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2026-04-19 - 01:15

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 Sat Apr 18, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17073224362193,98sleep00-21swapper07:06:510
174699917019,127cyclictest32009-21apt-get08:35:140
174699916312,38cyclictest3003-21sed12:11:040
174699916210,109cyclictest31615-21munin-node11:50:110
174699916141,22cyclictest23158-21latency_hist07:40:060
174699916044,22cyclictest26391-21latency_hist08:00:060
174699916018,102cyclictest18509-21munin-node07:15:060
174699915913,118cyclictest4692-21apt-get12:26:310
17469991588,125cyclictest2457-21cut08:50:590
174699915721,30cyclictest10037-21apt-get09:40:320
174699915615,111cyclictest29508-21ntpq11:35:490
17469991558,23cyclictest3589-21find12:15:550
174699915519,107cyclictest7594-21apt-get09:25:160
174699915517,27cyclictest364-21/usr/sbin/munin08:41:070
174699915515,23cyclictest23476-21munin-run11:00:020
174699915418,23cyclictest20269-21munin-run10:40:020
174699915418,111cyclictest9185-21apt-get09:35:210
174699915417,107cyclictest32413-21apt-get11:55:170
174699915416,116cyclictest16775-21apt-get10:21:150
174699915411,119cyclictest25429-21sed07:51:030
174699915410,22cyclictest20500-21wc07:25:050
174699915319,113cyclictest17933-21apt-get10:25:130
174699915318,32cyclictest11941-21diskstats09:50:340
174699915235,95cyclictest30995-21/usr/sbin/munin11:45:390
174699915217,110cyclictest20389-21apt-get10:40:130
174699915216,112cyclictest12524-21apt-get09:56:030
174699915212,40cyclictest21944-21timerwakeupswit07:31:050
174699915212,114cyclictest26521-21awk11:16:020
174699915211,26cyclictest23831-21grep07:41:110
174699915172,55cyclictest24215-21grep11:01:010
174699915134,21cyclictest272-21snmpd09:49:560
174699915115,113cyclictest6512-21apt12:35:000
174699915114,27cyclictest8496-21df_inode09:30:290
174699915114,27cyclictest6797-21/usr/sbin/munin09:20:400
174699915114,114cyclictest31628-21/usr/sbin/munin08:30:560
174699915113,113cyclictest27200-21/usr/sbin/munin08:05:140
174699915112,23cyclictest28898-21df_inode08:15:300
174699915021,104cyclictest27721-21diskstats11:25:300
174699915019,104cyclictest24390-21apt-get11:05:180
174699915017,27cyclictest28170-21irqstats08:10:400
174699915014,23cyclictest7236-21grep12:36:030
174699915014,112cyclictest6076-21diskstats09:15:330
174699915012,112cyclictest3341-21sort08:56:020
174699915011,114cyclictest26774-21ps08:00:540
174699914919,105cyclictest23997-21apt-get07:45:180
174699914917,23cyclictest27473-21users11:21:060
174699914917,106cyclictest28512-21df_inode11:30:270
174699914914,26cyclictest15265-21/usr/sbin/munin10:11:020
174699914913,27cyclictest3949-21grep09:00:540
174699914911,113cyclictest1218-21sshd12:00:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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