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2026-11-03 - 20:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, 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: 50 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 rack4slot6s.osadl.org (updated Tue Nov 03, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1757822500,2sleep017580-21latency08:50:150
85222090,3sleep0850-21grep11:55:280
720322040,2sleep07204-21basename08:10:140
2805421310,3chrt27777-21/usr/sbin/munin09:30:190
3087021300,3chrt30871-21switchtime09:40:270
1984521260,4chrt19846-21/usr/sbin/munin11:05:080
1198421210,3chrt11981-21grep10:35:010
1740721010,3sleep017438-21memory10:55:180
305512970,3sleep030572-21ls07:35:160
100582960,3sleep010122-21mailstats08:20:250
257142950,3sleep025716-21switchtime09:20:270
278342890,2sleep027833-21sort07:25:020
252472870,3sleep025289-21ntp_kernel_pll_11:25:210
67912810,2sleep06826-21cat10:15:000
319612770,3sleep032037-21timerwakeupswit11:50:290
2284227419,31sleep022876-21irqstats07:05:160
93912724,59sleep09406-21munin-run10:25:000
10522725,53sleep00-21swapper07:45:250
2393299629,19cyclictest14866-21/usr/sbin/munin08:40:260
104122623,47sleep00-21swapper12:34:270
2393299619,14cyclictest4218-21df12:10:140
23932996133,17cyclictest7953-21latency_hist12:25:020
23932996110,16cyclictest18560-21/usr/sbin/munin11:00:190
2393299608,16cyclictest28211-21ntp_states07:25:230
23932996029,21cyclictest26189-21runrttasks07:17:370
2393299599,18cyclictest30179-21/usr/sbin/munin11:45:190
2393299599,15cyclictest21133-21/usr/sbin/munin11:10:310
2393299589,17cyclictest21836-21grep09:05:300
2393299589,15cyclictest27588-21/usr/sbin/munin11:35:190
2393299589,15cyclictest12093-21/usr/sbin/munin10:35:180
2393299588,16cyclictest13705-21/usr/sbin/munin08:35:180
2393299588,16cyclictest12275-21/usr/sbin/munin08:30:130
23932995833,17cyclictest8448-21/usr/sbin/munin08:15:130
23932995819,15cyclictest65972chrt08:07:140
23932995817,14cyclictest276-21runrttasks09:47:170
23932995810,15cyclictest29639-21runrttasks07:30:260
2393299579,15cyclictest23882-21irqstats11:20:170
2393299578,18cyclictest24036-21/usr/sbin/munin07:10:260
2393299578,18cyclictest16150-21/usr/sbin/munin08:45:250
2393299578,17cyclictest757-21ntpq09:50:220
2393299578,17cyclictest1760-21/usr/sbin/munin09:55:220
2393299576,18cyclictest15965-21/usr/sbin/munin10:50:110
23932995733,15cyclictest11028-21/usr/sbin/munin12:35:270
23932995731,16cyclictest7367-21/usr/sbin/munin10:15:260
23932995731,16cyclictest29002-21/usr/sbin/munin11:40:140
23932995725,21cyclictest4508-21sshd10:05:180
23932995717,15cyclictest24542chrt12:02:320
23932995710,16cyclictest3183-21/usr/sbin/munin07:55:260
2393299569,16cyclictest14495-21sshd10:44:340
2393299569,15cyclictest26687-21sshd09:25:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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