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2026-09-14 - 23:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, 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 here to display the system's profile data or here to proceed to next system.
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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 rack2slot7s.osadl.org (updated Mon Sep 14, 2026 12:42:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3698165995437,14cyclictest3740263-21ssh09:20:012
3698165995431,20cyclictest3713135-21munin-run08:00:002
3698165995431,20cyclictest3713135-21munin-run08:00:002
3698163994841,4cyclictest3776758-21munin-run10:20:010
3698163994639,4cyclictest3764853-21kworker/u8:3+xprtiod11:00:020
3698163994639,4cyclictest3728250-21latency_hist08:50:020
3698165994535,6cyclictest265-21systemd-journal12:09:592
3698163994538,4cyclictest3747467-21missed_timers09:31:080
3698165994435,4cyclictest3819567-21kworker/u8:9-xprtiod12:01:162
369816599443,33cyclictest3726056-21ntpq08:41:112
369816599441,36cyclictest3808502-21ntpq11:11:142
3698165994334,6cyclictest3807315-21latency_hist11:10:022
3698165994334,6cyclictest0-21swapper/212:40:012
369816599431,39cyclictest3708127-21ntpq07:41:162
369816599431,37cyclictest3844985-21ntpq12:11:132
369816599431,37cyclictest3724504-21ntpq08:36:112
369816599431,36cyclictest3727495-21ntpq08:46:092
3698164994333,7cyclictest0-21swapper/111:00:011
369816599422,35cyclictest3720008-21ntpq08:21:132
369816599421,33cyclictest3714129-21ntpq08:01:152
3698164994233,5cyclictest0-21swapper/111:06:181
3698163994228,11cyclictest3833308-21grep11:51:230
3698165994135,3cyclictest0-21swapper/210:40:012
3698165994127,11cyclictest0-21swapper/211:20:012
369816599412,35cyclictest3814525-21ntpq11:21:122
369816599412,34cyclictest3721539-21ntpq08:26:122
369816599411,35cyclictest3717132-21ntpq08:11:162
369816599411,24cyclictest3789190-21sh10:40:072
3698164994135,3cyclictest0-21swapper/108:00:001
3698164994135,3cyclictest0-21swapper/108:00:001
3698163994135,4cyclictest3777348-21aten_r2power_cu10:21:000
3698163994130,8cyclictest3766285-21timerandwakeup10:01:240
3698163994128,10cyclictest2910165-21cups-browsed09:53:380
3698163994127,12cyclictest1001-21mta-sts-daemon10:30:010
369816599403,33cyclictest3733626-21ntpq09:06:172
3698165994033,3cyclictest0-21swapper/210:51:152
369816599401,35cyclictest3699137-21ntpq07:11:172
369816599401,32cyclictest3730479-21ntpq08:56:082
369816599400,37cyclictest3702061-21ntpq07:21:122
369816499403,29cyclictest3802453-21ssh11:01:181
3698164994031,6cyclictest3780391-21aten_r2power_cu10:26:021
3698164994031,5cyclictest3767658-21/usr/sbin/munin10:05:011
3698163994030,8cyclictest3852807-21sh12:25:010
3698163994027,10cyclictest3735441-21ntpq09:11:180
3698163994027,10cyclictest3735441-21ntpq09:11:180
3698165993931,5cyclictest3776751-21cron10:20:002
369816599392,33cyclictest3835757-21ntpq11:56:102
369816599392,31cyclictest3772025-21ntpq10:11:142
369816599392,31cyclictest3706533-21ntpq07:36:162
369816599391,35cyclictest3826650-21ntpq11:41:112
369816599391,35cyclictest3820585-21ntpq11:31:122
369816599391,35cyclictest3750112-21aten_r2power_vo09:36:022
369816599391,34cyclictest3703639-21ntpq07:26:212
369816599391,34cyclictest3703639-21ntpq07:26:212
369816599391,32cyclictest3753813-21ntpq09:41:172
369816599391,32cyclictest3753813-21ntpq09:41:172
3698164993932,4cyclictest3734145-21latency_hist09:10:001
3698164993931,5cyclictest694-21cron11:40:011
3698164993931,5cyclictest1-21systemd12:40:021
3698164993927,9cyclictest3707974-21needreboot07:41:101
369816399396,26cyclictest3808350-21ssh11:11:090
369816399394,32cyclictest3719106-21kworker/0:1+events_power_efficient08:21:230
3698163993932,4cyclictest0-21swapper/012:20:010
3698163993929,7cyclictest3802247-21needreboot11:01:100
3698163993929,7cyclictest3700176-21fschecks_time07:16:070
3698163993927,9cyclictest3768822-21needreboot10:06:100
3698165993830,4cyclictest0-21swapper/211:01:152
3698165993828,7cyclictest3710960-21needreboot07:51:132
3698165993828,7cyclictest3710960-21needreboot07:51:132
369816599382,32cyclictest3729003-21ntpq08:51:092
369816599382,31cyclictest3854022-21ntpq12:26:102
3698165993822,13cyclictest3766391-21unixbench-2d10:01:242
3698165993819,15cyclictest0-21swapper/212:20:012
369816599381,34cyclictest3723075-21ntpq08:31:142
369816599381,33cyclictest3744555-21ntpq09:26:122
369816599381,33cyclictest3718617-21ntpq08:16:172
369816599381,32cyclictest3762804-21ntpq09:56:132
369816599381,32cyclictest3731402-21/usr/sbin/munin09:01:012
369816599381,32cyclictest3709622-21ntpq07:46:152
369816599381,32cyclictest2910165-21cups-browsed12:33:552
369816599380,32cyclictest3817501-21ssh11:26:102
3698164993830,5cyclictest439-21systemd-logind09:55:011
3698164993830,5cyclictest3737384-21latency_hist09:15:021
3698164993830,5cyclictest3737384-21latency_hist09:15:021
3698164993830,5cyclictest0-21swapper/111:20:011
3698163993832,3cyclictest0-21swapper/010:51:000
3698163993831,3cyclictest0-21swapper/011:16:140
3698163993830,5cyclictest420-21avahi-daemon07:10:020
3698163993828,6cyclictest3766978-21kworker/u8:4-xprtiod11:56:180
3698163993828,4cyclictest3764623-21sendmail10:00:010
369816399382,31cyclictest3716375-21kworker/0:0+events_power_efficient08:16:170
3698163993821,13cyclictest12650irq/32-eth012:06:120
3698163993820,12cyclictest12650irq/32-eth011:41:150
3698163993815,20cyclictest3750629-21ld09:36:110
3698165993728,6cyclictest3741742-21ssh09:21:222
3698165993718,15cyclictest0-21swapper/212:21:162
369816599371,32cyclictest3777996-21ntpq10:21:102
369816599371,32cyclictest3715521-21ntpq08:06:122
369816599370,32cyclictest3768139-21ssh10:05:502
369816599370,23cyclictest3734143-21diskmemload09:30:162
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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