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2026-07-02 - 07:20

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 Thu Jul 02, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
22790224552211,98sleep00-21swapper19:06:060
232739916415,45cyclictest14695-21apt-get21:30:270
232739916114,120cyclictest24503-21apt-get19:15:350
232739916114,119cyclictest3754-21/usr/sbin/munin23:40:450
232739916113,124cyclictest27569-21wc22:45:550
232739915833,22cyclictest12788-21/usr/sbin/munin21:20:320
232739915817,117cyclictest20581-21df22:05:240
232739915816,25cyclictest3146-21sort23:35:410
232739915811,125cyclictest26944-21sshd19:30:090
232739915738,99cyclictest21858-21timerwakeupswit22:11:000
232739915718,99cyclictest31485-21diskstats23:10:300
232739915716,39cyclictest26224-21apt22:40:010
232739915715,118cyclictest2134-21munin-node23:30:110
232739915617,39cyclictest19103-21memory21:55:450
232739915617,24cyclictest12908-21diskstats00:35:310
232739915614,120cyclictest7890-21apt-get00:05:210
232739915516,25cyclictest28864-21munin-run19:40:020
232739915516,23cyclictest24081-21munin-node19:15:090
232739915514,119cyclictest17382-21diskstats21:45:320
232739915514,117cyclictest6844-21munin-run00:00:020
232739915512,22cyclictest28004-21apt-get22:50:260
232739915511,31cyclictest12817-21apt-get21:20:110
23273991549,120cyclictest32171-21apt-get23:15:130
232739915419,25cyclictest25447-21diskstats19:20:320
232739915415,26cyclictest22131-21/usr/sbin/munin22:15:220
232739915414,117cyclictest24397-21munin-run22:30:010
232739915414,115cyclictest5625-21/usr/sbin/munin20:35:220
232739915413,115cyclictest5968-21sed23:51:010
232739915412,118cyclictest2418-21df_inode20:15:490
232739915411,122cyclictest28602-21kworker/u2:1322:55:150
23273991539,120cyclictest15199-1kworker/u3:021:35:160
232739915317,97cyclictest26827-21munin-run19:30:010
232739915317,110cyclictest10287-21munin-run21:05:010
232739915315,23cyclictest9010-21memory20:55:450
232739915312,28cyclictest32299-21/usr/sbin/munin20:00:360
232739915310,120cyclictest13838-21apt-get21:25:190
232739915219,26cyclictest24395-21apt-get22:31:090
232739915214,24cyclictest10290-21munin-run00:20:020
232739915213,115cyclictest3547-21wc20:21:010
232739915120,105cyclictest4664-21diskstats23:45:340
232739915113,25cyclictest16477-21/usr/sbin/munin21:40:590
232739915113,116cyclictest4567-21sort20:26:010
232739915112,27cyclictest1341-21apt-get23:25:100
23273991509,42cyclictest31588-21wc19:55:410
232739915012,112cyclictest7868-21modprobe20:50:010
232739914934,91cyclictest12651-21sed00:31:020
232739914914,28cyclictest6961-21/usr/sbin/munin00:00:400
232739914911,113cyclictest11055-21awk21:06:060
232739914910,24cyclictest20197-21sort22:00:560
232739914822,98cyclictest6497-21diskstats20:40:330
232739914818,26cyclictest30681-21diskstats19:50:350
232739914815,108cyclictest544-21/usr/sbin/munin23:20:340
232739914814,108cyclictest11317-21diskstats00:25:330
232739914812,38cyclictest7660-1kworker/u3:300:10:210
23273991479,23cyclictest11874-21latency_hist21:15:010
232739914715,48cyclictest10523-21diskstats00:20:340
232739914712,23cyclictest30467-21sh19:50:010
232739914620,27cyclictest1429-21diskstats20:10:320
232739914616,25cyclictest4873-21df_inode20:30:270
232739914616,23cyclictest26459-21diskstats22:40:310
232739914613,22cyclictest18240-21irqstats21:50:400
232739914613,110cyclictest31044-21which23:05:590
232739914578,44cyclictest8751-21grep20:55:060
232739914516,25cyclictest740-21/usr/sbin/munin20:05:420
232739914433,92cyclictest28986-21apt-get19:40:140
232739914313,31cyclictest30090-21ntpq23:00:500
232739914216,22cyclictest23006-21df22:20:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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