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2026-04-05 - 13:28

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 Apr 05, 2026 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1423309996610,33cyclictest0-21swapper/022:55:010
1423313996558,4cyclictest311ktimers/219:25:012
1423309996256,4cyclictest131ktimers/019:35:010
1423309996245,9cyclictest1463016-21apt-get23:00:020
1423309996245,9cyclictest1463016-21apt-get23:00:010
1423309995911,8cyclictest1424032-21tail19:10:270
1423309995847,5cyclictest1470904-21munin-plugin-st23:44:590
142330999571,4cyclictest0-21swapper/019:15:110
1423309995644,7cyclictest1455158-21munin-plugin-st22:14:590
142330999562,50cyclictest0-21swapper/023:25:260
1423313995441,8cyclictest1477618-21grep00:20:302
1423312995442,7cyclictest1438865-21grep20:35:271
1423312995417,14cyclictest1457145-21/usr/sbin/munin22:25:181
1423312995410,15cyclictest1465642-21apt-get23:15:021
1423309995247,2cyclictest0-21swapper/000:10:110
1423309995236,5cyclictest131ktimers/000:35:100
1423309995213,36cyclictest1473883-21/usr/sbin/munin00:00:220
1423309995213,36cyclictest1473883-21/usr/sbin/munin00:00:220
1423309995111,37cyclictest131ktimers/021:40:210
142330999503,44cyclictest0-21swapper/019:35:190
1423309995021,11cyclictest1467432-21apt-get23:25:020
1423312994930,13cyclictest231ktimers/122:20:121
1423309994926,18cyclictest1459074-21sh22:35:200
1423309994912,3cyclictest0-21swapper/021:20:000
1423313994837,7cyclictest1471650-21grep23:45:292
1423313994836,7cyclictest0-21swapper/220:35:282
1423313994835,6cyclictest1445022-21munin-plugin-st21:15:012
142330999489,3cyclictest1465074-21diskstats23:10:180
1423309994828,6cyclictest0-21swapper/020:15:010
1423309994825,20cyclictest20650irq/252-8000000.ethernet22:30:000
1423309994822,23cyclictest1444018-21/usr/sbin/munin21:05:290
1423313994731,10cyclictest1480236-21latency_hist00:40:012
1423313994719,18cyclictest1457796-21apt-key22:30:002
1423309994740,3cyclictest0-21swapper/000:15:270
1423309994739,4cyclictest167350irq/118-8000000.ethernet-tx020:30:000
1423309994736,8cyclictest1477595-21unixbench_singl00:20:290
1423309994733,11cyclictest0-21swapper/020:44:590
1423313994632,8cyclictest311ktimers/223:05:132
1423313994621,11cyclictest1454514-21/usr/sbin/munin22:10:182
1423309994631,9cyclictest1432969-21apt-config20:05:000
1423309994631,9cyclictest1432969-21apt-config20:05:000
142330999462,40cyclictest1426786-21ps19:25:240
1423313994534,6cyclictest1445860-21sh21:20:002
1423313994527,13cyclictest311ktimers/222:30:112
1423312994534,6cyclictest1462107-21grep22:50:281
1423312994534,6cyclictest0-21swapper/122:35:001
1423312994529,11cyclictest231ktimers/120:40:121
1423309994531,10cyclictest0-21swapper/022:05:190
1423309994529,9cyclictest0-21swapper/023:35:180
1423309994523,20cyclictest0-21swapper/022:30:250
1423313994431,8cyclictest1442247-21grep20:55:282
1423313994430,9cyclictest311ktimers/219:55:122
1423312994434,6cyclictest231ktimers/121:35:151
1423309994430,11cyclictest0-21swapper/021:50:280
1423309994428,11cyclictest0-21swapper/000:30:230
1423313994332,6cyclictest1455925-21grep22:15:292
1423313994314,14cyclictest311ktimers/220:10:132
142330999435,36cyclictest0-21swapper/021:00:170
142330999435,36cyclictest0-21swapper/021:00:170
1423309994333,6cyclictest0-21swapper/020:55:290
1423309994330,7cyclictest0-21swapper/021:35:260
1423312994226,11cyclictest231ktimers/122:10:131
1423312994223,13cyclictest231ktimers/100:20:131
142331299421,18cyclictest0-21swapper/100:00:011
1423309994235,4cyclictest167350irq/118-8000000.ethernet-tx022:00:300
1423309994235,4cyclictest0-21swapper/022:40:150
142330999423,4cyclictest1455421-21df_inode22:15:170
1423309994234,4cyclictest167350irq/118-8000000.ethernet-tx020:50:300
1423309994226,12cyclictest0-21swapper/019:50:250
142330999421,3cyclictest1429323-21awk19:40:270
1423313994134,4cyclictest0-21swapper/221:45:152
1423313994126,11cyclictest311ktimers/223:35:122
1423313994124,13cyclictest311ktimers/220:25:152
142331299417,29cyclictest22-21rcuc/123:50:201
142331299414,19cyclictest22-21rcuc/119:55:011
1423312994131,6cyclictest0-21swapper/123:00:021
1423312994130,7cyclictest0-21swapper/123:10:281
1423312994130,5cyclictest0-21swapper/121:10:001
1423312994116,21cyclictest22-21rcuc/119:20:021
142330999417,28cyclictest1463016-21apt-get23:00:020
142330999412,4cyclictest1452228-21/usr/sbin/munin21:55:220
142330999412,37cyclictest0-21swapper/022:45:210
142330999412,33cyclictest1474652-21/usr/sbin/munin00:05:220
142330999411,6cyclictest1472553-21users23:50:310
1423313994032,5cyclictest311ktimers/223:25:122
1423313994029,7cyclictest1452567-21grep21:55:282
1423313994028,8cyclictest0-21swapper/222:50:282
1423313994020,13cyclictest311ktimers/220:40:102
1423312994030,6cyclictest1460429-21grep22:40:271
1423312994029,8cyclictest0-21swapper/120:20:281
142330999406,30cyclictest1466569-21cron23:20:000
1423309994029,5cyclictest0-21swapper/019:45:260
1423309994028,6cyclictest1473444-21grep00:00:010
1423309994022,3cyclictest1456743-21/usr/sbin/munin22:20:260
1423309994021,14cyclictest0-21swapper/020:05:140
1423309994021,14cyclictest0-21swapper/020:05:130
142330999401,4cyclictest1468634-21diskstats23:30:180
142330999401,4cyclictest1447731-21cat21:30:010
142330999401,36cyclictest0-21swapper/021:45:190
1423309994012,3cyclictest1431508-21df_inode19:55:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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