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2026-07-15 - 08:18

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 Wed Jul 15, 2026 00:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2567991997811,53cyclictest2602488-21/usr/sbin/munin22:30:182
2567985997010,19cyclictest2611674-21apt-get23:25:020
2567991996721,36cyclictest0-21swapper/219:55:302
2567991996622,35cyclictest0-21swapper/220:25:302
2567991996622,35cyclictest0-21swapper/220:25:302
2567987996646,12cyclictest0-21swapper/122:00:011
2567985996613,14cyclictest14-21rcu_preempt22:25:010
2567991996320,33cyclictest0-21swapper/223:15:222
2567987996241,14cyclictest231ktimers/122:55:131
2567991996123,33cyclictest0-21swapper/200:10:292
2567991996120,31cyclictest0-21swapper/220:30:202
2567991996120,31cyclictest0-21swapper/220:30:202
2567991996118,35cyclictest0-21swapper/221:30:292
2567991996020,35cyclictest0-21swapper/220:35:202
2567991996019,31cyclictest0-21swapper/220:15:202
2567991996019,31cyclictest0-21swapper/220:15:202
2567991996015,6cyclictest0-21swapper/221:15:292
2567985996054,4cyclictest0-21swapper/000:20:110
2567991995934,20cyclictest2575773-21grep19:50:292
2567991995934,20cyclictest0-21swapper/220:25:002
2567991995932,22cyclictest0-21swapper/219:50:002
2567991995931,23cyclictest0-21swapper/222:10:312
2567991995927,26cyclictest0-21swapper/222:15:302
2567991995920,34cyclictest0-21swapper/200:20:222
2567991995915,5cyclictest0-21swapper/219:20:292
2567991995825,27cyclictest0-21swapper/223:25:002
2567991995817,4cyclictest0-21swapper/220:45:012
2567991995817,35cyclictest0-21swapper/221:45:282
2567991995713,38cyclictest0-21swapper/223:05:002
256799199571,25cyclictest0-21swapper/219:10:162
2567991995619,7cyclictest0-21swapper/221:55:262
2567991995618,4cyclictest0-21swapper/221:50:272
2567991995618,32cyclictest0-21swapper/223:50:222
2567991995617,5cyclictest311ktimers/222:25:212
2567991995525,27cyclictest2618713-21/usr/sbin/munin00:05:222
2567991995444,6cyclictest2586144-21munin-plugin-st20:55:002
2567991995419,29cyclictest0-21swapper/221:40:212
2567991995413,10cyclictest0-21swapper/223:40:202
256799199534,14cyclictest2573288-21cron19:40:002
256799199534,14cyclictest2573288-21cron19:40:002
2567991995326,22cyclictest2571578-21grep19:25:292
2567991995322,24cyclictest0-21swapper/221:25:292
2567991995319,3cyclictest0-21swapper/200:00:292
2567991995318,8cyclictest311ktimers/220:05:182
2567991995318,29cyclictest0-21swapper/220:05:012
2567991995318,27cyclictest0-21swapper/222:40:212
2567991995318,27cyclictest0-21swapper/222:40:212
2567991995312,6cyclictest0-21swapper/223:25:302
2567991995218,4cyclictest2603860-21grep22:35:272
2567987995243,5cyclictest2568788-21munin-plugin-st19:15:001
2567991995142,5cyclictest2613442-21munin-plugin-st23:35:002
256799199511,3cyclictest0-21swapper/221:06:082
256799199501,2cyclictest0-21swapper/200:30:022
256799199501,2cyclictest0-21swapper/200:30:012
2567985995043,4cyclictest167350irq/118-8000000.ethernet-tx021:50:240
2567987994938,6cyclictest2595495-21grep21:45:301
2567985994942,4cyclictest167350irq/118-8000000.ethernet-tx022:25:180
2567991994817,4cyclictest2572412-21head19:30:272
256799199481,19cyclictest2574045-21unixbench_multi19:40:272
2567987994839,5cyclictest2576682-21sendmail20:00:001
2567987994836,8cyclictest0-21swapper/122:30:281
2567987994836,8cyclictest0-21swapper/100:15:001
2567987994732,9cyclictest0-21swapper/123:05:231
2567987994724,18cyclictest231ktimers/121:40:151
2567987994724,16cyclictest22-21rcuc/123:55:001
2567985994735,9cyclictest15-21rcuc/021:25:130
2567985994733,10cyclictest0-21swapper/000:40:000
256798599471,40cyclictest2609149-21latency_hist23:10:010
2567991994633,9cyclictest0-21swapper/223:15:012
2567991994619,9cyclictest2579276-21sshd20:11:192
2567991994615,7cyclictest2605098-21df22:45:182
2567985994638,5cyclictest167350irq/118-8000000.ethernet-tx022:15:270
2567991994520,4cyclictest0-21swapper/200:40:002
2567991994515,7cyclictest2607338-21cron23:00:012
256799199451,23cyclictest0-21swapper/221:10:242
2567987994538,4cyclictest2581841-21munin-plugin-st20:30:001
2567987994538,4cyclictest2581841-21munin-plugin-st20:30:001
2567985994538,4cyclictest167350irq/118-8000000.ethernet-tx020:45:250
2567985994523,18cyclictest131ktimers/020:20:190
2567991994435,5cyclictest2586987-21munin-plugin-st21:00:002
2567985994437,4cyclictest167350irq/118-8000000.ethernet-tx020:05:240
2567985994437,4cyclictest167350irq/118-8000000.ethernet-tx019:40:280
2567985994436,4cyclictest167350irq/118-8000000.ethernet-tx019:30:140
256798599441,39cyclictest0-21swapper/021:35:000
256798599441,38cyclictest2570130-21latency_hist19:20:010
2567991994314,8cyclictest2593821-21cron21:40:002
2567991994310,8cyclictest0-21swapper/223:35:282
2567987994336,5cyclictest2578458-21munin-plugin-st20:10:001
2567985994336,4cyclictest167350irq/118-8000000.ethernet-tx020:30:280
2567985994336,4cyclictest167350irq/118-8000000.ethernet-tx020:30:280
2567985994335,5cyclictest20850irq/208-8000000.ethernet19:25:290
2567985994335,4cyclictest0-21swapper/020:00:230
2567985994325,16cyclictest0-21swapper/023:30:210
2567991994229,9cyclictest0-21swapper/222:50:312
2567987994234,4cyclictest0-21swapper/120:20:301
2567987994232,5cyclictest0-21swapper/119:35:281
2567987994232,5cyclictest0-21swapper/119:35:281
2567987994230,8cyclictest231ktimers/123:00:111
2567987994225,12cyclictest231ktimers/123:10:131
256798599423,6cyclictest0-21swapper/022:40:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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