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2026-07-12 - 17:39

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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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.

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 100 highest latencies:
System rack5slot4s.osadl.org (updated Sun Jul 12, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
279443123260,3sleep3451irq_work/310:00:133
262189299167162,3cyclictest2947692-21latency_hist12:35:011
2621889996245,15cyclictest2947542-21apt-get12:35:010
27721882580,6chrt451irq_work/309:35:163
27577452560,2chrt481ktimers/309:20:243
26881022500,1sleep02688105-21switchtime08:10:220
2621892995040,7cyclictest2713622-21latency_hist08:40:001
2621889995041,6cyclictest2818607-21kworker/u8:1+flush-8:012:10:160
2621892994839,6cyclictest2793211-21latency_hist10:00:001
2621889994740,5cyclictest2813001-21kworker/u8:4+flush-8:010:20:000
2621892994637,6cyclictest2932535-21latency_hist12:20:011
2621889994640,4cyclictest2607384-21kworker/u8:2+flush-8:007:40:160
2621889994536,6cyclictest2827257-21ntpq10:30:130
29080242440,5sleep20-21swapper/211:55:042
2621892994334,7cyclictest2941517-21ntpq12:25:151
2621889994333,7cyclictest1704890-21systemd-journal09:10:000
2621892994233,7cyclictest2748350-21/usr/sbin/munin09:15:141
2621892994233,6cyclictest2897869-21latency_hist11:45:021
2621892994232,8cyclictest2732509-21ntpq08:55:171
2621892994232,8cyclictest2732509-21ntpq08:55:161
2621889994235,5cyclictest2708156-21kworker/u8:3+flush-8:009:10:080
28994722410,2sleep3471rcuc/311:45:113
2621892994134,5cyclictest2747366-21ntpq09:10:151
2621889994135,4cyclictest2762392-21kworker/u8:2+flush-8:009:30:230
2621889994135,4cyclictest2579504-21kworker/u8:1+flush-8:008:25:070
2621889994134,5cyclictest2663530-21kworker/u8:3+flush-8:007:55:160
2621889994131,8cyclictest2642808-21ntpq07:25:150
2621892994036,3cyclictest2762283-21ntpq09:25:171
2621892994031,7cyclictest2912982-21apt-get12:00:021
2621892994031,6cyclictest1704890-21systemd-journal07:16:351
2621892994028,9cyclictest1704890-21systemd-journal10:13:441
2621892994026,10cyclictest1704890-21systemd-journal10:15:431
2621889994035,4cyclictest2607384-21kworker/u8:2+flush-8:007:50:160
2621889994034,4cyclictest2788197-21latency_hist09:55:010
2621889994015,9cyclictest2916793-21ntpq12:00:160
2621889993934,3cyclictest2743360-21kworker/u8:1+flush-8:009:25:060
2621889993933,4cyclictest2752394-21kworker/u8:0+flush-8:010:20:210
2621889993931,6cyclictest2707686-21ntpq08:30:160
2621889993931,5cyclictest2853498-21kworker/u8:2+flush-8:011:05:060
2621889993832,4cyclictest2773264-21kworker/u8:3+events_unbound09:45:210
2621889993826,8cyclictest2788217-21kworker/u8:2+flush-8:010:10:050
29431942370,3sleep375-21kworker/3:1+events12:30:083
2621892993728,7cyclictest2773117-21apt-get09:40:011
2621892993727,7cyclictest1704890-21systemd-journal11:54:431
2621889993732,3cyclictest2818607-21kworker/u8:1+flush-8:011:45:060
2621889993731,4cyclictest2752394-21kworker/u8:0+flush-8:009:35:220
2621889993731,4cyclictest2679273-21kworker/u8:0+events_unbound08:40:210
26216802373,9sleep10-21swapper/107:09:521
2621894993627,7cyclictest2947412-21apt-get12:35:032
2621892993629,5cyclictest2639110-21apt-get07:25:031
