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2026-05-29 - 19:43

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Fri May 29, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
35824612910,2chrt0-21swapper/109:55:391
3458615995747,8cyclictest3562104-21/usr/sbin/munin09:35:561
3458615995746,9cyclictest3581908-21apt-get09:55:001
3458615995746,9cyclictest3581908-21apt-get09:55:001
35588582550,4chrt0-21swapper/109:30:481
3458615995246,4cyclictest3572262-21kworker/u8:1+flush-8:010:27:031
3458611995040,8cyclictest3711728-21ntpq12:00:520
36701902480,5chrt0-21swapper/111:20:471
3458611994738,7cyclictest3666842-21ntpq11:15:490
3458611994638,6cyclictest3722463-21latency_hist12:15:000
3458615994537,6cyclictest2111821-21kworker/u8:1+flush-8:007:35:561
3458615994336,5cyclictest3607278-21apt-get10:20:381
3458611994335,6cyclictest3741482-21ntpq12:30:510
3458615994135,4cyclictest3653280-21apt-get11:05:391
3458615994132,6cyclictest3471588-21latency_hist07:30:011
35483602400,18sleep3451irq_work/309:20:463
3458611994030,8cyclictest3472754-21diskstats07:35:410
3458611993927,9cyclictest1704890-21systemd-journal10:41:480
3458611993833,3cyclictest3617492-21kworker/u8:2+flush-8:010:35:420
3458611993828,7cyclictest3653255-21/usr/sbin/munin11:05:540
3458611993828,7cyclictest3562380-21diskstats09:35:420
3458619993728,6cyclictest1704890-21systemd-journal10:45:012
3458615993730,5cyclictest3567154-21apt-get09:40:371
3458611993730,5cyclictest3637244-21ntpq10:45:520
3458611993728,7cyclictest3489565-21diskstats08:05:420
345861999367,16cyclictest3668081-21apt-get11:20:372
3458615993628,6cyclictest3541604-21cp09:14:591
3458611993628,6cyclictest3732450-21latency_hist12:25:010
3458611993626,7cyclictest1704890-21systemd-journal11:22:490
37047332350,2sleep3481ktimers/311:55:483
3458615993530,3cyclictest3723479-21irqrtprio12:15:431
3458615993530,3cyclictest3460990-21irqrtprio07:15:041
3458615993528,6cyclictest3510206-21kworker/u8:3+flush-8:009:00:581
34582922353,10sleep10-21swapper/107:08:101
3458615993428,5cyclictest3682295-21kworker/u8:0+flush-8:011:40:561
3458615993428,5cyclictest3582810-21kworker/u8:0+flush-8:010:10:561
3458611993430,2cyclictest3576970-21systemd-run09:50:000
3458611993428,4cyclictest3510206-21kworker/u8:3+flush-8:009:00:430
3458611993427,5cyclictest1704890-21systemd-journal07:55:000
3458611993427,5cyclictest1704890-21systemd-journal07:54:590
3458611993425,7cyclictest3716652-21ntpq12:05:510
345861999338,13cyclictest3556662-21apt-get09:30:022
3458611993329,2cyclictest3675707-21kthreadcore11:25:490
3458611993329,2cyclictest3675707-21kthreadcore11:25:480
3458611993326,5cyclictest1704890-21systemd-journal07:45:000
3458611993325,6cyclictest3697466-21latency_hist11:50:010
3458611993323,8cyclictest3707385-21apt-get12:00:000
3458615993227,4cyclictest3617492-21kworker/u8:2+flush-8:011:32:201
3458615993225,5cyclictest3551429-21kworker/u8:3+flush-8:009:45:561
3458611993228,2cyclictest3521744-21systemd-run08:55:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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