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2025-12-30 - 08:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Tue Dec 30, 2025 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3407016994235,5cyclictest3469251-21latency_hist20:10:013
3407009994135,4cyclictest3494974-21latency_hist20:35:001
3407011994035,3cyclictest3557205-21kworker/u8:1+flush-259:021:49:592
3407005993734,2cyclictest3650173-21kworker/u8:2+flush-259:023:35:170
3407011993630,4cyclictest3692151-21latency_hist23:45:002
3407005993512,14cyclictest3474654-21/usr/sbin/munin20:15:160
3407016993430,3cyclictest3587703-21kworker/u8:0+flush-259:022:40:003
3407005993327,4cyclictest3510437-21latency_hist20:50:010
3407016993229,2cyclictest3624283-21kworker/u8:1+flush-259:023:50:183
3407016993229,2cyclictest3587703-21kworker/u8:0+flush-259:022:05:163
3407016993228,3cyclictest3443514-21kworker/u8:3+flush-259:019:55:213
3407011993226,4cyclictest3515767-21kworker/u8:2+flush-259:021:15:232
3407016993127,3cyclictest3650173-21kworker/u8:2+events_unbound23:35:003
3407016993127,3cyclictest3374306-21kworker/u8:3+flush-259:019:20:193
3407016993026,3cyclictest3515767-21kworker/u8:2+flush-259:021:30:223
3407011993025,4cyclictest3593202-21kworker/u8:4+flush-259:022:20:262
3407011993025,3cyclictest3644621-21gpgv23:00:002
3407011993024,4cyclictest3608650-21kworker/u8:3+flush-259:022:35:232
3407011993023,5cyclictest3675416-21ntpq23:25:192
3407005993018,11cyclictest0-21swapper/022:20:000
3407011992923,4cyclictest252-21systemd-journal20:06:312
3407005992924,4cyclictest3417327-21apt-get19:20:010
3407005992916,12cyclictest3587139-21ntpq22:00:220
3407016992824,3cyclictest3702495-21kworker/u8:3+flush-259:000:25:223
3407016992824,3cyclictest3515767-21kworker/u8:2+flush-259:021:20:213
3407016992823,3cyclictest3665591-21latency_hist23:20:003
3407011992824,3cyclictest3624283-21kworker/u8:1+flush-259:023:50:242
3407011992824,3cyclictest3557205-21kworker/u8:1+flush-259:022:10:012
3407011992823,4cyclictest3587703-21kworker/u8:0+flush-259:022:25:162
3407011992822,4cyclictest3697316-21latency_hist23:50:012
3407016992724,2cyclictest3484715-21kworker/u8:2+flush-259:020:40:203
3407016992723,3cyclictest3733391-21kworker/u8:2+flush-259:000:39:203
3407016992723,3cyclictest3624283-21kworker/u8:1+flush-259:022:40:233
3407011992722,4cyclictest3515767-21kworker/u8:2+flush-259:021:20:142
3407011992721,4cyclictest3374306-21kworker/u8:3+flush-259:019:15:012
3407005992723,3cyclictest3608894-21apt-get22:25:130
3407005992713,12cyclictest3624057-21turbostat22:40:000
340700599270,17cyclictest3490118-21seq20:30:110
3407016992623,2cyclictest3707825-21kworker/u8:0+flush-259:000:15:143
3407016992622,3cyclictest3624283-21kworker/u8:1+flush-259:023:50:003
3407016992619,5cyclictest252-21systemd-journal20:25:003
3407005992620,4cyclictest3592338-21ntpq22:05:250
3407016992522,2cyclictest3587703-21kworker/u8:0+flush-259:022:15:173
3407016992521,3cyclictest3624283-21kworker/u8:1+flush-259:023:40:183
3407016992517,6cyclictest252-21systemd-journal23:15:003
3407011992521,3cyclictest3453647-21kworker/u8:1+flush-259:020:15:232
3407011992518,5cyclictest3483833-21ntpq20:20:222
340700599250,23cyclictest490-21dbus-daemon21:10:000
3407016992421,2cyclictest3624283-21kworker/u8:1+flush-259:023:55:213
3407016992421,2cyclictest3433422-21kworker/u8:2+flush-259:019:40:223
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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