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2026-07-14 - 12:28

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 792 highest latencies:
System rack5slot7s.osadl.org (updated Tue Jul 14, 2026 00:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15874224432204,97sleep00-21swapper19:08:170
161149916617,124cyclictest3216-21munin-run00:20:020
161149916214,108cyclictest21261-21apt-get19:42:020
161149916119,27cyclictest7837-21apt-get21:35:180
161149916111,125cyclictest6245-21/usr/sbin/munin21:25:240
161149916018,117cyclictest24890-21apt-get20:00:250
161149915916,101cyclictest20407-21apt-get22:50:280
161149915915,122cyclictest18972-21apt-get19:25:190
161149915816,27cyclictest29992-21head23:41:090
161149915814,118cyclictest23679-21apt-get23:11:250
161149915720,110cyclictest28276-21apt-get20:20:210
161149915716,116cyclictest16179-21apt-get22:25:280
161149915715,118cyclictest21265-21/usr/sbin/munin19:40:060
161149915619,110cyclictest30158-21apt-get23:45:200
161149915515,21cyclictest11043-21apt-get21:55:200
161149915510,106cyclictest17305-21ntpq19:15:270
161149915422,26cyclictest12784-21systemd-journal20:20:010
161149915419,37cyclictest13792-21df_inode22:10:350
161149915412,119cyclictest12726-21apt-get22:05:250
161149915410,122cyclictest32435-21kworker/u2:300:00:000
161149915410,121cyclictest26261-21grep23:21:380
161149915323,100cyclictest8658-21apt-get21:40:210
161149915320,26cyclictest4480-21users21:11:040
161149915314,95cyclictest29244-21munin-run23:40:030
161149915313,23cyclictest32566-21/usr/sbin/munin00:00:540
161149915310,120cyclictest2024-21grep20:56:030
161149915236,23cyclictest3129-21df21:05:260
161149915217,24cyclictest15194-21munin-run22:20:030
161149915214,97cyclictest6426-21munin-run00:40:020
161149915214,25cyclictest4245-21diskstats00:25:350
161149915213,23cyclictest32141-21users20:41:050
161149915118,108cyclictest17139-21apt-get22:30:260
161149915117,26cyclictest26646-21apt-get20:10:170
161149915115,24cyclictest30835-21irqstats20:35:370
161149915115,23cyclictest1706-21apt-get00:10:200
161149915115,112cyclictest2235-21apt-get21:00:190
161149915114,115cyclictest18459-21sort22:35:590
161149915114,113cyclictest1606-21munin-run00:10:020
161149915112,21cyclictest27229-21sort23:26:070
161149915021,17cyclictest0-21swapper21:20:000
161149915018,25cyclictest22413-21/usr/sbin/munin19:45:300
161149915018,106cyclictest7040-21apt-get21:30:170
161149915016,26cyclictest31058-21df_inode23:50:270
161149915014,23cyclictest10941-21apt21:55:010
161149915014,113cyclictest19766-21apt-get19:30:190
161149915013,27cyclictest32278-21/usr/sbin/munin20:46:000
161149914918,29cyclictest25027-21irqstats23:15:390
161149914918,105cyclictest21373-21apt-get22:55:250
161149914918,103cyclictest23208-21apt-get19:50:200
161149914917,23cyclictest22193-21apt-get23:00:170
161149914912,113cyclictest20242-21munin-run22:50:030
16114991489,99cyclictest12784-21systemd-journal22:25:010
16114991489,115cyclictest9746-21grep21:45:490
161149914815,111cyclictest22988-21apt-get23:05:190
161149914813,111cyclictest16919-21munin-node19:15:070
161149914719,102cyclictest11865-21apt-get22:00:120
161149914715,24cyclictest5225-21/usr/sbin/munin00:30:480
161149914715,107cyclictest29074-21apt-get20:25:200
161149914714,112cyclictest29868-21apt-get20:30:200
161149914711,112cyclictest26272-21grep20:06:040
161149914710,36cyclictest24698-21cron20:00:010
161149914615,108cyclictest18832-21users19:21:050
161149914614,27cyclictest615-21/usr/sbin/munin20:50:440
161149914613,111cyclictest5737-21tr21:20:490
161149914515,105cyclictest27658-21if_eth023:30:360
161149914415,109cyclictest3756-21sendmail_mailqu00:20:540
161149914231,90cyclictest18911-21if_eth022:40:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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