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2026-06-18 - 20:42

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Thu Jun 18, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2621822480,3sleep026216-21grep07:15:270
2852022430,3sleep028519-21wc11:35:280
502021590,6sleep05018-21grep10:05:200
223521250,4chrt2234-21/usr/sbin/munin09:55:150
1646421210,4chrt16466-21if_err_eth010:50:140
1219521170,4chrt12198-21tr12:40:000
860121140,4chrt8602-21latency12:25:170
906321100,3sleep09061-21ntp_states08:15:230
1513921060,3sleep015075-21/usr/sbin/munin10:45:140
1763921050,3sleep017689-21df10:55:110
1582321030,3sleep015825-21sort08:40:270
2434521020,2sleep024343-21ls07:10:020
190182990,5sleep018951-21/usr/sbin/munin11:00:140
287092970,4sleep028775-21awk07:25:280
320522920,4sleep032074-21latency_hist07:40:010
18242900,4sleep01847-21idleruntime-cro12:00:000
230562860,3sleep023095-21if_err_eth009:10:140
299262760,2sleep029924-21switchtime09:35:260
325402738,12sleep0288-21snmpd11:51:090
24308997043,18cyclictest6173-21/usr/sbin/munin10:10:150
24308997019,26cyclictest7348-21/usr/sbin/munin12:20:150
24308996438,16cyclictest4805-21grep08:00:020
24308996438,14cyclictest7779-21/usr/sbin/munin08:10:220
24308996331,22cyclictest30617-21/usr/sbin/munin11:45:100
24308996240,13cyclictest27218-21/usr/sbin/munin07:20:180
24308996237,15cyclictest26883-21seq11:30:170
24308996235,17cyclictest4678-21wc10:05:020
24308996235,16cyclictest29352-21df_inode11:40:130
24308996137,15cyclictest344-21users07:40:290
24308996136,12cyclictest23671-21chrt11:17:340
24308996135,15cyclictest14383-21users10:40:300
24308996134,18cyclictest9556-21sshd10:23:070
24308996134,17cyclictest29805-21/usr/sbin/munin07:30:180
24308996133,17cyclictest4850-21ntp_states12:10:210
2430899608,19cyclictest30758-21/usr/sbin/munin09:40:180
24308996040,13cyclictest20222-21runrttasks08:59:490
24308996035,15cyclictest21991-21ntp_states09:05:220
24308996035,15cyclictest11688-21/usr/sbin/munin08:25:230
24308996033,16cyclictest6415-21/usr/sbin/munin12:15:300
24308996028,18cyclictest24413-21ntp_states11:20:210
24308996010,19cyclictest12942-21ntp_states08:30:210
2430899597,17cyclictest25600-21/usr/sbin/munin09:20:180
2430899597,15cyclictest10928-21latency_hist12:35:010
24308995934,17cyclictest24866-21/usr/sbin/munin09:15:280
24308995934,14cyclictest7798-21wc10:15:260
24308995934,14cyclictest11709-21/usr/sbin/munin10:30:270
24308995933,16cyclictest14191-21/usr/sbin/munin08:35:220
24308995932,16cyclictest1189-21/usr/sbin/munin09:50:240
24308995931,16cyclictest26881-21/usr/sbin/munin09:25:300
24308995927,24cyclictest6253-21runrttasks08:05:110
24308995910,19cyclictest28458-21ntp_states09:30:230
24308995910,16cyclictest20593-21memory09:00:160
24308995833,15cyclictest10145-21/usr/sbin/munin08:20:120
24308995826,21cyclictest20431-21/usr/sbin/munin11:05:180
24308995823,22cyclictest18096-21ntp_states08:50:210
3422573,6sleep00-21swapper09:46:500
2430899578,37cyclictest288-21snmpd12:08:340
2430899577,15cyclictest21787-21ntpq11:10:200
24308995734,13cyclictest3343-21chrt07:53:580
24308995733,13cyclictest24655-21seq07:10:180
24308995733,13cyclictest1736-21chrt07:46:140
24308995718,13cyclictest11083-21runrttasks10:30:000
24308995633,15cyclictest2865-21runrttasks12:02:400
24308995631,16cyclictest13731-21latency_hist10:40:020
24308995630,16cyclictest25698-21ntp_states11:25:220
2430899557,24cyclictest288-21snmpd08:02:470
24308995531,14cyclictest17007-21awk08:45:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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