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2026-06-30 - 07:23

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 Tue Jun 30, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2632921660,2sleep026331-21latency_hist21:25:020
108321580,2sleep01080-21cat19:45:270
1994621370,3sleep019948-21ls23:05:190
162221310,4chrt1623-21/usr/sbin/munin00:00:150
1853221260,3chrt18533-21latency_hist20:55:010
428221210,3chrt4281-21/usr/sbin/munin00:10:220
2950621200,3chrt29508-21awk19:30:250
1100621200,5chrt11005-21awk20:25:170
597921160,4chrt5981-21grep22:10:270
45221150,3chrt450-21wc19:45:010
2278521070,4sleep022827-21/usr/sbin/munin19:05:160
2453821030,3sleep024541-21vmstat19:10:300
76492980,5sleep07650-21sshd22:17:280
264792980,3sleep026496-21/usr/sbin/munin23:30:220
316482940,4sleep031697-21/usr/sbin/munin23:50:240
4862930,4sleep0554-21/usr/sbin/munin23:55:230
290202890,4sleep029074-21/usr/sbin/munin21:35:150
85432885,9sleep08547-21ntp_states20:15:200
43012870,4sleep04320-21/usr/sbin/munin22:05:150
299472876,66sleep029991-21cat23:45:020
105742870,3sleep010563-21latency_hist22:30:020
163162860,3sleep016373-21cat22:50:300
266932810,3sleep026731-21load19:20:170
71232795,61sleep07163-21memory20:10:170
145602755,56sleep014610-21df22:45:100
2384699628,13cyclictest9584-21/usr/sbin/munin20:20:330
2384699618,19cyclictest31529-21/usr/sbin/munin21:45:240
23846996127,22cyclictest11391-21runrttasks22:31:180
2384699608,18cyclictest1809-21/usr/sbin/munin19:50:280
23846996011,17cyclictest18904-21/usr/sbin/munin20:55:250
2384699599,21cyclictest8394-21ntpq22:20:190
2384699598,16cyclictest21013-21/usr/sbin/munin23:10:200
23846995935,15cyclictest5413-21/usr/sbin/munin00:15:120
23846995910,16cyclictest31565-21munin-run19:40:000
2384699589,15cyclictest6184-21sshd20:05:260
23846995833,16cyclictest14822-21/usr/sbin/munin20:40:140
23846995812,16cyclictest17195-21/usr/sbin/munin22:55:130
23846995811,18cyclictest19960-21df_inode21:00:140
23846995811,15cyclictest14603-21munin-run20:40:010
23846995810,16cyclictest30068-21egrep23:45:110
2384699579,17cyclictest2780-21/usr/sbin/munin00:05:340
2384699579,16cyclictest27978-21latency19:25:180
2384699577,15cyclictest31450-21date21:45:010
2384699576,13cyclictest18440-21cpu23:00:100
23846995731,16cyclictest28044-21/usr/sbin/munin21:30:250
23846995727,21cyclictest11018-21runrttasks00:35:280
23846995711,20cyclictest639-21ntp_states21:50:240
2384699569,18cyclictest22298-21/usr/sbin/munin23:15:180
2384699568,16cyclictest23619-21grep23:20:110
2384699568,16cyclictest1777-21/usr/sbin/munin21:55:170
2384699568,15cyclictest11970-21/usr/sbin/munin22:35:190
2384699567,17cyclictest26784-21/usr/sbin/munin21:25:270
23846995632,15cyclictest12233-21/usr/sbin/munin20:30:140
23846995631,16cyclictest4678-21/usr/sbin/munin20:00:220
23846995631,16cyclictest25221-21/usr/sbin/munin23:25:240
23846995630,16cyclictest23468-21runrttasks21:13:390
23846995611,17cyclictest21457-21ntpq21:05:200
2384699559,16cyclictest16019-21/usr/sbin/munin20:45:190
2384699558,16cyclictest3091-21/usr/sbin/munin19:55:110
2384699558,15cyclictest23767-21/usr/sbin/munin21:15:170
23846995531,15cyclictest3133-21/usr/sbin/munin22:00:180
23846995530,15cyclictest9810-21/usr/sbin/munin00:30:290
2384699549,15cyclictest25278-21df19:15:130
2384699547,16cyclictest8228-21ntp_states00:25:230
23846995431,16cyclictest13925-21runrttasks22:40:470
23846995410,18cyclictest28384-21seq23:38:040
2384699538,17cyclictest6635-21modprobe00:20:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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