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2025-11-29 - 12:00

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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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 Fri Nov 28, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2722321760,3sleep027224-21cat11:00:020
150721390,2sleep01508-21ls07:15:020
313821370,3chrt3139-21cat07:20:210
2855021350,4chrt28552-21sendmail09:00:000
1725321280,3chrt17255-21mailstats12:25:230
693421130,3sleep06710-21/usr/sbin/munin07:35:200
3125421130,4sleep031171-21/usr/sbin/munin11:15:140
551821120,4sleep05326-21/usr/sbin/munin09:35:220
296321090,4sleep03013-21/usr/sbin/munin09:25:200
166932940,3sleep016720-21latency_hist12:25:010
223362930,3sleep022342-21missed_timers10:40:170
205652930,4sleep020574-21munin-run12:40:000
93112910,2sleep09345-21irqstats09:50:170
145392840,3sleep014557-21/usr/sbin/munin08:05:140
172352835,9sleep017261-21ntp_states10:20:190
325662825,63sleep032620-21df09:15:130
3256327922,34sleep032588-21munin-run07:10:010
32615996332,22cyclictest1405-21/usr/sbin/munin11:25:160
3261599618,22cyclictest9235-21seq07:45:020
32615996130,22cyclictest11043-21/usr/sbin/munin09:55:300
3261599608,18cyclictest18122-21/usr/sbin/munin12:30:340
3261599606,24cyclictest15755-21/usr/sbin/munin08:10:100
32615996018,14cyclictest27879-21cat11:00:310
32615996011,16cyclictest32583-21/usr/sbin/munin11:20:150
32615996010,17cyclictest5424-21/usr/sbin/munin07:30:260
32615996010,17cyclictest28605-21/usr/sbin/munin11:05:310
3261599599,16cyclictest18225-21munin-run08:20:010
3261599599,15cyclictest4040-21/usr/sbin/munin09:30:200
3261599597,19cyclictest3890-21/usr/sbin/munin11:35:210
32615995936,15cyclictest9178-21/usr/sbin/munin11:55:150
32615995920,15cyclictest31982-21runrttasks09:11:160
32615995916,14cyclictest18651-21ntpq08:20:210
3261599589,18cyclictest8207-21ntp_states09:45:230
3261599589,17cyclictest23496-21df_inode10:45:160
3261599589,17cyclictest20972-21irqstats10:35:150
3261599589,16cyclictest24694-21munin-run08:45:000
3261599589,16cyclictest2139-21/usr/sbin/munin07:15:290
3261599589,15cyclictest22094-21munin-run08:35:000
3261599588,18cyclictest22189-21snmpd10:15:200
32615995832,16cyclictest24899-21/usr/sbin/munin10:50:180
32615995817,15cyclictest13182-21cpu08:00:120
32615995811,16cyclictest22189-21snmpd08:40:020
3261599579,18cyclictest10654-21df_inode07:50:150
3261599579,15cyclictest28694-21/usr/sbin/munin09:00:270
3261599579,13cyclictest10367-21grep12:00:110
3261599578,16cyclictest4141-21/usr/sbin/munin07:25:270
3261599578,14cyclictest24813-21/usr/sbin/munin08:45:120
3261599576,17cyclictest9305-21/usr/sbin/munin07:45:260
32615995733,15cyclictest13194-21/usr/sbin/munin12:10:180
32615995733,15cyclictest12112-21/usr/sbin/munin07:55:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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