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2026-07-28 - 15:04

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 50 highest latencies:
System rackeslot6s.osadl.org (updated Tue Jul 28, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
146013999105100,2cyclictest0-21swapper/000:40:010
1460139991016,36cyclictest20850irq/208-8000000.ethernet21:35:010
1460145998073,4cyclictest391ktimers/319:20:183
1460144995918,18cyclictest30-21rcuc/220:45:012
146014199582,17cyclictest14-21rcu_preempt20:20:011
146014199557,10cyclictest1484213-21apt-get21:30:021
146014199541,21cyclictest0-21swapper/123:05:021
146014499534,12cyclictest1500441-21apt-get23:05:012
1460141995226,21cyclictest1475779-21cat20:40:011
1460141995140,7cyclictest1482523-21munin-plugin-st21:19:591
1460144995037,10cyclictest1475678-21munin-plugin-st20:40:012
146014199501,31cyclictest22-21rcuc/120:55:011
1460141994933,12cyclictest231ktimers/121:30:081
1460141994928,14cyclictest22-21rcuc/119:50:011
146013999496,5cyclictest0-21swapper/020:10:000
1460139994929,17cyclictest1466957-21sendmail_mailst19:45:270
1460139994929,17cyclictest1466957-21sendmail_mailst19:45:270
1460144994842,3cyclictest1492747-21sendmail22:20:002
146013999483,38cyclictest0-21swapper/000:00:020
1460141994722,15cyclictest231ktimers/119:35:011
1460139994740,4cyclictest167350irq/118-8000000.ethernet-tx019:40:240
1460139994738,6cyclictest1475679-21sendmail20:40:000
1460144994636,6cyclictest1462890-21grep19:20:282
1460141994636,7cyclictest0-21swapper/100:25:001
1460139994639,4cyclictest167350irq/118-8000000.ethernet-tx023:50:170
1460139994637,5cyclictest1499397-21grep22:55:300
1460144994535,6cyclictest1479934-21grep21:00:312
1460144994533,5cyclictest0-21swapper/222:50:192
1460144994510,7cyclictest0-21swapper/219:40:012
146014199454,20cyclictest24-21ksoftirqd/122:30:011
1460141994536,5cyclictest0-21swapper/122:40:281
1460139994538,4cyclictest20850irq/208-8000000.ethernet00:20:270
146013999452,4cyclictest1494100-21meminfo22:25:260
1460141994435,6cyclictest1470461-21unixbench_singl20:05:291
1460141994429,9cyclictest0-21swapper/119:55:321
1460139994437,4cyclictest167350irq/118-8000000.ethernet-tx000:25:160
1460139994436,4cyclictest15-21rcuc/000:10:010
1460139994435,5cyclictest14-21rcu_preempt21:45:000
1460139994428,14cyclictest167350irq/118-8000000.ethernet-tx023:30:130
146013999441,5cyclictest0-21swapper/021:20:000
146013999441,37cyclictest0-21swapper/000:05:020
1460144994330,8cyclictest1508155-21grep23:45:292
1460144994330,8cyclictest1508155-21grep23:45:292
1460144994330,8cyclictest0-21swapper/222:20:272
1460144994326,6cyclictest0-21swapper/220:10:282
1460144994317,14cyclictest311ktimers/200:00:152
1460144994313,24cyclictest0-21swapper/222:05:222
1460141994332,8cyclictest1513284-21sendmail00:20:001
1460141994328,8cyclictest0-21swapper/119:45:001
1460141994326,13cyclictest231ktimers/120:55:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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