ntpq00:00:240
11992995835,15cyclictest12654-21/usr/sbin/munin19:10:270
11992995834,14cyclictest23923-21/usr/sbin/munin00:05:290
11992995833,16cyclictest30152-21/usr/sbin/munin22:25:160
11992995833,15cyclictest14508-21/usr/sbin/munin23:30:170
11992995820,13cyclictest276-21runrttasks22:35:320
11992995810,16cyclictest25938-21/usr/sbin/munin00:15:280
11992995810,16cyclictest16779-21munin-plugin-st23:40:000
1199299579,26cyclictest13285-21df21:20:130
1199299579,15cyclictest572-21ntp_states20:30:230
1199299579,15cyclictest3990-21/usr/sbin/munin22:50:300
1199299579,15cyclictest10437-21/usr/sbin/munin23:15:270
1199299577,18cyclictest30069-21runrttasks20:20:010
11992995735,14cyclictest13614-21/usr/sbin/munin23:25:280
11992995734,15cyclictest16201-21/usr/sbin/munin19:25:190
11992995733,15cyclictest4154-21runrttasks20:45:050
11992995732,17cyclictest20828-21/usr/sbin/munin23:55:130
11992995731,16cyclictest26780-21/usr/sbin/munin20:05:270
11992995711,17cyclictest27707-21ntpq22:15:240
11992995710,15cyclictest23758-21df19:55:140
1199299569,12cyclictest8047-21/usr/sbin/munin21:00:210
1199299568,20cyclictest18433-21grep19:35:010
1199299568,16cyclictest13456-21/usr/sbin/munin19:15:130
11992995633,15cyclictest20864-21runrttasks19:43:530
11992995633,14cyclictest27834-21/usr/sbin/munin20:10:190
11992995632,14cyclictest17170-21/usr/sbin/munin23:40:190
11992995624,22cyclictest114-21systemd-journal00:40:000
1199299559,16cyclictest6736-21/usr/sbin/munin20:55:280
1199299558,15cyclictest18590-21df19:35:110
1199299558,14cyclictest288-21snmpd21:31:520
1199299557,15cyclictest8100-21netstat23:05:200
1199299557,15cyclictest10912-21ntp_states21:10:230
11992995533,14cyclictest3973-21runrttasks20:44:310
11992995530,15cyclictest19563-21/usr/sbin/munin23:50:140
11992995529,16cyclictest18722-21/usr/sbin/munin23:45:270
11992995510,17cyclictest9413-21awk23:10:190
1199299547,14cyclictest37532chrt22:49:090
11992995431,15cyclictest26368-21/usr/sbin/munin22:10:190
11992995431,14cyclictest21522-21/usr/sbin/munin19:45:240
11992995410,15cyclictest23472-21cat22:00:020
1199299537,15cyclictest9335-21/usr/sbin/munin21:05:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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