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2026-07-06 - 01:50

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 Jul 05, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2584064997211,19cyclictest2602327-21/usr/sbin/munin08:55:181
258406499651,5cyclictest0-21swapper/109:40:011
258406499605,29cyclictest0-21swapper/112:00:011
2584064996050,6cyclictest2616570-21sendmail10:20:001
2584061996054,4cyclictest0-21swapper/008:25:100
2584064995542,9cyclictest0-21swapper/111:34:591
258406199543,29cyclictest15-21rcuc/010:45:020
2584064995338,12cyclictest231ktimers/107:30:121
258406199521,27cyclictest0-21swapper/009:45:000
2584064995133,12cyclictest231ktimers/111:10:121
2584064995133,12cyclictest231ktimers/111:10:121
2584064995042,5cyclictest2596218-21cat08:20:001
2584064995042,5cyclictest2596218-21cat08:20:001
2584061995032,15cyclictest167350irq/118-8000000.ethernet-tx011:45:230
2584061994920,6cyclictest2618208-21grep10:25:320
2584064994828,15cyclictest231ktimers/109:40:131
2584061994835,10cyclictest2599594-21sendmail08:39:590
2584064994735,6cyclictest2637717-21grep12:20:271
258406199472,4cyclictest0-21swapper/009:15:110
2584064994638,4cyclictest0-21swapper/110:25:211
2584064994633,9cyclictest0-21swapper/107:44:591
2584061994639,4cyclictest167350irq/118-8000000.ethernet-tx012:25:280
2584061994634,8cyclictest0-21swapper/010:20:280
2584061994631,11cyclictest0-21swapper/012:00:000
258406599456,10cyclictest0-21swapper/212:15:002
2584065994532,8cyclictest0-21swapper/212:20:282
2584065994518,9cyclictest2609717-21apt-get09:40:012
2584064994529,10cyclictest231ktimers/107:45:121
2584064994528,13cyclictest0-21swapper/110:20:281
2584064994527,12cyclictest231ktimers/109:45:111
2584064994524,15cyclictest231ktimers/111:00:131
258406199455,6cyclictest2639089-21dropbear12:30:210
2584061994537,4cyclictest167350irq/118-8000000.ethernet-tx008:30:280
2584061994535,6cyclictest2626959-21latency_hist11:20:010
2584065994435,6cyclictest2613183-21sendmail10:00:002
2584065994431,7cyclictest2587597-21grep07:25:282
2584064994427,11cyclictest231ktimers/111:50:141
2584064994427,11cyclictest231ktimers/111:50:141
2584064994425,16cyclictest231ktimers/110:00:141
2584064994425,16cyclictest231ktimers/110:00:141
2584061994437,4cyclictest167350irq/118-8000000.ethernet-tx009:20:170
258406199443,5cyclictest2623375-21users10:55:300
2584061994435,4cyclictest20650irq/252-8000000.ethernet10:15:190
2584065994337,3cyclictest14-21rcu_preempt10:35:282
2584065994333,6cyclictest0-21swapper/210:25:002
2584065994332,6cyclictest0-21swapper/210:10:282
2584065994326,11cyclictest311ktimers/209:45:142
2584064994325,13cyclictest231ktimers/107:35:131
2584064994325,13cyclictest231ktimers/107:35:131
2584064994322,15cyclictest231ktimers/112:35:141
258406499431,17cyclictest0-21swapper/110:45:011
2584061994336,4cyclictest20650irq/252-8000000.ethernet09:55:270
2584061994336,4cyclictest0-21swapper/011:55:000
2584061994336,4cyclictest0-21swapper/011:55:000
258406199431,37cyclictest0-21swapper/011:35:010
2584065994232,6cyclictest2635174-21grep12:05:282
2584065994231,7cyclictest0-21swapper/209:20:262
2584065994229,6cyclictest0-21swapper/211:55:292
2584064994229,9cyclictest0-21swapper/107:15:021
2584064994225,10cyclictest0-21swapper/107:55:201
2584064994224,14cyclictest231ktimers/110:55:141
2584061994229,8cyclictest131ktimers/011:25:120
258406199422,5cyclictest2601563-21diskstats08:50:190
2584061994223,17cyclictest0-21swapper/007:35:250
2584061994223,17cyclictest0-21swapper/007:35:250
258406199421,5cyclictest2587113-21df07:25:170
258406199421,35cyclictest2635224-21latency_hist12:10:020
2584065994117,16cyclictest0-21swapper/207:50:172
2584064994127,10cyclictest25972721/usr/sbin/munin08:25:181
2584064994123,13cyclictest231ktimers/109:05:121
2584061994136,2cyclictest0-21swapper/007:15:000
2584061994135,4cyclictest167350irq/118-8000000.ethernet-tx010:36:580
258406199413,4cyclictest2603737-21grep09:00:290
2584061994132,4cyclictest20650irq/252-8000000.ethernet09:05:300
258406199412,4cyclictest2591361-21/usr/sbin/munin07:50:090
258406199412,36cyclictest0-21swapper/008:05:150
2584065994032,5cyclictest311ktimers/211:55:022
2584065994032,5cyclictest311ktimers/211:55:012
2584065994029,7cyclictest2638572-21grep12:25:292
2584065994029,6cyclictest0-21swapper/208:15:282
2584065994029,6cyclictest0-21swapper/208:15:272
2584065994028,8cyclictest311ktimers/209:00:172
2584064994027,8cyclictest0-21swapper/109:00:291
2584064994021,13cyclictest231ktimers/110:35:151
2584061994027,8cyclictest0-21swapper/009:50:280
2584061994025,9cyclictest0-21swapper/012:15:010
258406199402,4cyclictest2593319-21irqstats08:00:240
2584061994024,14cyclictest0-21swapper/009:10:260
2584061994024,14cyclictest0-21swapper/009:10:260
258406199401,8cyclictest2602975-21sendmail09:00:000
2584061994016,22cyclictest2612327-21kworker/u8:2-events_power_efficient10:00:260
2584061994016,22cyclictest2612327-21kworker/u8:2-events_power_efficient10:00:250
258406199401,37cyclictest0-21swapper/011:05:130
2584065993933,4cyclictest14-21rcu_preempt09:40:192
2584065993931,4cyclictest0-21swapper/208:45:292
2584065993928,7cyclictest0-21swapper/207:40:302
2584065993927,5cyclictest0-21swapper/208:30:282
2584065993925,8cyclictest0-21swapper/212:30:292
2584065993924,9cyclictest0-21swapper/210:25:212
2584065993923,9cyclictest311ktimers/211:00:152
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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