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2026-05-08 - 06:23

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Fri May 08, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
754722360,3sleep07544-21grep21:25:270
2762521630,2sleep027627-21latency_hist22:45:020
571621320,3sleep05717-21latency_hist21:20:040
3087421240,4chrt30873-21mailstats20:50:270
3021221100,3chrt30213-21cut22:55:020
57752970,4sleep05825-21/usr/sbin/munin21:20:120
293142940,3sleep029321-21missed_timers20:45:190
83462935,11sleep08395-21df21:30:120
188592930,3sleep018892-21/usr/sbin/munin22:10:210
288542926,9sleep028870-21munin-run22:50:000
84162890,3sleep08417-21ntpq23:35:200
200282895,10sleep020073-21if_eth022:15:170
46772820,2sleep04678-21basename19:10:150
72892800,2sleep07291-21awk23:30:270
238282735,55sleep023829-21sshd22:30:100
339527219,31sleep03428-21irqstats19:05:140
4487996422,15cyclictest9880-21cat23:40:260
4487996210,19cyclictest4303-21/usr/sbin/munin23:20:140
448799619,20cyclictest3120-21/usr/sbin/munin21:10:260
448799609,18cyclictest25247-21/usr/sbin/munin20:30:150
448799608,19cyclictest31689-21/usr/sbin/munin20:55:250
4487996011,16cyclictest9895-21ntpq21:35:200
448799599,15cyclictest21083-21/usr/sbin/munin00:25:200
4487995935,14cyclictest12697-21/usr/sbin/munin21:45:280
4487995932,16cyclictest20135-21/usr/sbin/munin00:20:270
4487995924,13cyclictest27024-21/usr/sbin/munin20:35:260
4487995911,16cyclictest1882-21df21:05:120
448799589,16cyclictest8439-21wc19:25:020
448799589,15cyclictest12349-21/usr/sbin/munin19:40:280
448799588,21cyclictest23052-21sshd00:31:100
448799588,17cyclictest16452-21tr19:55:200
4487995810,16cyclictest23849-21modprobe20:25:000
448799579,19cyclictest5591-21/usr/sbin/munin23:25:210
448799579,16cyclictest22544-21awk20:20:010
448799579,15cyclictest17693-21memory20:00:160
448799578,17cyclictest15956-21awk22:00:000
4487995734,16cyclictest23601-21runrttasks22:29:100
4487995711,17cyclictest12098-21awk21:45:000
448799569,14cyclictest1702-21/usr/sbin/munin23:10:150
448799568,16cyclictest5876-21/usr/sbin/munin19:15:180
448799568,15cyclictest16090-21/usr/sbin/munin22:00:170
448799568,14cyclictest8474-21/usr/sbin/munin19:25:190
4487995633,15cyclictest19062-21/usr/sbin/munin20:05:190
4487995631,16cyclictest20080-21/usr/sbin/munin20:10:100
4487995631,15cyclictest28428-21/usr/sbin/munin20:40:280
4487995630,17cyclictest14885-21/usr/sbin/munin00:00:210
4487995630,16cyclictest1170-21runrttasks23:06:440
4487995629,17cyclictest11243-21/usr/sbin/munin23:45:270
448799559,16cyclictest23965-21/usr/sbin/munin20:25:130
448799559,15cyclictest9808-21/usr/sbin/munin19:30:120
448799559,15cyclictest18481-21/usr/sbin/munin00:15:170
448799559,12cyclictest16120-21sed00:05:170
448799558,15cyclictest31636-21df23:00:100
448799558,15cyclictest14914-21/usr/sbin/munin19:50:250
448799558,14cyclictest13927-21ntp_states19:45:240
448799557,15cyclictest13501-21/usr/sbin/munin21:50:270
4487995530,17cyclictest24577-21runrttasks00:38:110
4487995529,16cyclictest13909-21/usr/sbin/munin23:55:300
4487995510,15cyclictest12025-21/usr/sbin/munin23:50:140
448799549,18cyclictest30401-21if_eth022:55:150
448799548,15cyclictest21320-21sh22:20:120
448799548,14cyclictest4137-21cron23:20:000
4487995431,15cyclictest18439-21runrttasks22:09:140
4487995430,17cyclictest17264-21/usr/sbin/munin00:10:140
4487995410,15cyclictest794-21ntpq21:00:200
4487995331,15cyclictest25113-21runrttasks22:35:090
4487995311,17cyclictest11183-21irqstats19:35:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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