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2025-12-06 - 13:27

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 100 highest latencies:
System rack5slot7s.osadl.org (updated Sat Dec 06, 2025 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29438224402199,96sleep00-21swapper19:06:190
298969916215,25cyclictest29302-21apt-get22:22:000
298969916018,116cyclictest4436-21apt-get23:05:160
298969916017,100cyclictest15930-21munin-run21:00:020
298969915915,121cyclictest20157-21apt-get21:25:280
298969915818,23cyclictest30691-21munin-run19:15:030
298969915817,113cyclictest6201-21irqstats23:15:390
298969915816,117cyclictest5002-21apt-get19:56:100
298969915812,121cyclictest14273-21apt-get20:50:260
298969915716,117cyclictest9954-21apt23:40:010
298969915615,118cyclictest17813-21irqstats21:10:400
298969915516,25cyclictest7774-21diskstats23:25:360
298969915516,117cyclictest12643-21irqstats23:55:410
298969915515,26cyclictest23403-21apt-get21:41:390
298969915515,24cyclictest22598-21munin-run21:40:020
298969915515,116cyclictest8698-21memory23:30:420
298969915515,116cyclictest13170-21apt-get00:01:590
298969915511,25cyclictest18725-21tr21:15:500
29896991549,24cyclictest11070-21kernelversion23:45:410
298969915417,97cyclictest16622-21apt00:20:020
298969915416,114cyclictest19969-21munin-run21:25:010
298969915411,118cyclictest2812-21/usr/sbin/munin22:56:090
298969915317,23cyclictest5004-21munin-run19:55:030
298969915315,115cyclictest21209-21diskstats21:30:390
298969915315,114cyclictest25850-21apt-get22:01:290
298969915314,23cyclictest7039-21irqstats23:20:420
298969915311,28cyclictest30650-21uname22:25:530
298969915311,25cyclictest11045-21cstates20:30:250
298969915310,41cyclictest14083-21cron20:50:000
298969915221,34cyclictest0-21swapper20:25:590
298969915218,27cyclictest31369-21diskstats22:30:320
298969915216,97cyclictest12481-21munin-run20:40:040
298969915213,25cyclictest29211-21grep22:16:050
298969915212,24cyclictest25322-21irqstats21:55:390
298969915117,111cyclictest17444-21munin-run00:25:010
298969915111,27cyclictest6843-21sshd20:04:400
298969915025,22cyclictest0-21swapper21:00:500
298969915021,27cyclictest31126-21apt-get19:15:370
298969915019,24cyclictest9626-21memory20:20:450
298969915015,110cyclictest27796-21/usr/sbin/munin22:10:440
298969915014,97cyclictest3410-21apt19:45:020
298969915013,113cyclictest1914-21munin-run22:50:020
298969915012,115cyclictest32668-21cat19:25:030
298969915010,22cyclictest17974-21sendmail_mailqu00:25:590
29896991499,115cyclictest1005-21grep19:30:020
298969914917,27cyclictest24356-21apt-get21:50:160
298969914917,108cyclictest7065-21diskstats20:05:300
298969914913,28cyclictest19807-21sshd00:36:410
298969914911,99cyclictest3649-21grep23:00:210
29896991489,117cyclictest12598-21/usr/sbin/munin20:41:110
298969914871,41cyclictest15098-21cat00:10:050
298969914816,113cyclictest17543-21modprobe21:10:010
298969914812,23cyclictest2483-21awk22:51:100
298969914812,23cyclictest2471-21ls19:36:010
298969914812,114cyclictest5600-21grep23:10:540
298969914810,116cyclictest1510-21grep19:30:550
298969914810,115cyclictest8364-21grep20:11:060
298969914733,18cyclictest0-21swapper19:45:540
298969914728,22cyclictest8914-21grep20:15:540
298969914629,19cyclictest27243-21memory22:05:500
298969914613,25cyclictest15834-21latency_hist00:15:020
298969914612,27cyclictest728-21ntpq22:40:510
29896991459,40cyclictest10788-21sort23:45:030
298969914526,21cyclictest0-21swapper21:45:480
298969914513,108cyclictest12366-21munin-plugin-st23:55:000
298969914420,98cyclictest18341-21apt-get00:30:190
298969914410,23cyclictest32712-21/usr/sbin/munin22:36:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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