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2026-10-01 - 02:12

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 Thu Oct 01, 2026 00:42:37)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
384446499545,40cyclictest4005724-21ssh00:36:191
3844463994740,4cyclictest3984476-21latency_hist00:00:030
3844464994635,7cyclictest3880459-21idleruntime-cro21:10:011
3844464994633,7cyclictest1003-21mta-sts-daemon21:23:181
3844463994638,5cyclictest4192074-21systemd-logind19:40:020
3844463994436,5cyclictest3866978-21systemd-run20:25:020
384446399442,18cyclictest3964220-21ssh23:26:210
3844464994335,4cyclictest1001-21mta-sts-daemon23:35:251
3844463994336,5cyclictest3972047-21ssh23:40:010
3844464994237,2cyclictest0-21swapper/100:15:001
3844464994237,2cyclictest0-21swapper/100:15:001
3844464994234,5cyclictest3901952-21systemd-run21:45:021
3844464994231,7cyclictest4192074-21systemd-logind00:00:021
3844463994236,4cyclictest4007475-21sendmail00:40:010
3844464994132,4cyclictest0-21swapper/122:21:261
3844464994131,6cyclictest420-21avahi-daemon21:34:211
3844464994130,4cyclictest0-21swapper/122:51:201
384446499410,6cyclictest171rcu_preempt21:46:191
384446399413,32cyclictest3924578-21ssh22:21:230
3844465994032,5cyclictest3848989-21systemd-run19:25:022
3844464994034,3cyclictest0-21swapper/121:40:011
3844464994033,4cyclictest3882308-21grep21:11:331
3844464994032,5cyclictest3962985-21latency_hist23:25:021
3844464994029,8cyclictest3958535-21timerandwakeup23:16:311
3844465993931,5cyclictest3866966-21munin-plugin-st20:25:012
384446599391,30cyclictest3924634-21ssh22:21:252
3844464993932,4cyclictest3947687-21sendmail23:00:011
3844464993930,6cyclictest3953785-21systemd-run23:10:011
3844464993930,5cyclictest3989165-21ssh00:10:001
3844464993929,5cyclictest3900998-21kworker/u8:9-xprtiod21:51:181
3844464993928,7cyclictest0-21swapper/122:40:021
3844464993927,7cyclictest3865437-21cron20:20:011
384446499392,28cyclictest3930787-21ssh22:31:251
3844465993832,3cyclictest0-21swapper/223:36:312
3844465993831,3cyclictest0-21swapper/223:15:012
3844465993830,5cyclictest3984507-21latency_hist00:00:032
3844465993829,3cyclictest0-21swapper/223:41:202
384446599381,31cyclictest3912486-21ssh22:01:242
3844463993832,4cyclictest3900764-21unixbench_singl21:41:320
3844463993830,4cyclictest0-21swapper/021:26:220
3844463993827,8cyclictest0-21swapper/021:51:310
3844463993813,18cyclictest12650irq/32-eth021:16:240
3844465993730,4cyclictest4007492-21sendmail00:40:012
3844465993730,4cyclictest3850472-21systemd-run19:30:012
3844464993730,3cyclictest0-21swapper/121:16:331
3844463993730,4cyclictest3941607-21ssh22:50:010
3844463993729,6cyclictest3913024-21sshd22:01:330
3844465993629,4cyclictest3966773-21cpuspeed23:31:102
3844465993628,5cyclictest3943418-21unixbench_multi22:51:312
3844465993627,6cyclictest1002-21mta-sts-daemon21:26:152
3844464993627,6cyclictest3995310-21true00:20:011
3844464993627,5cyclictest3936557-21kernelversion22:41:161
3844464993627,5cyclictest3936557-21kernelversion22:41:161
3844464993626,7cyclictest420-21avahi-daemon23:04:441
3844464993626,7cyclictest420-21avahi-daemon23:04:441
384446399363,25cyclictest3888043-21ssh21:21:270
3844463993629,5cyclictest3921711-21proc_pri22:16:270
3844463993629,4cyclictest3995273-21munin-plugin-st00:20:000
3844463993629,4cyclictest3955624-21tail23:11:330
3844463993619,11cyclictest12650irq/32-eth023:06:240
384446399361,31cyclictest3915608-21ssh22:06:260
3844465993529,3cyclictest0-21swapper/221:20:022
3844465993528,3cyclictest0-21swapper/219:35:012
3844465993527,5cyclictest3863946-21debian-sa120:15:002
3844465993527,5cyclictest0-21swapper/220:20:012
3844465993526,6cyclictest566-21gmain22:30:412
384446499354,25cyclictest3939984-21ssh22:46:281
3844464993527,5cyclictest420-21avahi-daemon20:49:441
3844464993527,5cyclictest1-21systemd20:45:021
3844464993526,6cyclictest421-21dbus-daemon23:45:011
3844464993526,6cyclictest3869871-21head20:31:371
3844463993529,4cyclictest2148611-21cups-browsed23:21:170
3844463993524,8cyclictest3854276-21needreboot19:41:210
3844465993428,3cyclictest0-21swapper/222:00:012
3844465993428,3cyclictest0-21swapper/220:35:012
3844465993426,5cyclictest3946498-21unixbench_singl22:56:312
3844465993426,5cyclictest3859479-21systemd-run20:00:012
3844465993426,4cyclictest0-21swapper/221:36:242
3844465993425,6cyclictest1-21systemd22:20:012
3844465993424,8cyclictest3887907-21sh21:21:202
3844465993423,8cyclictest3948849-21missed_timers23:01:182
3844465993423,8cyclictest3948849-21missed_timers23:01:182
3844465993422,8cyclictest0-21swapper/221:41:272
384446599342,18cyclictest3979505-21ssh23:51:222
3844464993427,3cyclictest0-21swapper/122:26:251
3844464993425,5cyclictest1003-21mta-sts-daemon23:31:171
384446399342,26cyclictest3933850-21sh22:36:250
384446399341,29cyclictest3948552-21/usr/sbin/munin23:01:120
384446399341,29cyclictest3948552-21/usr/sbin/munin23:01:120
384446399341,28cyclictest3979558-21ssh23:51:240
3844465993325,5cyclictest3994136-21unixbench_singl00:16:312
3844465993325,4cyclictest0-21swapper/200:26:222
3844465993321,7cyclictest0-21swapper/200:21:202
3844464993326,4cyclictest3850390-21unixbench_singl19:26:381
3844464993324,6cyclictest3877368-21unixbench_singl20:56:351
384446499332,23cyclictest3918505-21ssh22:11:201
3844464993317,12cyclictest271ktimers/119:16:251
3844463993328,3cyclictest151ktimers/019:16:250
3844463993327,4cyclictest3932435-21munin-run22:35:010
384446399332,26cyclictest3936909-21rm22:41:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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