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2026-05-28 - 07:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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.

Total number of samples: 50.5 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 rack5slot7s.osadl.org (updated Thu May 28, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19691224442211,88sleep00-21swapper19:09:340
197839916250,86cyclictest23662-21latency_hist19:30:060
197839916216,123cyclictest22508-21munin-run22:40:030
197839916034,105cyclictest31813-21apt20:20:020
197839915919,25cyclictest26198-21diskstats19:45:330
197839915917,117cyclictest16284-21ntp_states22:00:500
197839915914,27cyclictest28605-21munin-run20:00:010
197839915815,118cyclictest20803-21apt-get22:30:250
197839915612,122cyclictest7776-21wc00:26:070
197839915612,120cyclictest2287-21df23:55:250
197839915516,22cyclictest9543-21munin-run00:40:020
197839915513,100cyclictest30086-21memory23:25:430
197839915511,31cyclictest32261-21/usr/sbin/munin20:21:020
197839915511,120cyclictest6102-21apt-get00:21:300
197839915476,56cyclictest778-21wc20:25:420
197839915441,93cyclictest12456-21switchtime21:36:010
197839915417,109cyclictest13552-21apt-get21:45:170
197839915414,116cyclictest29254-21sort20:01:080
197839915412,118cyclictest1512-21apt-get20:30:280
197839915410,23cyclictest18820-21mailstats22:15:590
197839915410,119cyclictest5289-21sh00:15:010
197839915319,27cyclictest17557-21apt-get22:10:190
197839915315,113cyclictest9429-21munin-run21:20:030
197839915313,110cyclictest9546-21/usr/sbin/munin21:20:110
197839915311,116cyclictest5391-21/usr/sbin/munin00:15:120
19783991529,121cyclictest32465-21cat23:40:400
197839915216,115cyclictest11379-21memory21:30:430
197839915213,25cyclictest20591-21munin-node19:15:040
197839915212,25cyclictest24655-21awk22:50:550
197839915120,27cyclictest8028-21df_inode21:10:290
197839915119,106cyclictest4118-21ntp_states00:05:500
197839915119,104cyclictest4716-21apt-get20:50:170
197839915117,25cyclictest21115-21df19:15:420
197839915115,113cyclictest4150-21sort20:45:410
197839915114,107cyclictest22944-21ntpq22:40:500
197839915111,117cyclictest10342-21/usr/sbin/munin21:25:090
197839915111,115cyclictest8045-21/usr/sbin/munin00:30:110
197839915111,114cyclictest25378-21expr19:40:240
19783991509,116cyclictest23510-21cstates22:45:230
197839915022,23cyclictest22544-21kworker/u2:419:30:200
197839915021,28cyclictest24572-21df_inode19:35:300
197839915017,29cyclictest29519-21apt-get20:05:190
197839915015,111cyclictest15303-21/usr/sbin/munin21:55:370
197839915014,16cyclictest0-21swapper21:04:010
197839915011,26cyclictest30421-21df_inode20:10:290
197839915011,117cyclictest26610-21grep23:05:050
19783991499,115cyclictest17537-21cat22:10:060
197839914919,28cyclictest28330-21diskstats23:15:330
197839914916,21cyclictest32140-21munin-run23:40:020
197839914915,22cyclictest7822-21munin-run21:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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