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2026-03-13 - 05:11

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 Fri Mar 13, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19241224422201,96sleep00-21swapper19:07:170
195929916322,28cyclictest20341-21users19:11:040
195929916116,120cyclictest18405-21apt-get22:21:010
195929915919,98cyclictest21532-21munin-run19:20:020
195929915911,30cyclictest27378-21rm19:55:220
195929915911,124cyclictest31102-21munin-run23:35:020
195929915731,19cyclictest2365-21munin-run20:40:010
195929915728,110cyclictest6349-21wc00:20:520
195929915720,108cyclictest26446-21apt-get19:50:180
195929915711,119cyclictest8732-21ps00:35:540
195929915626,108cyclictest24086-21sshd19:35:220
195929915618,114cyclictest25487-21munin-run23:00:030
195929915615,39cyclictest19453-21apt-get22:26:090
195929915615,118cyclictest25514-21users19:41:050
195929915612,26cyclictest21649-21/usr/sbin/munin19:20:530
195929915610,120cyclictest11180-21sh21:35:010
195929915518,24cyclictest2485-21apt-get20:40:160
195929915515,114cyclictest21251-21apt-get22:35:360
195929915511,119cyclictest4693-21sed20:51:030
19592991549,25cyclictest30574-21apt-get20:16:440
19592991548,122cyclictest32106-21grep20:21:040
195929915422,28cyclictest12220-21diskstats21:40:330
195929915417,114cyclictest27308-21diskstats23:10:320
195929915413,115cyclictest25849-21memory23:00:420
195929915412,118cyclictest26343-21sh19:50:000
195929915412,116cyclictest5717-21sort00:16:000
195929915411,28cyclictest3729-21basename20:46:010
195929915320,28cyclictest28298-21apt-get20:00:280
195929915312,28cyclictest28818-21munin-node23:20:120
195929915239,22cyclictest4886-21switchtime00:11:000
195929915238,93cyclictest10215-21switchtime21:26:010
195929915231,21cyclictest0-21swapper21:20:050
195929915219,27cyclictest29089-21apt-get20:05:180
195929915213,38cyclictest11832-21sort21:35:590
19592991518,114cyclictest3806-21memory00:05:450
195929915124,109cyclictest7184-21latency_hist21:10:030
195929915118,109cyclictest31899-21apt23:40:010
195929915112,23cyclictest14761-21sort21:55:490
195929915111,28cyclictest1134-21cat23:50:050
195929915111,116cyclictest21191-21sed22:31:100
195929915024,22cyclictest110-21systemd-journal23:20:010
195929915012,115cyclictest30386-21switchtime20:10:570
195929915011,115cyclictest5549-21cron21:00:000
195929915010,40cyclictest5790-21snmpd21:10:480
195929915010,117cyclictest8108-21sed00:31:000
195929915010,117cyclictest32746-21sshd23:45:040
195929915010,115cyclictest18404-21sh22:20:010
195929914919,26cyclictest2123-21irqstats23:55:400
195929914918,105cyclictest12902-21apt-get21:45:190
195929914916,108cyclictest3461-21apt00:05:000
195929914912,112cyclictest13747-21sshd21:50:210
195929914819,103cyclictest6884-21df00:25:300
195929914813,20cyclictest30372-21latency_hist23:30:040
195929914812,115cyclictest867-21apt-get20:30:200
195929914811,110cyclictest23888-21apt22:50:000
195929914810,112cyclictest434-21grep20:25:560
195929914717,45cyclictest26512-21diskstats23:05:320
195929914717,106cyclictest16905-21apt-get22:10:110
195929914713,26cyclictest15314-21/usr/sbin/munin22:00:350
195929914618,25cyclictest8902-21apt-get21:20:170
195929914614,25cyclictest1470-21ntp_states23:50:490
195929914614,109cyclictest16108-21/usr/sbin/munin22:05:580
195929914613,108cyclictest23487-21/usr/sbin/munin19:30:460
195929914516,105cyclictest5801-21diskstats21:00:350
195929914515,107cyclictest22554-21df_inode19:25:290
195929914514,23cyclictest22509-21df_inode22:40:350
195929914318,23cyclictest24683-21munin-run22:55:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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