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2026-06-13 - 23:44

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 792 highest latencies:
System rack5slot7s.osadl.org (updated Sat Jun 13, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28838224342201,89sleep00-21swapper07:09:350
289309916214,124cyclictest25689-21munin-run10:00:020
289309916116,24cyclictest32483-21apt-get07:30:350
289309916015,121cyclictest3107-21/usr/sbin/munin11:00:060
289309915915,119cyclictest17965-21users09:11:090
289309915914,120cyclictest19043-21diskstats09:20:330
289309915816,116cyclictest21448-21apt-get09:37:000
289309915815,39cyclictest10122-21apt08:30:010
289309915813,120cyclictest19795-21apt-get09:25:260
289309915715,118cyclictest6449-21memory08:05:440
289309915619,26cyclictest30267-21df_inode07:15:470
289309915617,116cyclictest3102-21apt-get11:01:140
289309915616,118cyclictest11597-21apt11:50:010
289309915611,120cyclictest7529-21ls11:25:220
289309915516,24cyclictest6546-21apt11:20:010
289309915515,114cyclictest17334-21apt-get12:25:190
289309915514,24cyclictest2032-21apt-get07:40:240
289309915511,27cyclictest29725-21apt-get10:25:320
289309915511,122cyclictest11950-21apt-get08:40:430
289309915441,94cyclictest1764-21unixbench_singl07:36:120
289309915434,26cyclictest10919-21apt08:35:010
289309915416,40cyclictest21450-21munin-run09:35:030
289309915416,113cyclictest32485-21munin-run07:30:010
289309915413,118cyclictest29735-21munin-node07:15:070
289309915340,93cyclictest24183-21latency_hist09:50:060
289309915337,22cyclictest31498-21switchtime07:21:000
289309915317,111cyclictest16796-21grep09:05:510
289309915316,24cyclictest18241-21diskstats12:30:340
289309915315,24cyclictest18815-21munin-run09:20:020
289309915220,108cyclictest11939-21memory11:50:430
289309915216,112cyclictest16415-21apt12:20:010
289309915213,25cyclictest10797-21modprobe11:45:000
289309915213,100cyclictest14565-21apt-get08:56:090
289309915210,23cyclictest27543-21if_eth010:10:360
289309915127,33cyclictest0-21swapper09:40:480
289309915119,111cyclictest10919-21apt-get08:35:410
289309915113,22cyclictest5387-21/usr/sbin/munin11:10:530
289309915112,116cyclictest8739-21snmpd08:21:220
289309915112,115cyclictest3535-21/usr/sbin/munin07:46:100
289309915111,24cyclictest8316-21/usr/sbin/munin11:30:110
289309915110,25cyclictest14480-21grep12:05:530
28930991509,117cyclictest5271-21cron08:00:000
289309915036,94cyclictest29744-21gpgv10:25:060
289309915015,23cyclictest31172-21ntp_states10:30:580
289309915015,112cyclictest8739-21snmpd09:01:550
289309914921,27cyclictest16647-21diskstats12:20:320
289309914920,106cyclictest9290-21apt-get11:35:270
289309914919,103cyclictest25809-21apt-get10:00:200
289309914918,108cyclictest12736-21memory11:55:450
289309914918,104cyclictest29829-21munin-node08:10:110
289309914915,19cyclictest24301-21diskstats09:50:320
289309914912,98cyclictest13325-21grep08:45:530
289309914912,114cyclictest12784-21systemd-journal10:42:320
289309914910,101cyclictest32271-21head10:36:040
289309914816,89cyclictest3793-21apt-get07:50:180
289309914815,110cyclictest924-21diskstats10:45:320
289309914814,37cyclictest5779-21grep08:00:560
289309914814,35cyclictest19631-21munin-run12:40:020
289309914813,111cyclictest8513-21munin-run08:20:030
28930991479,117cyclictest4253-21apt-get11:05:160
28930991477,117cyclictest14172-21tr08:50:460
289309914729,20cyclictest0-21swapper12:10:210
289309914718,105cyclictest26847-21memory10:05:450
289309914711,110cyclictest14078-21grep12:05:040
289309914611,24cyclictest2347-21cat10:55:040
289309914417,26cyclictest7083-21/usr/sbin/munin11:20:550
289309914318,20cyclictest28304-21diskstats10:15:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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