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2026-05-24 - 09:31

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 Sun May 24, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
279373599824,70cyclictest2805585-21phc2sys-jitter20:15:280
2793735998142,34cyclictest20650irq/252-8000000.ethernet23:25:260
2793735997833,36cyclictest0-21swapper/000:00:010
2793738997331,37cyclictest2833859-21grep23:00:281
2793738997235,33cyclictest2799899-21munin-plugin-st19:45:001
2793738997144,21cyclictest0-21swapper/119:15:011
2793735997132,35cyclictest2847898-21munin-plugin-st00:25:000
279373599703,7cyclictest2817808-21unixbench_multi21:25:290
2793738996934,29cyclictest0-21swapper/122:00:001
2793735996945,20cyclictest167350irq/118-8000000.ethernet-tx000:05:020
2793738996812,49cyclictest2818934-21/usr/sbin/munin21:35:181
2793735996738,24cyclictest20650irq/252-8000000.ethernet19:20:210
2793735996638,24cyclictest20650irq/252-8000000.ethernet22:30:110
2793735996613,3cyclictest2834963-21latency_hist23:10:010
2793735996537,25cyclictest20650irq/252-8000000.ethernet20:40:010
2793735996529,29cyclictest2803269-21apt-get20:05:050
2793735996528,32cyclictest0-21swapper/021:35:280
279373599651,61cyclictest2830968-21fw_packets22:45:250
2793739996430,11cyclictest30-21rcuc/220:40:012
279373999641,27cyclictest0-21swapper/219:20:012
2793738996420,34cyclictest0-21swapper/122:20:281
2793735996433,26cyclictest2850425-21cron00:40:000
2793738996337,21cyclictest0-21swapper/122:40:281
2793738996326,30cyclictest0-21swapper/120:55:271
2793735996336,23cyclictest20650irq/252-8000000.ethernet20:00:120
2793735996330,28cyclictest2833076-21cron23:00:000
279373599632,9cyclictest2796902-21/usr/sbin/munin19:25:210
279373599632,7cyclictest2844832-21tune2fs00:05:200
2793735996234,23cyclictest274-21systemd-journal20:40:200
2793735996233,26cyclictest20850irq/208-8000000.ethernet19:15:010
2793735996229,28cyclictest0-21swapper/019:40:280
279373899613,13cyclictest2809568-21/usr/sbin/munin20:40:191
2793738996118,37cyclictest0-21swapper/119:25:021
2793735996149,7cyclictest0-21swapper/023:30:210
2793735996149,7cyclictest0-21swapper/023:30:210
2793735996129,28cyclictest2822956-21munin-run22:00:000
279373599612,6cyclictest2795664-21sendmail19:20:000
279373599611,55cyclictest2802407-21cron20:00:000
2793738996010,40cyclictest0-21swapper/120:25:211
279373599601,55cyclictest2821531-21sh21:50:160
2793738995925,27cyclictest0-21swapper/121:00:221
2793738995922,33cyclictest0-21swapper/123:15:261
2793738995917,33cyclictest0-21swapper/122:15:291
2793738995914,37cyclictest0-21swapper/100:15:301
279373599594,51cyclictest0-21swapper/022:40:230
2793735995936,18cyclictest20650irq/252-8000000.ethernet22:00:200
2793735995935,20cyclictest20650irq/252-8000000.ethernet00:10:260
279373599592,5cyclictest2800397-21meminfo19:45:260
2793735995918,38cyclictest2807614-21grep20:25:280
279373599591,5cyclictest2797995-21/usr/sbin/munin19:30:270
2793738995817,35cyclictest2837954-21ssh23:25:201
2793738995817,33cyclictest0-21swapper/121:50:001
2793735995837,16cyclictest20650irq/252-8000000.ethernet20:30:200
2793735995834,16cyclictest20650irq/252-8000000.ethernet21:05:030
2793735995825,29cyclictest2813696-21latency_hist21:05:010
2793735995824,28cyclictest0-21swapper/021:30:190
2793735995824,28cyclictest0-21swapper/021:30:190
2793739995740,11cyclictest311ktimers/219:30:122
279373899574,45cyclictest2808475-21unixbench_singl20:30:281
2793738995736,16cyclictest0-21swapper/100:00:001
2793738995725,25cyclictest2843874-21/usr/sbin/munin00:00:161
2793738995725,24cyclictest0-21swapper/100:35:301
2793738995723,27cyclictest2835599-21grep23:10:281
2793738995720,29cyclictest0-21swapper/123:45:271
2793738995719,29cyclictest0-21swapper/119:15:221
2793735995736,16cyclictest20650irq/252-8000000.ethernet21:45:270
2793735995733,21cyclictest20650irq/252-8000000.ethernet23:40:230
2793735995732,20cyclictest2831776-21dropbear22:50:210
2793735995732,20cyclictest2831776-21dropbear22:50:210
279373599573,10cyclictest2837492-21apt-get23:25:020
279373599573,10cyclictest2837492-21apt-get23:25:010
279373599571,3cyclictest2812162-21diskstats20:55:180
2793739995624,23cyclictest30-21rcuc/220:05:012
2793738995627,23cyclictest0-21swapper/121:25:291
2793738995624,25cyclictest0-21swapper/121:05:291
2793735995639,14cyclictest0-21swapper/021:20:260
2793735995634,19cyclictest20650irq/252-8000000.ethernet23:00:280
2793735995634,18cyclictest20650irq/252-8000000.ethernet23:50:250
2793735995634,18cyclictest20650irq/252-8000000.ethernet23:10:250
2793735995624,29cyclictest2801410-21grep19:50:280
2793735995618,35cyclictest0-21swapper/000:25:300
2793735995618,35cyclictest0-21swapper/000:25:300
279373599561,53cyclictest0-21swapper/022:25:260
279373599561,3cyclictest2836188-21ssh23:15:230
279373599561,3cyclictest2825285-21gzip22:10:260
279373599561,3cyclictest2825285-21gzip22:10:260
279373899555,33cyclictest0-21swapper/122:05:011
279373899552,11cyclictest2840088-21grep23:35:281
279373899551,48cyclictest0-21swapper/100:25:241
279373899551,48cyclictest0-21swapper/100:25:241
2793735995536,15cyclictest20650irq/252-8000000.ethernet23:45:270
2793735995530,22cyclictest0-21swapper/020:25:000
2793735995523,27cyclictest0-21swapper/019:35:280
2793739995419,9cyclictest30-21rcuc/223:40:192
2793739995414,17cyclictest2848951-21/usr/sbin/munin00:30:192
279373899542,7cyclictest2834315-21cut23:05:201
2793738995424,24cyclictest2810946-21grep20:45:281
2793738995422,25cyclictest0-21swapper/122:55:201
2793738995418,29cyclictest2814872-21cut21:10:211
2793738995415,32cyclictest0-21swapper/122:45:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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