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2026-09-08 - 14:27

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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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 Sep 08, 2026 00:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
69969499756,56cyclictest0-21swapper/021:45:120
699694996714,49cyclictest0-21swapper/021:35:140
69969499601,50cyclictest0-21swapper/020:05:120
69969499592,53cyclictest0-21swapper/022:50:010
69969799581,40cyclictest0-21swapper/123:30:021
69969499574,16cyclictest744122-21grep23:25:290
699694995649,4cyclictest0-21swapper/000:10:160
699694995649,4cyclictest0-21swapper/000:10:160
69969799549,21cyclictest711199-21/usr/sbin/munin20:15:201
699694995446,4cyclictest167350irq/118-8000000.ethernet-tx022:50:340
699694995412,17cyclictest12-21ksoftirqd/023:45:010
699698995242,7cyclictest746753-21munin-plugin-st23:45:002
699698995240,7cyclictest738258-21grep22:50:332
69969499521,44cyclictest12-21ksoftirqd/021:25:010
699694995126,23cyclictest14-21rcu_preempt21:10:220
699698995037,8cyclictest728952-21latency_hist22:00:022
699697995044,4cyclictest0-21swapper/121:00:011
699697994929,16cyclictest0-21swapper/121:00:211
699694994911,36cyclictest0-21swapper/019:55:160
699694994911,36cyclictest0-21swapper/019:55:160
699694994840,5cyclictest0-21swapper/022:20:010
699694994840,5cyclictest0-21swapper/022:20:010
69969499482,4cyclictest12-21ksoftirqd/022:00:010
69969499481,7cyclictest706206-21df19:45:170
699697994737,5cyclictest0-21swapper/122:05:301
699694994740,4cyclictest715225-21cat20:40:000
699694994740,4cyclictest715225-21cat20:40:000
699694994738,5cyclictest167350irq/118-8000000.ethernet-tx000:05:280
69969499472,13cyclictest729747-21grep22:00:260
69969799465,12cyclictest0-21swapper/122:50:021
699697994639,3cyclictest732382-21sendmail22:20:001
699697994639,3cyclictest732382-21sendmail22:20:001
699697994638,5cyclictest733237-21munin-plugin-st22:24:591
699698994534,6cyclictest751885-21grep00:10:312
699698994534,6cyclictest751885-21grep00:10:312
699698994533,8cyclictest710164-21munin-plugin-st20:10:002
699697994536,5cyclictest14-21rcu_preempt19:30:181
699697994532,8cyclictest735688-21unixbench_singl22:35:301
699697994532,8cyclictest0-21swapper/100:00:291
699697994531,9cyclictest0-21swapper/119:20:021
699697994528,10cyclictest0-21swapper/123:05:291
69969499458,10cyclictest15-21rcuc/021:30:000
699694994538,3cyclictest167350irq/118-8000000.ethernet-tx019:40:090
699694994535,6cyclictest721860-21grep21:15:290
699694994535,6cyclictest721860-21grep21:15:290
699694994517,26cyclictest131ktimers/023:35:220
699698994430,9cyclictest0-21swapper/219:50:292
699698994430,10cyclictest311ktimers/220:35:162
699698994430,10cyclictest311ktimers/220:35:152
69969499448,12cyclictest15-21rcuc/021:05:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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