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2026-08-05 - 15:57

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 Wed Aug 05, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1095322400,3sleep010954-21timerwakeupswit10:50:290
2323321400,2sleep023234-21latency_hist11:40:020
120521230,3chrt1202-21awk10:14:590
2342521120,3chrt23423-21if_eth011:40:150
1195321070,4sleep011657-21/usr/sbin/munin10:55:230
300012987,15sleep030044-21cat12:05:160
41052970,2sleep04106-21/usr/sbin/munin12:30:170
277772976,13sleep027849-21users11:55:270
52162927,12sleep05266-21df10:30:130
198702850,2sleep019869-21mailstats11:25:280
135532816,61sleep013557-21users11:00:290
57692796,59sleep05840-21users12:35:300
317112784,60sleep031769-21/usr/sbin/munin12:10:270
438627619,30sleep04411-21munin-run07:10:010
102372756,58sleep010253-21munin-run10:49:590
81032746,58sleep08101-21ntp_states10:40:240
276222736,55sleep027623-21ntp_states09:50:190
160582710,3sleep016060-21timerandwakeup11:10:270
66922703,5sleep00-21swapper10:35:210
4433996725,15cyclictest27315-21latency_hist09:50:020
4433996233,18cyclictest0-21swapper11:50:100
4433996034,16cyclictest3066-21/usr/sbin/munin12:25:240
4433996015,18cyclictest17997-21cat11:20:000
4433996012,17cyclictest11558-21munin-run08:00:000
4433996011,18cyclictest25173-21users11:45:300
443399579,16cyclictest7182-21seq07:29:270
443399579,16cyclictest25075-21munin-run09:35:000
443399577,18cyclictest3927-21/usr/sbin/munin10:25:110
443399577,17cyclictest18435-21ntp_states11:20:230
4433995739,12cyclictest15860-21latency_hist08:30:010
4433995734,14cyclictest24091-21runrttasks09:27:430
4433995733,16cyclictest14037-21runrttasks08:17:010
4433995731,16cyclictest29985-21/usr/sbin/munin10:00:130
4433995730,17cyclictest32618-21/usr/sbin/munin12:15:140
443399569,15cyclictest1444-21df12:20:110
443399569,14cyclictest17249-21munin-run08:40:010
443399568,18cyclictest2643-21/usr/sbin/munin10:20:230
443399568,17cyclictest18674-21basename08:50:000
443399568,15cyclictest20894-21latency_hist09:05:020
443399567,17cyclictest31222-21/usr/sbin/munin10:05:290
4433995633,14cyclictest1452-21/usr/sbin/munin10:15:160
4433995631,15cyclictest28638-21/usr/sbin/munin12:00:150
4433995610,16cyclictest16538-21munin-run08:35:000
443399558,15cyclictest25799-21tr09:39:590
443399558,15cyclictest14258-21/usr/sbin/munin11:05:280
4433995532,15cyclictest14719-21runrttasks08:21:370
4433995530,17cyclictest17795-21runrttasks08:43:370
443399547,20cyclictest276-21runrttasks07:21:220
4433995432,14cyclictest21239-21/usr/sbin/munin11:30:270
4433995430,16cyclictest21982-21runrttasks09:13:010
4433995430,15cyclictest20970-21runrttasks09:05:290
4433995428,17cyclictest4731-21runrttasks07:11:510
4433995428,16cyclictest19756-21runrttasks08:57:240
4433995427,17cyclictest11992-21runrttasks08:02:390
4433995410,16cyclictest8436-21apt-get07:38:040
4433995332,13cyclictest12541-21runrttasks08:06:190
4433995331,14cyclictest10527-21runrttasks07:52:250
4433995330,15cyclictest9922-21runrttasks07:48:140
4433995329,15cyclictest26050-21runrttasks09:41:140
4433995327,18cyclictest13395-21runrttasks08:12:370
4433995311,15cyclictest22950-21munin-run09:20:000
443399528,14cyclictest9214-21seq07:43:120
443399528,13cyclictest28623-21/usr/sbin/munin09:55:190
4433995229,14cyclictest23068-21latency_hist09:20:020
4433995228,16cyclictest18973-21runrttasks08:51:430
4433995228,15cyclictest5647-21runrttasks07:18:350
4433995210,15cyclictest276-21runrttasks07:34:350
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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