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2026-09-17 - 00:12

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 Wed Sep 16, 2026 12:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
240960223430,5sleep30-21swapper/308:29:093
239398522330,7sleep3451irq_work/308:14:043
265542522220,2sleep3481ktimers/312:34:093
255987121950,3sleep375-21kworker/3:1-events10:59:073
250963021710,2sleep3471rcuc/310:09:083
2331580996153,6cyclictest2562028-21gpgv11:00:002
2331575995745,9cyclictest2447585-21latency_hist09:05:021
2331575995736,18cyclictest2532067-21latency_hist10:30:011
2331575995647,7cyclictest2612354-21/usr/sbin/munin11:54:181
2331575995430,21cyclictest278-21systemd-journal10:24:241
2331573995445,7cyclictest2442611-21latency_hist09:00:010
2331573995240,10cyclictest2402357-21ntpq08:19:120
2331580995143,6cyclictest278-21systemd-journal11:05:002
2331575995142,7cyclictest2448346-21/usr/sbin/munin09:09:171
2331573995040,8cyclictest2592549-21/usr/sbin/munin11:34:170
233157399500,47cyclictest1-21systemd07:15:000
2331575994939,8cyclictest2601332-21ntpq11:39:151
2331580994838,8cyclictest278-21systemd-journal11:15:002
2331575994838,8cyclictest2591784-21apt-get11:30:001
2331573994640,4cyclictest2377872-21apt-get07:55:000
2331573994538,5cyclictest2586850-21latency_hist11:25:000
2331575994424,3cyclictest2359418-21irqrtprio07:39:081
2331575994335,5cyclictest278-21systemd-journal08:04:241
2331573994337,4cyclictest2294934-21kworker/u8:4+flush-8:007:24:190
2331573994334,6cyclictest2656757-21latency_hist12:35:000
2331573994333,8cyclictest2602440-21/usr/sbin/munin11:44:200
2331573994235,4cyclictest2331445-21kworker/u8:1+flush-8:007:15:030
2331573994233,7cyclictest2372303-21ntpq07:49:120
2331575994028,5cyclictest2393693-21apt-get08:14:001
2331573994031,7cyclictest2542748-21apt-get10:44:000
2331575993931,6cyclictest2423354-21/usr/sbin/munin08:44:131
2331575993930,7cyclictest2647449-21/usr/sbin/munin12:29:181
2331575993930,6cyclictest278-21systemd-journal12:36:101
2331575993927,10cyclictest1486261-21kworker/u8:2+events_unbound07:52:521
2331573993932,5cyclictest2577517-21apt-get11:19:000
2331573993932,5cyclictest2577517-21apt-get11:19:000
2331575993831,5cyclictest278-21systemd-journal08:55:001
2331573993830,7cyclictest2331445-21kworker/u8:1+flush-8:008:14:160
2331575993728,7cyclictest2641940-21latency_hist12:20:011
2331573993730,5cyclictest2502994-21/usr/sbin/munin10:04:190
2331575993627,6cyclictest278-21systemd-journal12:30:241
2331575993626,7cyclictest278-21systemd-journal11:00:001
2331580993529,5cyclictest2487613-21kworker/u8:3+flush-8:010:54:052
2331575993526,7cyclictest2636866-21cp12:15:001
2331573993529,4cyclictest2457687-21latency_hist09:15:010
2331573993528,5cyclictest2472433-21kworker/u8:1+flush-8:010:39:050
2331573993526,7cyclictest2527132-21latency_hist10:25:010
2331573993524,8cyclictest2556326-21ntpq10:54:130
2331573993524,8cyclictest2368050-21latency_hist07:45:010
24335792340,6sleep30-21swapper/308:54:063
2331580993427,5cyclictest278-21systemd-journal09:30:002
2331575993431,2cyclictest2547149-21systemd-run10:45:001
2331575993428,4cyclictest1486261-21kworker/u8:2+flush-8:007:29:171
2331575993424,8cyclictest2622263-21/usr/sbin/munin12:04:161
2331575993423,9cyclictest278-21systemd-journal10:50:001
2331573993423,8cyclictest2651247-21ntpq12:29:150
2331573993420,12cyclictest2363323-21kworker/u8:0+flush-8:008:09:180
2331575993329,2cyclictest2379379-21irqrtprio07:59:041
2331575993327,4cyclictest2363323-21kworker/u8:0+flush-8:009:57:541
2331575993327,4cyclictest2363323-21kworker/u8:0+flush-8:009:57:541
2331575993323,8cyclictest2412288-21ntpq08:29:141
2331573993321,9cyclictest2532068-21apt-get10:30:010
2331580993224,6cyclictest2383039-21apt-get08:00:002
2331580993222,8cyclictest2463515-21fschecks_count09:24:042
23313442324,9sleep20-21swapper/207:09:362
2331580993125,4cyclictest2513212-21fschecks_time10:14:042
2331575993120,9cyclictest2457035-21ntpq09:14:111
2331573993123,5cyclictest0-21swapper/009:44:020
2331580993026,2cyclictest0-21swapper/209:00:002
2331580993025,3cyclictest20865-21cron12:00:002
2331580993023,5cyclictest2606862-21cron11:45:002
2331575993025,3cyclictest2343358-21systemd-run07:20:011
2331575993024,4cyclictest2497476-21cron09:55:001
2331575993023,5cyclictest2478263-21apt-get09:39:011
2331573993025,4cyclictest2363323-21kworker/u8:0+flush-8:008:34:170
2331573993024,4cyclictest2601804-21unixbench_singl11:39:200
2331573993023,5cyclictest2363323-21kworker/u8:0+flush-8:010:19:040
2331573993020,7cyclictest2657339-21/usr/sbin/munin12:39:170
2331580992924,3cyclictest2612913-21irqcore11:54:072
2331580992923,4cyclictest2403643-21aten2_r5power_e08:24:032
2331580992923,4cyclictest2372853-21unixbench_singl07:49:192
2331580992920,7cyclictest2597846-21fschecks_time11:39:042
2331580992920,7cyclictest2428626-21fschecks_count08:49:052
2331580992919,8cyclictest2422687-21unixbench_singl08:39:172
2331580992919,8cyclictest2408811-21fschecks_count08:29:052
2331575992922,5cyclictest2363323-21kworker/u8:0+flush-8:011:14:051
2331575992920,7cyclictest2417871-21latency_hist08:35:001
233157399296,18cyclictest2437667-21kworker/0:2+events09:20:190
233157399295,23cyclictest2437667-21kworker/0:2+events11:54:030
2331573992923,5cyclictest2472433-21kworker/u8:1+flush-8:012:04:340
2331573992921,5cyclictest2477708-21latency_hist09:35:010
2331573992920,7cyclictest2642493-21/usr/sbin/munin12:24:130
2331573992919,8cyclictest2501824-21ntpq09:59:120
2331573992919,8cyclictest2501824-21ntpq09:59:120
2331580992823,4cyclictest2452753-21idleruntime-cro09:10:002
2331580992822,4cyclictest2527979-21fschecks_count10:29:042
2331580992822,4cyclictest2527023-21unixbench_singl10:24:202
2331575992824,2cyclictest2492574-21turbostat.cron09:50:001
2331575992823,3cyclictest2458974-21irqrtprio09:19:071
2331575992822,4cyclictest2348150-21unixbench_singl07:24:191
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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