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2026-08-14 - 13:15

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 Fri Aug 14, 2026 00:43:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2659098998168,5cyclictest0-21swapper/100:16:041
2659098996739,24cyclictest2750223-21sendmail22:40:011
2659098995443,5cyclictest0-21swapper/100:36:551
2659098995443,5cyclictest0-21swapper/100:36:551
2659097995040,2cyclictest0-21swapper/021:00:010
2659097994834,11cyclictest2822557-40mandb00:36:510
2659097994834,11cyclictest2822557-40mandb00:36:510
2659098994638,5cyclictest2805285-21systemd-run00:10:011
2659098994633,10cyclictest2719694-21sh21:50:011
2659097994639,4cyclictest2713599-21systemd-run21:40:020
2659097994639,4cyclictest2713599-21systemd-run21:40:020
2659099994537,5cyclictest2680087-21idleruntime-cro20:20:012
2659098994536,6cyclictest2666605-21systemd-run19:35:021
2659099994441,2cyclictest0-21swapper/200:36:572
2659099994441,2cyclictest0-21swapper/200:36:572
2659099994435,5cyclictest2725785-21sendmail22:00:012
2659097994438,4cyclictest2665069-21kworker/u8:7+xprtiod20:01:010
2659099994334,5cyclictest2799166-21ssh00:00:012
265909899436,31cyclictest2714838-21ssh21:41:011
265909899436,31cyclictest2714838-21ssh21:41:011
2659098994335,5cyclictest2796101-21systemd-run23:55:011
2659098994335,5cyclictest2796101-21systemd-run23:55:011
2659098994335,5cyclictest2662132-21latency_hist19:20:011
2659098994332,7cyclictest0-21swapper/100:26:041
2659098994236,3cyclictest0-21swapper/119:40:011
2659099994132,6cyclictest485-21in:imuxsock21:44:592
2659099994132,6cyclictest485-21in:imuxsock21:44:592
2659099994132,5cyclictest2811417-21diskmemload00:20:022
2659099994131,6cyclictest2699889-21unixbench_multi21:16:092
2659098994133,5cyclictest1001-21mta-sts-daemon22:45:471
265909799415,33cyclictest2730002-21ssh22:05:550
2659097994133,5cyclictest12650irq/32-eth023:21:010
2659097994131,7cyclictest2790901-21latency23:45:510
2659097994131,7cyclictest2790901-21latency23:45:510
2659097994124,14cyclictest151ktimers/021:30:570
2659099994029,8cyclictest2769987-21mailstats23:11:032
2659097994034,3cyclictest1002-21mta-sts-daemon00:10:560
2659097994016,19cyclictest2696277-21ssh21:10:580
265909899392,29cyclictest2757475-21ssh22:50:551
2659097993930,6cyclictest420-21avahi-daemon22:53:490
2659097993923,13cyclictest2741084-21ssh22:25:010
265909799392,29cyclictest2686960-21sshd20:40:540
2659097993922,14cyclictest151ktimers/022:15:550
2659099993830,5cyclictest2681592-21idleruntime-cro20:25:002
2659099993830,5cyclictest2681592-21idleruntime-cro20:25:002
2659099993829,6cyclictest2727562-21unixbench_singl22:01:082
2659099993829,4cyclictest0-21swapper/223:30:572
2659099993827,8cyclictest2756795-21/usr/sbin/munin22:50:522
2659098993830,5cyclictest2735930-21latency22:15:511
2659098993829,6cyclictest2695090-21sh21:10:011
265909799383,29cyclictest2803495-21sshd00:06:030
2659097993830,5cyclictest2799158-21cups-browsed00:26:100
2659097993830,5cyclictest0-21swapper/000:00:000
2659097993829,7cyclictest2681864-21aten_r2power_cu20:25:440
2659097993829,7cyclictest2681864-21aten_r2power_cu20:25:440
265909799382,33cyclictest2733157-21sh22:10:590
2659098993731,3cyclictest0-21swapper/123:40:021
2659098993727,5cyclictest0-21swapper/121:50:581
2659097993731,4cyclictest2786904-21sh23:40:010
2659097993730,4cyclictest2747160-21cron22:35:010
2659097993729,5cyclictest2788605-21unixbench-2d23:41:070
2659097993724,4cyclictest2662173-21latency_hist19:20:020
2659099993630,3cyclictest0-21swapper/222:35:012
2659099993629,4cyclictest2735130-21latency_hist22:15:022
2659099993628,5cyclictest2719835-21latency_hist21:50:022
2659099993628,5cyclictest2663598-21idleruntime-cro19:25:002
2659099993628,5cyclictest2663598-21idleruntime-cro19:25:002
2659099993625,8cyclictest2806756-21switchtime00:11:052
2659098993628,5cyclictest2727522-21grep22:01:081
2659098993628,5cyclictest2704363-21systemd-run21:25:021
2659098993628,5cyclictest1-21systemd23:45:021
2659098993613,18cyclictest421-21dbus-daemon20:50:541
265909999354,27cyclictest2778991-21ssh23:26:012
2659099993529,3cyclictest0-21swapper/221:20:502
2659099993527,3cyclictest0-21swapper/222:25:582
2659099993524,7cyclictest428-21mta-sts-daemon21:35:462
2659099993524,7cyclictest428-21mta-sts-daemon21:35:462
2659099993523,8cyclictest421-21dbus-daemon23:40:022
265909999351,25cyclictest2800312-21ssh00:00:572
2659098993528,3cyclictest0-21swapper/123:31:011
2659098993528,3cyclictest0-21swapper/121:20:011
2659098993527,6cyclictest2814481-21systemd00:25:021
2659098993527,5cyclictest2768576-21ssh23:10:011
2659098993527,5cyclictest2710489-21cron21:35:011
2659098993527,5cyclictest2695090-21diskmemload00:00:011
2659097993530,2cyclictest0-21swapper/021:30:010
2659097993528,5cyclictest2716768-21latency_hist21:45:020
2659097993528,5cyclictest2716768-21latency_hist21:45:020
2659097993527,5cyclictest2751418-21ntp_kernel_pll_22:40:560
2659097993522,9cyclictest421-21dbus-daemon00:00:050
2659097993516,14cyclictest151ktimers/022:56:000
2659097993516,14cyclictest151ktimers/022:56:000
265909799351,27cyclictest12650irq/32-eth023:10:560
2659097993510,18cyclictest2726949-21ssh22:00:560
2659099993427,4cyclictest2767261-21unixbench_multi23:06:072
2659099993426,4cyclictest0-21swapper/221:30:012
2659098993426,5cyclictest2799158-21cups-browsed00:11:071
2659098993425,6cyclictest2770277-21unixbench-2d23:11:081
2659098993425,5cyclictest0-21swapper/122:20:561
2659099993326,3cyclictest0-21swapper/220:06:042
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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