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2025-12-28 - 12:35

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 highest latencies:
System rack5slot7s.osadl.org (updated Sun Dec 28, 2025 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31318224002170,88sleep00-21swapper19:09:510
313789916021,108cyclictest5713-21apt-get23:10:220
313789915824,114cyclictest14651-21apt-get20:45:150
313789915823,106cyclictest18083-21diskstats00:25:360
313789915728,106cyclictest0-21swapper19:40:580
313789915718,23cyclictest18296-21memory21:06:230
313789915714,40cyclictest14281-21wc20:40:560
313789915542,93cyclictest6397-21timerwakeupswit19:51:070
313789915518,108cyclictest1683-21apt-get22:45:190
313789915515,23cyclictest31587-21users22:26:060
313789915510,118cyclictest3564-21awk22:55:480
31378991549,28cyclictest19312-21mailstats21:11:030
313789915430,18cyclictest0-21swapper21:55:000
313789915418,93cyclictest32169-21munin-run19:15:030
313789915413,117cyclictest11449-21apt-get20:25:230
313789915411,102cyclictest6911-21tr19:55:540
31378991539,119cyclictest5451-21cat23:06:010
313789915317,110cyclictest888-21apt-get22:40:180
313789915316,21cyclictest10630-21munin-run23:40:010
313789915316,113cyclictest7424-21munin-run23:20:030
313789915315,23cyclictest7515-21/usr/sbin/munin20:00:270
313789915315,114cyclictest29562-21cat22:15:450
313789915313,26cyclictest3366-21/usr/sbin/munin19:35:470
313789915311,28cyclictest426-21grep22:35:540
313789915235,96cyclictest20759-21missed_timers21:20:490
313789915122,106cyclictest0-21swapper19:30:520
313789915116,27cyclictest13033-21/usr/sbin/munin20:36:090
313789915115,95cyclictest27612-21munin-run22:05:010
313789915114,111cyclictest4730-21unixbench_singl23:01:020
313789915112,26cyclictest20097-21find21:15:550
31378991509,27cyclictest24302-21ls21:41:010
31378991509,116cyclictest15629-21wc00:10:250
313789915040,22cyclictest28548-21cpu22:10:220
313789915038,22cyclictest27712-21apt22:05:130
313789915014,23cyclictest26768-21sshd21:58:220
313789915013,25cyclictest2588-21diskstats22:50:350
313789915012,37cyclictest289-21snmpd19:26:060
313789915012,112cyclictest795-21unixbench_singl19:16:200
313789915011,118cyclictest32363-21grep22:31:020
31378991499,118cyclictest16464-21sort20:55:430
31378991498,118cyclictest13843-21munin-run00:00:010
313789914918,26cyclictest983-21apt-get19:20:190
313789914917,22cyclictest30375-21memory22:20:490
313789914917,110cyclictest24504-21apt-get21:45:220
313789914916,37cyclictest20255-21munin-run00:40:020
313789914914,109cyclictest18963-21kernelversion00:30:420
313789914912,23cyclictest21991-21munin-plugin-st21:30:010
313789914910,26cyclictest12964-21latency_hist20:35:030
313789914816,108cyclictest17054-21munin-run00:20:020
313789914813,26cyclictest9139-21sshd23:30:140
313789914812,36cyclictest11072-21/usr/sbin/munin23:40:520
313789914731,92cyclictest10526-21sh20:20:010
313789914730,19cyclictest0-21swapper20:11:010
313789914718,23cyclictest10765-21diskstats20:20:310
313789914715,92cyclictest8236-21apt-get20:05:230
313789914715,32cyclictest17733-21sshd21:03:220
313789914713,110cyclictest15442-21/usr/sbin/munin20:51:020
313789914711,113cyclictest22775-21cron21:35:010
31378991469,38cyclictest8176-21sed23:21:020
313789914634,90cyclictest17823-21uptime00:21:020
313789914621,99cyclictest12585-21memory23:50:430
313789914617,26cyclictest23589-21munin-run21:40:020
313789914614,26cyclictest5172-21cat19:45:390
313789914611,49cyclictest15000-21memory00:05:460
313789914529,22cyclictest14500-21grep00:01:010
313789914519,26cyclictest12206-21users23:46:110
313789914515,26cyclictest8584-21memory23:25:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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