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2026-01-10 - 02:24

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 Sat Jan 10, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
739522740,3sleep07394-21wc22:55:010
2113922130,2sleep021138-21mailstats19:35:240
173221120,4sleep01785-21users20:25:270
3079721110,4chrt30795-21df_inode00:25:110
1641721100,3chrt16420-21latency_hist23:30:010
1818021040,3chrt18183-21cpu19:25:120
233622990,3sleep023426-21mailstats23:55:240
306062970,3sleep030617-21latency_hist00:25:000
53822930,3sleep05456-21timerwakeupswit22:45:270
298212885,7sleep029824-21df20:10:110
176742820,2sleep017699-21latency_hist23:35:000
181362816,7sleep018171-21/usr/sbin/munin21:30:170
1323027319,32sleep013255-21ntp_states19:05:170
115862724,58sleep011615-21basename21:05:130
207102695,54sleep020726-21irqstats21:40:150
152232693,5sleep00-21swapper21:19:420
14177996723,13cyclictest28401-21/usr/sbin/munin00:15:190
1417799629,14cyclictest27993-21sshd00:14:560
14177996221,15cyclictest23002-21runrttasks19:43:270
1417799619,16cyclictest22274-21users23:50:280
14177996111,16cyclictest19480-21/usr/sbin/munin21:35:190
216372600,2sleep021638-21cat23:50:010
1417799609,17cyclictest23320-21/usr/sbin/munin19:45:140
1417799608,20cyclictest28488-21/usr/sbin/munin20:05:270
1417799608,16cyclictest30978-21df_inode22:20:130
1417799608,16cyclictest10068-21/usr/sbin/munin23:05:180
1417799608,15cyclictest2767-21ntp_states20:30:230
14177996032,17cyclictest6521-21/usr/sbin/munin20:45:170
14177996032,17cyclictest14134-21/usr/sbin/munin23:20:160
14177996025,13cyclictest276-21runrttasks22:25:130
1417799599,17cyclictest11680-21proc_pri23:10:230
14177995934,17cyclictest23854-21runrttasks21:51:170
14177995934,16cyclictest8063-21/usr/sbin/munin22:55:300
14177995934,16cyclictest1213-21/usr/sbin/munin22:30:180
14177995924,14cyclictest20227-21sshd19:31:560
14177995910,17cyclictest5658-21/usr/sbin/munin20:40:260
14177995910,17cyclictest24433-21/usr/sbin/munin21:55:240
14177995835,16cyclictest31240-21/usr/sbin/munin20:15:160
14177995835,14cyclictest10827-21/usr/sbin/munin21:00:300
14177995834,15cyclictest30181-21/usr/sbin/munin22:15:260
14177995834,15cyclictest26234-21/usr/sbin/munin19:55:250
14177995810,17cyclictest13816-21munin-run23:20:010
14177995810,16cyclictest900-21df_inode00:35:120
1417799578,16cyclictest8973-21df20:55:100
1417799578,13cyclictest171322sleep019:20:170
1417799577,17cyclictest15555-21/usr/sbin/munin19:15:220
14177995732,15cyclictest8868-21/usr/sbin/munin23:00:150
14177995732,15cyclictest3822-21df_inode20:35:120
14177995710,14cyclictest26063-21/usr/sbin/munin00:05:260
1417799569,15cyclictest723-21sh00:35:000
1417799568,17cyclictest24605-21/usr/sbin/munin19:50:270
1417799568,17cyclictest15422-21/usr/sbin/munin21:20:140
1417799567,18cyclictest18080-21awk23:35:180
14177995632,14cyclictest24362-21/usr/sbin/munin00:00:150
14177995631,16cyclictest27424-21/usr/sbin/munin22:05:230
14177995614,14cyclictest23939-1kworker/0:2H22:45:010
1417799559,17cyclictest13068-21grep21:10:180
1417799559,14cyclictest27200-21/usr/sbin/munin20:00:150
1417799558,16cyclictest14279-21grep19:10:110
1417799557,13cyclictest16997-21ntp_states21:25:230
14177995532,14cyclictest32516-21/usr/sbin/munin20:20:140
14177995531,16cyclictest2927-21runrttasks22:35:340
14177995531,15cyclictest8034-21/usr/sbin/munin20:50:250
14177995530,16cyclictest26452-21runrttasks22:01:150
14177995529,16cyclictest19172-21/usr/sbin/munin23:40:120
1417799548,13cyclictest292512chrt22:13:120
14177995431,14cyclictest22259-21/usr/sbin/munin21:45:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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