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2026-03-14 - 18:49

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 Sat Mar 14, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
124522590,3sleep01241-21ntpq09:45:190
3252222400,3sleep032520-21grep09:40:240
1401122400,3sleep014012-21if_eth010:35:160
2965621220,3sleep029657-21ntpq11:35:190
388121150,2chrt3878-21irqstats07:50:170
2302821130,3chrt23029-21latency_hist09:05:010
2584421110,4sleep025541-21/usr/sbin/munin11:20:240
1777321040,3sleep017823-21df10:50:120
644321010,4sleep06501-21grep12:10:270
1541121000,3sleep015424-21/usr/sbin/munin08:35:140
14982900,4sleep01567-21awk07:40:260
296402890,4sleep029666-21ls09:30:140
76182874,8sleep07663-21/usr/sbin/munin08:05:120
311672840,3sleep031216-21ps09:35:270
113692840,3sleep011371-21modprobe08:20:000
72172784,62sleep0288-21snmpd08:02:470
261312764,7sleep026149-21ntp_states07:10:200
77572750,3sleep07832-21cut10:10:230
2475127421,30sleep024755-21/usr/sbin/munin07:05:180
62092724,56sleep06213-21df10:05:120
184612714,55sleep018533-21users08:45:280
51582695,52sleep05156-21ntp_states10:00:220
25765996426,14cyclictest17519-21runrttasks10:49:030
25765996237,15cyclictest2371-21/usr/sbin/munin11:55:190
2576599609,15cyclictest28111-21/usr/sbin/munin11:30:250
25765996020,16cyclictest32017-21runrttasks07:33:370
25765996010,18cyclictest12737-21if_eth010:30:160
25765996010,17cyclictest5208-21memory07:55:200
2576599599,17cyclictest16367-21munin-run10:45:010
25765995933,17cyclictest31186-21/usr/sbin/munin11:40:260
25765995922,12cyclictest23054-21if_eth011:10:140
25765995910,16cyclictest10328-21ntp_states10:20:200
2576599589,18cyclictest29894-21irqstats07:25:160
2576599589,17cyclictest5115-21systemctl12:05:250
2576599589,15cyclictest24402-21/usr/sbin/munin09:10:300
25765995834,16cyclictest24267-21/usr/sbin/munin11:15:100
25765995830,16cyclictest13550-21runrttasks12:39:460
2576599579,16cyclictest11326-21/usr/sbin/munin10:25:240
2576599578,17cyclictest19052-21/usr/sbin/munin10:55:270
2576599578,16cyclictest3408-21/usr/sbin/munin12:00:200
25765995732,16cyclictest11145-21/usr/sbin/munin12:30:100
25765995731,16cyclictest28483-21/usr/sbin/munin09:25:170
25765995728,18cyclictest20720-21/usr/sbin/munin11:00:260
25765995721,12cyclictest16755-21idleruntime08:40:150
25765995712,15cyclictest32500-21/usr/sbin/munin11:45:250
2576599569,19cyclictest32384-21chrt07:35:150
2576599569,15cyclictest9931-21/usr/sbin/munin12:25:140
2576599569,14cyclictest21940-21ntp_states11:05:220
2576599568,15cyclictest28446-21sed07:20:020
2576599568,14cyclictest27154-21irqstats09:20:160
2576599567,16cyclictest28470-21/usr/sbin/munin07:20:150
25765995631,17cyclictest8644-21/usr/sbin/munin12:20:140
25765995630,16cyclictest8978-21/usr/sbin/munin08:10:130
25765995616,12cyclictest9275-21timerwakeupswit10:15:250
2576599559,15cyclictest3561-21/usr/sbin/munin09:55:250
2576599559,13cyclictest25951-21ntpq09:15:190
2576599558,18cyclictest20989-21awk08:55:260
2576599558,16cyclictest3616-21munin-run07:50:010
2576599558,15cyclictest11694-21memory08:20:180
2576599558,14cyclictest7449-21/usr/sbin/munin12:15:160
2576599555,20cyclictest2275-21cpu09:50:090
2576599555,17cyclictest13632-21seq08:27:280
25765995530,17cyclictest26891-21/usr/sbin/munin11:25:130
25765995530,17cyclictest23954-21runrttasks09:07:250
25765995431,15cyclictest19821-21/usr/sbin/munin08:50:280
25765995427,17cyclictest1605-21runrttasks11:52:010
2576599538,13cyclictest14140-21/usr/sbin/munin08:30:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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