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2026-04-08 - 09:34

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 all highest latencies:
System rack5slot7s.osadl.org (updated Wed Apr 08, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3201224402204,93sleep00-21swapper19:07:530
34849917321,28cyclictest8169-21memory19:35:440
34849916820,120cyclictest15102-21apt-get23:30:300
34849916012,124cyclictest15035-21latency_hist23:30:080
34849915934,105cyclictest18714-21tr20:36:280
34849915913,59cyclictest15972-21apt-get23:35:440
34849915817,24cyclictest4289-21munin-node19:15:090
34849915816,120cyclictest11207-21apt-get19:55:280
34849915814,120cyclictest18256-21grep23:45:530
34849915715,115cyclictest10244-21memory23:00:450
34849915614,119cyclictest9879-21apt23:00:000
34849915614,100cyclictest11489-21apt-get23:10:030
34849915515,22cyclictest31431-21apt-get21:55:420
34849915514,113cyclictest31057-21ntpq21:50:490
34849915511,118cyclictest16306-21apt-get20:26:390
34849915413,117cyclictest26358-21zcat21:20:550
34849915412,42cyclictest27312-21wc21:26:020
34849915412,117cyclictest19977-21munin-run20:45:000
34849915410,120cyclictest272-21snmpd22:30:220
34849915322,103cyclictest8754-21apt-get19:40:220
34849915315,19cyclictest12070-21apt-get20:01:150
34849915314,24cyclictest6571-21/usr/sbin/munin19:25:420
34849915313,111cyclictest21662-21/usr/sbin/munin20:55:540
34849915312,118cyclictest11664-21apt-get23:10:260
34849915311,27cyclictest20184-21apt00:00:000
34849915310,100cyclictest5458-21sort19:20:050
34849915220,106cyclictest17436-21apt-get20:30:250
34849915217,37cyclictest16308-21munin-run20:25:020
34849915215,21cyclictest23403-21munin-run00:20:020
34849915215,115cyclictest10241-21apt19:50:020
34849915215,114cyclictest11039-21munin-run19:55:060
34849915215,113cyclictest24120-21sort00:21:090
34849915213,117cyclictest272-21snmpd00:35:380
34849915212,24cyclictest15495-21modprobe20:20:020
34849915212,118cyclictest8749-21grep22:50:530
34849915210,121cyclictest18919-21kworker/u2:1821:00:140
34849915116,37cyclictest5073-21munin-run22:30:010
34849915019,29cyclictest7792-21users19:31:060
34849915019,108cyclictest29022-21apt21:40:010
34849915017,105cyclictest5545-21apt-get19:20:170
34849915016,24cyclictest17271-21irqstats23:40:450
34849915016,111cyclictest2411-21apt-get22:16:180
34849915015,22cyclictest14223-21memory20:10:440
34849915014,108cyclictest7588-21/usr/sbin/munin22:45:220
34849915012,26cyclictest18755-21wc23:50:230
34849915011,25cyclictest14006-21/usr/sbin/munin23:21:000
34849915011,115cyclictest27528-21/usr/sbin/munin21:30:460
34849915010,116cyclictest1726-21grep22:10:210
34849914919,24cyclictest24433-21diskstats00:25:340
34849914918,23cyclictest13332-21munin-run23:20:020
34849914912,22cyclictest7035-21memory22:40:430
34849914912,112cyclictest20868-21/usr/sbin/munin20:50:360
34849914911,23cyclictest20624-21sort20:46:010
34849914911,112cyclictest25716-21unixbench_singl21:16:010
34849914832,22cyclictest24893-21sort21:11:020
34849914821,26cyclictest4278-21apt22:25:010
34849914815,109cyclictest1162-21memory22:05:420
34849914720,101cyclictest21760-21users00:06:060
34849914718,25cyclictest23629-21diskstats21:05:400
34849914714,26cyclictest29379-21/usr/sbin/munin21:40:410
34849914714,112cyclictest13654-21cut20:06:040
3484991468,24cyclictest32210-21kworker/u2:1422:00:180
34849914642,83cyclictest22430-21switchtime00:10:580
34849914613,24cyclictest25219-21df00:30:260
34849914613,108cyclictest20306-21/usr/sbin/munin00:00:400
34849914531,90cyclictest6340-21wc22:35:540
34849914213,27cyclictest30311-21wc21:45:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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