2621894993529,3cyclictest2743360-21kworker/u8:1+flush-8:010:00:042
2621892993524,8cyclictest1704890-21systemd-journal11:17:441
2621889993529,4cyclictest2679273-21kworker/u8:0+flush-8:008:20:160
2621889993528,5cyclictest2878026-21kworker/u8:0+flush-8:012:25:060
262188999351,31cyclictest2803355-21true10:10:010
2621892993430,2cyclictest2874042-21irqrtprio11:20:101
2621889993430,3cyclictest2863649-21kworker/u8:3+flush-8:011:25:230
2621889993430,3cyclictest2663530-21kworker/u8:3+flush-8:007:45:350
2621889993429,3cyclictest2607384-21kworker/u8:2+flush-8:008:00:170
2621889993425,7cyclictest2633649-21apt-get07:20:020
2621894993323,8cyclictest2633649-21apt-get07:20:002
2621894993322,9cyclictest2868660-21fschecks_count11:15:072
2621892993325,6cyclictest1704890-21systemd-journal07:31:351
2621889993328,3cyclictest2853498-21kworker/u8:2+events_unbound11:20:160
2621889993328,3cyclictest2752394-21kworker/u8:0+events_unbound10:35:100
2621889993326,5cyclictest2887006-21kworker/u8:2+flush-8:011:50:060
2621889993326,5cyclictest2752394-21kworker/u8:0+flush-8:011:00:180
2621889993326,5cyclictest2579504-21kworker/u8:1+flush-8:007:10:180
2621889993324,7cyclictest2634405-21diskstats07:20:090
26210322333,6sleep20-21swapper/207:05:232
2621894993225,5cyclictest2947406-21latency_hist12:35:012
2621894993223,7cyclictest2803939-21fschecks_time10:10:092
2621889993226,4cyclictest2679273-21kworker/u8:0+events_unbound08:45:180
2621889993225,5cyclictest2773264-21kworker/u8:3+flush-8:009:40:180
2621889993222,8cyclictest1704890-21systemd-journal12:40:000
2621889993220,10cyclictest2863649-21kworker/u8:3+flush-8:011:30:090
2621889993220,10cyclictest2863649-21kworker/u8:3+flush-8:011:30:080
27212932310,3sleep375-21kworker/3:1+events08:45:113
2621892993124,5cyclictest2649169-21apt-get07:35:031
2621889993125,5cyclictest2621730-21kworker/u8:0+events_unbound07:30:200
2621889993122,7cyclictest2852026-21ntpq10:55:170
2621889993120,9cyclictest2689248-21diskstats08:15:070
2621894993025,4cyclictest2818607-21kworker/u8:1+flush-8:010:25:092
2621894993025,4cyclictest2743360-21kworker/u8:1+flush-8:009:15:162
2621889993024,5cyclictest2798013-21kworker/u8:3+flush-8:010:45:150
2621889993024,4cyclictest2693790-21kworker/u8:2+flush-8:008:35:100
2621889993022,6cyclictest2912720-21latency_hist12:00:020
2621889993021,7cyclictest2753288-21latency_hist09:20:020
2621894992924,4cyclictest2863649-21kworker/u8:3+events_unbound11:10:172
2621894992924,3cyclictest2723811-21aten2_r5power_c08:50:042
2621894992921,6cyclictest2643766-21sh07:30:012
2621894992920,6cyclictest2664357-21cpuspeed_turbos07:50:042
2621892992922,5cyclictest2579504-21kworker/u8:1+events_unbound07:20:191
2621892992921,6cyclictest2818532-21/usr/sbin/munin10:25:161
2621889992925,3cyclictest2752394-21kworker/u8:0+events_unbound10:00:250
2621889992925,3cyclictest2708156-21kworker/u8:3+events_unbound08:55:220
2621889992925,3cyclictest2708156-21kworker/u8:3+events_unbound08:55:210
2621889992924,4cyclictest2921752-21kworker/u8:3+flush-8:012:15:070
2621889992924,3cyclictest2847033-21needreboot10:50:150
2621889992922,5cyclictest2872614-21unixbench_multi11:15:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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