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2026-06-11 - 12:43

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Thu Jun 11, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1094521230,4chrt10946-21/usr/sbin/munin22:50:270
1841621210,3chrt18417-21/usr/sbin/munin23:20:140
70121140,4chrt698-21ls22:10:270
3154321100,3sleep031544-21memory22:05:170
2037021000,4sleep020439-21/usr/sbin/munin19:15:270
263352990,4sleep026376-21/usr/sbin/munin21:45:180
109772980,3sleep010981-21ntpq20:45:240
96582970,4sleep09720-21grep22:45:250
275162930,3sleep027526-21cron19:45:000
29702910,4sleep03002-21netstat22:20:170
300732850,3sleep030075-21missed_timers00:05:180
284312837,63sleep028457-21munin-run00:00:000
137472790,3sleep013749-21switchtime20:55:270
249102770,3sleep024916-21missed_timers23:45:180
291802755,61sleep029209-21ntp_offset19:50:200
124322750,2chrt12434-21swap20:50:260
1736327420,31sleep017369-21df_inode19:05:120
188622710,2sleep018865-21mailstats21:15:250
171182700,2sleep017117-21latency23:15:150
18511996629,27cyclictest3314-21/usr/sbin/munin20:15:250
311332615,43sleep0288-21snmpd19:58:040
18511996135,16cyclictest8162-21/usr/sbin/munin20:35:130
18511996135,16cyclictest2856-21/usr/sbin/munin00:25:180
18511996122,12cyclictest14658-21awk23:05:180
18511996118,16cyclictest14615-21df_inode21:00:130
1851199609,18cyclictest17141-21/usr/sbin/munin21:10:240
1851199608,17cyclictest25201-21irqstats19:35:160
18511996035,16cyclictest5604-21/usr/sbin/munin20:25:130
18511996033,17cyclictest4508-21/usr/sbin/munin22:25:270
18511996010,16cyclictest28754-21/usr/sbin/munin21:55:180
1851199598,19cyclictest31167-21/usr/sbin/munin00:10:110
1851199597,17cyclictest1462-21/usr/sbin/munin22:15:280
18511995935,16cyclictest23628-21runrttasks23:40:170
18511995935,16cyclictest13357-21/usr/sbin/munin23:00:190
18511995933,17cyclictest19197-21/usr/sbin/munin19:10:270
18511995911,15cyclictest1787-21irqstats20:10:170
18511995910,16cyclictest27471-21/usr/sbin/munin21:50:280
18511995835,14cyclictest32126-21/usr/sbin/munin20:00:300
18511995834,15cyclictest31174-21runrttasks22:04:360
18511995833,16cyclictest6710-21/usr/sbin/munin22:35:130
18511995833,16cyclictest4789-21/usr/sbin/munin20:20:260
18511995833,16cyclictest23299-21latency_hist23:40:010
18511995833,16cyclictest1376-21/usr/sbin/munin00:20:130
18511995832,15cyclictest9031-21runrttasks22:44:330
18511995831,17cyclictest9679-21/usr/sbin/munin20:40:200
18511995831,16cyclictest26356-21/usr/sbin/munin23:50:240
1851199579,15cyclictest3872-21/usr/sbin/munin00:30:180
1851199578,17cyclictest20844-21/usr/sbin/munin23:30:250
1851199578,16cyclictest23593-21/usr/sbin/munin21:35:100
1851199577,19cyclictest15755-21/usr/sbin/munin23:10:120
18511995733,15cyclictest12116-21/usr/sbin/munin22:55:240
18511995732,16cyclictest25234-21/usr/sbin/munin21:40:240
18511995731,17cyclictest21286-21/usr/sbin/munin19:20:120
18511995731,16cyclictest32577-21/usr/sbin/munin00:15:150
18511995730,15cyclictest24453-21runrttasks19:31:040
18511995710,14cyclictest20732-21modprobe23:30:010
1851199569,16cyclictest351-21/usr/sbin/munin20:05:190
1851199569,16cyclictest20076-21/usr/sbin/munin21:20:230
1851199569,15cyclictest23640-21cron19:30:000
1851199569,15cyclictest21078-21df21:25:100
1851199567,18cyclictest15850-21/usr/sbin/munin21:05:270
18511995632,14cyclictest5969-21runrttasks00:37:120
18511995616,16cyclictest22511-21missed_timers21:30:180
1851199558,13cyclictest5489-21seq22:30:160
18511995530,15cyclictest28433-21runrttasks19:46:550
18511995510,17cyclictest28643-21df00:00:110
18511995431,14cyclictest7132-21/usr/sbin/munin20:30:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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