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2026-01-09 - 07:10

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 Fri Jan 09, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
777422600,2sleep07775-21modprobe21:55:000
2347121590,3sleep023469-21ls20:50:000
1236121220,3chrt12359-21users22:10:280
1089521200,4chrt10890-21ntp_states20:00:190
1707221130,4chrt17071-21/usr/sbin/munin00:35:230
172921070,4chrt1730-21mailstats23:35:270
1745121060,5sleep017520-21/usr/sbin/munin22:30:280
325022980,4sleep032521-21idleruntime23:30:130
263822970,4sleep026427-21/usr/sbin/munin23:05:280
315752860,2sleep031578-21tr23:25:260
208212840,3sleep020822-21egrep22:45:110
2963927718,16sleep00-21swapper19:06:590
30053997445,18cyclictest5490-21/usr/sbin/munin23:50:240
30053997344,16cyclictest24984-21ntp_states23:00:210
184972720,3sleep018526-21sort20:30:180
30053997143,20cyclictest24146-21/usr/sbin/munin20:50:290
273982710,2sleep027394-21latency_hist21:05:020
30053997043,14cyclictest11901-21/usr/sbin/munin20:05:300
30053997037,19cyclictest15737-21ls20:20:020
30053996941,15cyclictest2077-21seq21:30:410
30053996844,14cyclictest30767-21chrt19:10:340
30053996836,21cyclictest23625-21/usr/sbin/munin22:55:180
30053996741,14cyclictest9211-21memory00:05:170
30053996741,14cyclictest30134-21/usr/sbin/munin23:20:170
30053996640,14cyclictest17039-21sort20:25:010
30053996543,13cyclictest3577-21runrttasks23:43:490
30053996540,14cyclictest20853-21munin-run20:40:010
30053996530,23cyclictest9766-21/usr/sbin/munin19:55:260
30053996525,16cyclictest28379-21runrttasks21:08:150
30053996521,18cyclictest21130-21irqstats20:40:160
30053996440,14cyclictest3114-21ntp_kernel_pll_19:30:180
30053996438,15cyclictest10083-21seq22:02:450
30053996435,18cyclictest31404-21df_inode21:20:130
30053996433,20cyclictest1867-21ntp_states19:25:210
30053996339,14cyclictest22387-21ntpq22:50:220
30053996339,14cyclictest13243-21/usr/sbin/munin22:15:170
30053996338,15cyclictest8612-21/usr/sbin/munin19:50:290
30053996338,15cyclictest16264-21runrttasks00:32:020
30053996336,17cyclictest7008-21chrt19:45:200
30053996336,17cyclictest4317-21mailstats23:45:250
30053996336,17cyclictest15026-21sshd22:20:520
30053996336,16cyclictest29628-21runrttasks21:12:540
30053996334,20cyclictest614-21/usr/sbin/munin19:20:230
30053996332,22cyclictest17207-21/usr/sbin/munin20:25:140
30053996238,15cyclictest3695-21seq21:38:300
30053996237,15cyclictest28609-21df_inode23:15:140
30053996235,17cyclictest14379-21memory00:25:180
30053996234,18cyclictest9123-21date22:00:020
30053996234,18cyclictest10703-21/usr/sbin/munin00:10:260
30053996137,14cyclictest587-21grep21:25:260
30053996133,15cyclictest27557-21ntp_states23:10:220
30053996122,25cyclictest4225-21memory21:40:160
30053996121,15cyclictest13474-21runrttasks20:10:200
30053996039,13cyclictest5315-21idleruntime-cro19:40:000
30053996035,15cyclictest5608-21ntp_states21:45:220
30053996034,15cyclictest5450-21chrt19:40:090
30053996034,15cyclictest15836-21/usr/sbin/munin22:25:160
30053996033,18cyclictest19823-21ntp_states22:40:220
30053996027,20cyclictest6420-21/usr/sbin/munin23:55:170
30053995910,18cyclictest30015-21/usr/sbin/munin21:15:310
30053995834,14cyclictest276-21runrttasks00:20:220
30053995834,14cyclictest11648-21latency_hist22:10:020
30053995833,13cyclictest25296-21tr20:55:250
30053995828,18cyclictest11643-21df00:15:130
30053995734,14cyclictest7920-21memory00:00:180
30053995733,16cyclictest18789-21/usr/sbin/munin22:35:270
30053995731,15cyclictest32660-21date19:20:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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