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2026-03-18 - 11:31

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 all highest latencies:
System rack5slot7s.osadl.org (updated Wed Mar 18, 2026 00:45:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26882224412198,96sleep00-21swapper19:06:080
273629916313,25cyclictest27962-21diskstats22:25:330
273629916214,125cyclictest11688-21apt-get20:50:160
273629916116,120cyclictest5938-21diskstats23:30:340
273629916113,124cyclictest22007-21apt-get21:50:150
273629915732,103cyclictest10353-21kworker/u2:1323:56:500
273629915716,24cyclictest11541-21users00:01:130
273629915682,49cyclictest17382-21apt-get21:26:500
273629915625,110cyclictest18513-21apt-get21:30:190
273629915616,24cyclictest19204-21apt-get21:36:250
273629915613,118cyclictest25537-21diskstats22:10:330
273629915542,95cyclictest4601-21proc_pri23:20:550
273629915520,25cyclictest2459-21munin-run19:55:010
273629915440,21cyclictest28713-21cstates22:30:240
273629915418,112cyclictest21053-21munin-run21:45:030
273629915417,25cyclictest8525-21diskstats20:30:340
273629915413,26cyclictest4074-21apt20:05:010
273629915412,122cyclictest22971-21apt-get21:55:160
273629915412,118cyclictest6621-21/usr/sbin/munin23:35:110
273629915411,115cyclictest30112-21modprobe19:25:010
273629915322,30cyclictest12762-21diskstats20:55:400
273629915320,27cyclictest27053-21apt-get22:20:170
273629915320,106cyclictest9034-21apt-get23:50:150
273629915317,38cyclictest6479-21munin-run20:20:030
273629915316,114cyclictest16570-21munin-run21:20:020
273629915313,100cyclictest14164-21cstates00:20:220
273629915312,28cyclictest7354-21ls20:21:590
273629915310,43cyclictest31916-21diskstats19:35:340
273629915238,21cyclictest464-21ntp_kernel_pll_19:40:480
273629915214,114cyclictest21261-21diskstats21:45:330
273629915211,23cyclictest9913-21munin-run20:40:020
273629915211,119cyclictest7670-21egrep20:25:290
273629915211,117cyclictest14630-21grep21:05:550
273629915116,25cyclictest24827-21/usr/sbin/munin22:05:460
273629915115,113cyclictest4287-21diskstats20:05:340
273629915115,113cyclictest28152-21/usr/sbin/munin19:15:030
273629915115,111cyclictest12471-21/usr/sbin/munin00:11:010
273629915114,114cyclictest10828-21apt-get20:45:170
273629915111,26cyclictest17457-21apt-config21:25:070
273629915111,100cyclictest8729-21cut23:46:000
273629915110,25cyclictest14098-21grep21:01:030
273629915033,22cyclictest1087-21forks19:45:340
273629915017,23cyclictest15139-21memory00:25:450
273629915015,24cyclictest29303-21munin-run19:20:030
273629914920,29cyclictest5030-21/usr/sbin/munin23:26:060
273629914918,24cyclictest30218-21apt-get19:25:130
273629914918,108cyclictest7547-21df_inode23:40:270
273629914917,110cyclictest3516-21diskstats23:15:340
273629914914,23cyclictest15871-21irqstats00:30:420
273629914914,114cyclictest17194-21munin-run00:40:020
273629914912,29cyclictest13953-21sshd00:18:170
273629914912,108cyclictest31060-21apt-get22:45:110
273629914820,27cyclictest15719-21users21:11:060
273629914818,26cyclictest32763-21diskstats22:55:310
273629914816,24cyclictest26326-21df_inode22:15:270
273629914815,110cyclictest10134-21df20:40:250
273629914812,38cyclictest5484-21ls20:11:010
273629914812,22cyclictest1532-21cat23:00:590
273629914812,111cyclictest2880-21ls23:10:450
273629914811,113cyclictest2443-21sed23:06:020
273629914716,25cyclictest30263-21/usr/sbin/munin22:40:380
273629914715,23cyclictest32547-21apt22:55:000
273629914710,113cyclictest31706-21munin-run19:35:020
273629914618,25cyclictest23901-21diskstats22:00:330
273629914615,23cyclictest11919-21memory00:05:440
273629914611,22cyclictest30155-21tr22:40:020
273629914512,23cyclictest2980-21grep19:55:550
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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