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2026-09-17 - 06:39

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 Sep 17, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
399122360,3sleep03989-21grep19:55:250
212021440,2sleep02119-21wc00:00:170
2062921330,4chrt20628-21/usr/sbin/munin23:05:250
2705421140,4sleep027056-21memory21:25:180
232421140,4chrt2327-21missed_timers21:55:180
1661521000,4sleep016662-21irqstats20:45:170
152362970,4sleep015252-21cpu20:40:100
113832900,3sleep011414-21/usr/sbin/munin20:25:150
179152890,3sleep017916-21ntp_states22:55:240
257452870,3sleep025823-21mailstats23:25:260
130542860,3sleep013066-21vmstat22:35:300
2319727417,31sleep023248-21irqstats19:05:160
24309996819,15cyclictest288-21snmpd23:10:220
24309996212,19cyclictest25876-21ntp_states21:20:230
2430999619,19cyclictest9196-21/usr/sbin/munin22:20:270
24309996110,16cyclictest28216-21ntpq23:35:200
2430999609,16cyclictest4862-21/usr/sbin/munin20:00:120
2430999608,16cyclictest24405-21/usr/sbin/munin19:10:280
24309996019,16cyclictest6466-21open_files20:05:220
24309996017,15cyclictest13990-21df_inode20:35:130
2430999599,16cyclictest1132-21ntp_states21:50:220
24309995936,14cyclictest31661-21runrttasks21:43:050
24309995933,17cyclictest27290-21/usr/sbin/munin19:20:200
24309995931,17cyclictest10367-21/usr/sbin/munin20:20:250
24309995910,17cyclictest19215-21ntp_states23:00:210
24309995910,17cyclictest10993-21/usr/sbin/munin00:35:200
24309995910,14cyclictest7588-21ntp_states22:15:260
2430999589,16cyclictest9896-21/usr/sbin/munin22:25:210
2430999588,16cyclictest311602sleep019:35:240
24309995833,15cyclictest8981-21/usr/sbin/munin20:15:220
24309995812,15cyclictest14054-21ntp_states22:40:200
224282583,5sleep00-21swapper21:06:380
2430999579,18cyclictest285-21sshd22:02:360
2430999579,16cyclictest9714-21/usr/sbin/munin00:30:150
2430999579,16cyclictest32162-21/usr/sbin/munin19:40:120
2430999579,16cyclictest28150-21/usr/sbin/munin21:30:140
2430999579,16cyclictest22788-21/usr/sbin/munin23:15:290
2430999579,16cyclictest18352-21sed20:50:270
2430999578,19cyclictest21011-21sshd21:00:320
2430999578,18cyclictest439-21seq23:54:230
2430999578,17cyclictest16600-21tr22:50:200
2430999578,16cyclictest299732chrt19:30:250
2430999578,15cyclictest26205-21threads19:15:290
24309995735,15cyclictest7501-21runrttasks20:10:140
24309995733,15cyclictest1237-21/usr/sbin/munin23:55:280
24309995732,15cyclictest28343-21/usr/sbin/munin19:25:110
24309995729,17cyclictest8708-21ntp_states00:25:210
24309995710,16cyclictest26998-21/usr/sbin/munin23:30:220
2430999569,16cyclictest29433-21/usr/sbin/munin21:35:170
2430999569,16cyclictest19087-21/usr/sbin/munin20:55:160
2430999569,16cyclictest15055-21/usr/sbin/munin22:45:190
2430999569,15cyclictest6285-21tr22:10:190
2430999569,15cyclictest30550-21/usr/sbin/munin23:45:280
2430999568,16cyclictest29267-21/usr/sbin/munin23:40:230
2430999568,15cyclictest2271-21/usr/sbin/munin19:50:230
24309995632,15cyclictest7860-21runrttasks00:21:260
24309995632,15cyclictest24916-21runrttasks23:22:090
2430999559,15cyclictest4995-21/usr/sbin/munin22:05:200
24309995530,16cyclictest5879-21runrttasks00:15:110
24309995530,15cyclictest23562-21/usr/sbin/munin21:10:290
24309995529,17cyclictest32211-21runrttasks21:45:150
24309995529,17cyclictest12886-21/usr/sbin/munin20:30:190
24309995526,19cyclictest4678-21/usr/sbin/munin00:10:160
24309995432,14cyclictest11976-21runrttasks22:32:040
24309995431,14cyclictest3510-21/usr/sbin/munin00:05:230
24309995429,15cyclictest24532-21/usr/sbin/munin21:15:200
24309995327,15cyclictest1093-21/usr/sbin/munin19:45:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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