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2026-08-08 - 08:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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 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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot6s.osadl.org (updated Sat Aug 08, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
273367999856,56cyclictest0-21swapper/223:15:002
273367499801,2cyclictest0-21swapper/023:25:010
273367499752,39cyclictest2773591-21dropbear23:00:200
273367499731,2cyclictest0-21swapper/022:10:010
273367499722,35cyclictest2783622-21diskstats00:00:200
273367499721,41cyclictest0-21swapper/020:55:020
2733674996930,35cyclictest0-21swapper/022:40:280
273367499681,6cyclictest2756281-21latency_hist21:20:010
2733674996334,23cyclictest0-21swapper/019:15:010
2733674996313,47cyclictest2762902-21sendmail22:00:000
273367499621,56cyclictest2765136-21cut22:10:250
2733674996135,22cyclictest0-21swapper/020:20:000
273367499611,56cyclictest2786615-21grep00:15:280
273367499602,33cyclictest2778779-21memory23:30:240
273367499601,8cyclictest2765633-21apt-get22:15:130
2733674996013,43cyclictest0-21swapper/021:25:250
273367499601,32cyclictest2760641-21df_inode21:45:180
273367499601,2cyclictest2789466-21apt-get00:35:130
273367499601,2cyclictest2789466-21apt-get00:35:130
273367499592,52cyclictest2781019-21apt-get23:45:190
273367499592,52cyclictest2781019-21apt-get23:45:190
2733674995829,24cyclictest0-21swapper/021:50:280
273367499582,48cyclictest0-21swapper/022:35:020
273367499582,28cyclictest2769833-21pluginstate22:40:000
273367499581,4cyclictest2781982-21/usr/sbin/munin23:50:200
273367499581,4cyclictest2771679-21cut22:50:010
273367499581,4cyclictest2741657-21unixbench_singl19:50:290
273367499581,4cyclictest0-21swapper/021:35:300
273367499581,3cyclictest2754725-21df_inode21:10:160
273367499581,3cyclictest2738501-21diskstats19:35:180
2733679995750,4cyclictest311ktimers/220:55:012
2733674995719,34cyclictest0-21swapper/021:40:290
2733674995719,34cyclictest0-21swapper/021:40:280
273367499571,53cyclictest2747139-21/usr/sbin/munin20:25:190
273367499571,4cyclictest2746384-21ssh20:20:200
273367499571,3cyclictest2780480-21awk23:40:250
273367499571,3cyclictest2747977-21diskstats20:30:180
273367499571,3cyclictest0-21swapper/020:55:240
2733674995627,26cyclictest20850irq/208-8000000.ethernet19:25:220
273367499561,51cyclictest2787521-21head00:20:280
273367499561,4cyclictest2775359-21irqstats23:10:230
273367499561,4cyclictest2738371-21latency_hist19:35:010
273367499561,4cyclictest0-21swapper/023:05:220
273367499561,4cyclictest0-21swapper/023:05:220
273367499561,4cyclictest0-21swapper/020:45:220
273367499561,49cyclictest2736716-21latency_hist19:25:010
273367499561,48cyclictest2735795-21wc19:20:010
273367499561,3cyclictest2771851-21fschecks_time22:50:190
273367499561,2cyclictest0-21swapper/019:55:130
273367499561,10cyclictest2767721-21memory22:25:240
2733674995531,20cyclictest0-21swapper/023:20:000
273367499542,28cyclictest2744506-21diskstats20:10:190
273367499541,44cyclictest2778375-21latency_hist23:30:000
273367499541,27cyclictest0-21swapper/022:25:010
2733679995345,5cyclictest2780820-21munin-plugin-st23:44:592
273367999532,44cyclictest1660-21snmpd20:30:022
2733674995329,21cyclictest0-21swapper/021:24:590
273367499532,47cyclictest2758206-21tune2fs21:30:200
273367499532,22cyclictest2788086-21memory00:25:240
273367499532,22cyclictest2788086-21memory00:25:230
2733674995224,23cyclictest2784808-21tail00:05:250
2733674995223,25cyclictest20850irq/208-8000000.ethernet22:55:100
273367499521,7cyclictest2744286-21sort20:10:020
273367499511,6cyclictest2788731-21/usr/sbin/munin00:30:210
273367499511,4cyclictest0-21swapper/019:45:120
273367499511,2cyclictest2753170-21ssh21:00:220
273367499511,2cyclictest2753170-21ssh21:00:220
273367499511,2cyclictest0-21swapper/000:10:190
2733679995040,6cyclictest2776591-21sendmail23:20:002
273367499502,44cyclictest2742757-21apt-get20:00:140
273367499502,2cyclictest2748747-21apt-get20:35:130
273367499501,3cyclictest2763185-21diskstats22:00:190
2733679994935,11cyclictest2734475-21sh19:15:002
2733676994917,7cyclictest2768898-21apt-get22:35:011
273367499492,4cyclictest2754081-21/usr/sbin/munin21:05:220
273367499491,44cyclictest2783038-21grep23:55:250
2733679994841,5cyclictest311ktimers/222:45:022
2733679994830,14cyclictest311ktimers/223:05:112
2733679994830,14cyclictest311ktimers/223:05:112
273367499481,2cyclictest0-21swapper/020:45:000
273367499481,2cyclictest0-21swapper/019:40:240
2733676994530,9cyclictest0-21swapper/123:45:001
273367499452,8cyclictest2779615-21/usr/sbin/munin23:35:230
273367699447,3cyclictest0-21swapper/122:15:021
2733676994431,7cyclictest2744983-21grep20:10:281
2733679994335,5cyclictest2749391-21cat20:40:002
2733676994330,9cyclictest0-21swapper/100:20:291
2733674994326,15cyclictest2733636-21latency_hist19:10:000
2733676994238,2cyclictest0-21swapper/122:05:191
2733676994232,6cyclictest2785868-21cron00:15:001
2733676994228,9cyclictest0-21swapper/121:05:261
2733676994228,9cyclictest0-21swapper/100:35:301
2733676994228,9cyclictest0-21swapper/100:35:301
273367699422,33cyclictest832-21systemd-network23:05:221
273367699422,33cyclictest832-21systemd-network23:05:221
2733679994131,6cyclictest0-21swapper/223:05:002
2733676994134,4cyclictest2760276-21unixbench_multi21:40:281
2733676994134,4cyclictest2760276-21unixbench_multi21:40:281
2733679994026,7cyclictest0-21swapper/221:20:282
2733676994033,4cyclictest2744228-21cron20:10:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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