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2026-05-15 - 02:43

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 Thu May 14, 2026 12:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27907539910659,38cyclictest391ktimers/307:50:003
27907499910695,4cyclictest22-21rcuc/112:30:011
2790753991057,13cyclictest2837805-21apt-get11:45:013
279074899877,9cyclictest2837971-21gpg-connect-age11:45:010
2790748998116,55cyclictest0-21swapper/011:35:210
2790748998116,55cyclictest0-21swapper/011:35:210
2790748998037,38cyclictest0-21swapper/009:35:260
279074899781,68cyclictest2796977-21grep07:40:280
279074899781,68cyclictest2796977-21grep07:40:280
2790748997731,40cyclictest0-21swapper/009:45:260
279074899771,3cyclictest2845971-21sed12:30:210
279074899751,68cyclictest2819761-21/usr/sbin/munin09:55:280
279074899751,4cyclictest2823869-21/usr/sbin/munin10:20:240
2790748997340,30cyclictest2839579-21munin-plugin-st11:55:000
2790748997340,30cyclictest2839579-21munin-plugin-st11:55:000
279074899731,64cyclictest2813748-21/usr/sbin/munin09:20:270
279074899722,62cyclictest2827580-21sed10:40:280
279074899721,3cyclictest0-21swapper/010:50:020
279074899711,64cyclictest2824208-21apt-get10:25:040
279074899711,63cyclictest2841581-21fschecks_count12:05:190
279074899703,58cyclictest0-21swapper/011:00:190
2790748997029,35cyclictest0-21swapper/012:20:280
279074899701,3cyclictest2800257-21/usr/sbin/munin08:00:260
279074899691,2cyclictest2792677-21apt-get07:20:060
279074899681,2cyclictest0-21swapper/010:55:010
279074899672,4cyclictest2834089-21meminfo11:20:230
2790748996720,5cyclictest2797845-21grep07:45:260
279074899671,64cyclictest2814823-21apt-get09:30:050
279074899655,56cyclictest0-21swapper/007:30:190
279074899653,3cyclictest2792385-21phc2sys-jitter07:15:270
279074899651,4cyclictest2803000-21munin-run08:20:000
2790748996437,24cyclictest2806163-21dropbear08:35:280
2790748996432,27cyclictest2799557-21grep07:55:290
279074899642,4cyclictest2821283-21irqstats10:05:210
279074899641,4cyclictest2825408-21diskstats10:30:180
2790748996332,26cyclictest0-21swapper/008:30:280
279074899631,5cyclictest2813098-21users09:15:290
279074899631,59cyclictest2835772-21memory11:30:240
2790748996227,26cyclictest0-21swapper/011:10:230
279074899621,5cyclictest2794090-21irqstats07:25:230
279074899621,3cyclictest2829615-21df10:55:180
279074899621,3cyclictest2829615-21df10:55:170
279074899621,3cyclictest2804680-21sshd08:28:430
279074899621,2cyclictest0-21swapper/011:20:000
2790748996118,4cyclictest0-21swapper/012:15:260
2790748996118,4cyclictest0-21swapper/012:15:260
279074899611,57cyclictest2838097-21apt11:45:110
279074899611,54cyclictest0-21swapper/009:25:130
2790748996110,9cyclictest0-21swapper/008:15:010
279074899604,53cyclictest2831774-21unixbench_multi11:05:270
279074899601,56cyclictest2845272-21ptp4l12:25:250
279074899601,56cyclictest2826816-21latency_hist10:40:000
279074899601,56cyclictest2795603-21grep07:35:150
279074899601,3cyclictest2834929-21meminfo11:25:240
279074899601,2cyclictest2811646-21apt-get09:10:150
279074899591,55cyclictest2846654-21ssh12:35:200
279074899591,22cyclictest2822635-21sort10:15:010
279074899583,4cyclictest2808538-21kernelversion08:50:230
279074899581,55cyclictest0-21swapper/009:00:210
279074899581,4cyclictest2807685-21irqstats08:45:220
279074899581,46cyclictest0-21swapper/009:05:110
279074899573,15cyclictest20850irq/208-8000000.ethernet12:00:150
279074899571,5cyclictest2803854-21munin-run08:25:000
279074899571,5cyclictest2803854-21munin-run08:25:000
279074999555,20cyclictest22-21rcuc/107:15:011
279074999555,20cyclictest22-21rcuc/107:15:011
279074899551,3cyclictest2818539-21df09:50:140
279075299546,29cyclictest30-21rcuc/209:30:012
279075299541,31cyclictest0-21swapper/211:35:002
279074899541,47cyclictest0-21swapper/010:05:020
279074899541,47cyclictest0-21swapper/010:05:020
279074899541,26cyclictest0-21swapper/007:50:170
279074899541,13cyclictest0-21swapper/012:15:010
279074899532,5cyclictest1258-21in:imuxsock10:15:430
2790748995325,24cyclictest0-21swapper/007:10:300
2790748995325,24cyclictest0-21swapper/007:10:290
2790748995316,4cyclictest0-21swapper/011:55:190
2790748995230,19cyclictest20850irq/208-8000000.ethernet08:05:290
2790752995133,14cyclictest0-21swapper/211:20:002
279074899511,9cyclictest0-21swapper/007:10:000
279074899511,48cyclictest0-21swapper/009:40:210
279074899511,2cyclictest2809109-21apt-get08:55:120
2790752995026,14cyclictest311ktimers/210:05:082
279075299501,33cyclictest0-21swapper/208:10:022
279075299501,31cyclictest0-21swapper/212:30:012
2790749995033,11cyclictest0-21swapper/110:30:001
279075299496,13cyclictest32-21ksoftirqd/209:30:022
2790752994729,14cyclictest311ktimers/210:00:092
2790752994729,14cyclictest311ktimers/210:00:092
279075299471,23cyclictest0-21swapper/210:40:002
279074999471,3cyclictest0-21swapper/110:50:011
2790749994636,6cyclictest2796191-21grep07:35:271
279074899461,3cyclictest2807226-21munin-run08:45:000
2790752994532,9cyclictest0-21swapper/207:15:002
2790752994532,9cyclictest0-21swapper/207:15:002
279075299453,22cyclictest0-21swapper/211:55:022
279075299453,22cyclictest0-21swapper/211:55:022
279074999455,5cyclictest0-21swapper/109:40:011
2790749994524,13cyclictest231ktimers/108:25:161
2790749994433,5cyclictest0-21swapper/110:55:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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