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2026-06-16 - 11:23

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 Jun 16, 2026 00:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2126464998411,9cyclictest170091ptp4l20:40:063
2126458996115,15cyclictest23850irq/422-mmc120:45:020
212646099552,34cyclictest0-21swapper/120:30:011
212646099552,34cyclictest0-21swapper/120:30:011
2126458995348,2cyclictest0-21swapper/000:00:010
212645899531,35cyclictest0-21swapper/023:15:010
2126463995244,4cyclictest2164222-21munin-plugin-st22:50:002
2126463995115,20cyclictest2169502-21/usr/sbin/munin23:20:172
2126458995135,11cyclictest2182820-21grep00:35:290
212645899511,5cyclictest2164846-21ptp4l-jitter22:50:260
212645899511,5cyclictest2164846-21ptp4l-jitter22:50:260
2126463995042,5cyclictest2162524-21sendmail22:39:592
2126463995023,4cyclictest0-21swapper/221:35:012
2126460995031,16cyclictest231ktimers/121:05:011
2126460995031,16cyclictest231ktimers/121:05:011
2126458995026,20cyclictest2141543-21grep20:35:290
2126458995026,20cyclictest2141543-21grep20:35:290
2126460994933,11cyclictest0-21swapper/123:30:311
2126460994933,11cyclictest0-21swapper/123:30:311
2126458994839,5cyclictest0-21swapper/000:30:190
212645899481,31cyclictest0-21swapper/000:30:010
212645899481,31cyclictest0-21swapper/000:30:010
2126460994736,7cyclictest2148000-21munin-plugin-st21:15:001
2126458994737,6cyclictest0-21swapper/020:55:190
212645899471,29cyclictest0-21swapper/020:05:010
212645899471,19cyclictest0-21swapper/023:20:010
2126463994636,5cyclictest0-21swapper/223:15:002
2126463994629,6cyclictest0-21swapper/220:30:212
212646099465,21cyclictest22-21rcuc/119:40:011
2126460994634,7cyclictest0-21swapper/122:25:291
2126458994639,4cyclictest167350irq/118-8000000.ethernet-tx019:20:160
2126458994635,5cyclictest20850irq/208-8000000.ethernet19:15:020
2126458994632,9cyclictest0-21swapper/021:40:280
2126458994632,9cyclictest0-21swapper/021:40:280
2126458994612,17cyclictest2131127-21/usr/sbin/munin19:35:190
2126463994535,6cyclictest2158119-21grep22:10:282
2126463994532,8cyclictest0-21swapper/200:20:002
2126463994532,6cyclictest2159111-21grep22:15:292
2126460994539,4cyclictest231ktimers/119:30:001
2126460994531,9cyclictest0-21swapper/123:00:291
2126458994537,4cyclictest167350irq/118-8000000.ethernet-tx022:05:180
2126458994536,5cyclictest167350irq/118-8000000.ethernet-tx022:00:250
2126458994534,6cyclictest0-21swapper/021:55:270
2126458994533,8cyclictest0-21swapper/021:15:290
2126458994533,7cyclictest0-21swapper/022:20:290
212645899451,4cyclictest0-21swapper/022:35:120
2126463994431,9cyclictest0-21swapper/222:20:172
2126463994430,9cyclictest0-21swapper/219:50:202
2126463994430,8cyclictest0-21swapper/222:00:272
2126460994434,7cyclictest2164978-21unixbench_multi22:50:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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