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2025-11-01 - 14:19

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 50 highest latencies:
System rack5slot7s.osadl.org (updated Sat Nov 01, 2025 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23258224362186,86sleep00-21swapper19:09:300
233629916520,120cyclictest23571-21diskstats19:10:360
233629916513,128cyclictest19920-21apt-get22:02:040
233629916318,120cyclictest5894-21wc23:50:040
233629916314,122cyclictest789-21apt-get23:21:390
233629916117,121cyclictest31863-21snmpd21:33:380
233629916019,25cyclictest3534-21apt-get23:35:210
233629916018,29cyclictest29575-21apt-get19:46:450
233629915713,103cyclictest737-21munin-run20:05:040
233629915617,99cyclictest7399-21users23:56:040
233629915616,100cyclictest30029-21munin-run23:00:020
233629915615,39cyclictest1766-21apt-get20:11:360
233629915518,109cyclictest11991-21apt-get21:10:190
233629915512,120cyclictest9213-21mailstats20:51:050
233629915510,120cyclictest27934-21diskstats19:35:340
233629915418,113cyclictest27569-21grep22:41:060
233629915417,114cyclictest793-21munin-run23:20:040
233629915415,26cyclictest30577-21apt-get19:51:380
233629915413,117cyclictest24366-21apt-get22:25:260
23362991539,120cyclictest3580-21munin-plugin-st20:20:010
233629915320,26cyclictest8022-21diskstats20:45:560
233629915319,25cyclictest7567-21apt-get00:00:210
233629915317,92cyclictest10277-21munin-run21:00:020
233629915317,113cyclictest28691-21apt-get19:40:170
233629915312,104cyclictest31251-21/usr/sbin/munin23:05:530
233629915220,29cyclictest12630-21diskstats00:35:340
233629915218,25cyclictest11304-21diskstats21:05:320
233629915215,25cyclictest27977-21memory22:45:470
233629915215,117cyclictest3432-21apt23:35:020
233629915214,115cyclictest32040-21grep19:55:590
233629915213,27cyclictest12904-21/usr/sbin/munin21:15:340
233629915212,117cyclictest904-21apt-get20:05:240
233629915211,117cyclictest25121-21grep19:16:180
233629915111,41cyclictest19783-21grep21:56:050
233629915110,118cyclictest31863-21snmpd21:30:010
233629915022,26cyclictest11966-21memory00:30:450
233629915020,27cyclictest22980-21ntp_states22:15:520
233629915016,108cyclictest4497-21apt-get20:25:160
233629915015,26cyclictest17692-21wc21:45:230
233629915015,24cyclictest22039-21irqstats22:10:380
233629915013,24cyclictest112-21systemd-journal00:15:350
233629915012,28cyclictest18789-21grep21:50:560
233629915012,116cyclictest31863-21snmpd00:21:060
233629914922,99cyclictest3702-21apt-get20:20:230
233629914915,31cyclictest28828-21ntpq22:50:490
233629914915,111cyclictest16706-21apt21:40:010
233629914914,22cyclictest9192-21munin-run00:15:010
233629914914,111cyclictest27019-21/usr/sbin/munin19:30:420
233629914912,23cyclictest10471-21cstates21:00:230
233629914912,116cyclictest5885-21wc20:31:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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