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2026-08-01 - 05:12

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 highest latencies:
System rack4slot6s.osadl.org (updated Sat Aug 01, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
65622480,3sleep0660-21entropy21:20:140
1003921370,2sleep010038-21ntp_states19:50:280
3066621340,3chrt30260-21/usr/sbin/munin23:15:310
2936821340,2sleep029369-21ntpq21:05:220
2252621300,3chrt22523-21systemctl20:40:010
1464021270,3chrt14638-21users00:20:330
753321220,5chrt7534-21switchtime21:45:270
2403021160,3chrt24032-21sort20:45:160
353521070,3sleep03561-21/usr/sbin/munin23:35:290
31768999568,18cyclictest27776-21/usr/sbin/munin23:05:140
31768999466,17cyclictest30462-21df_inode21:10:140
31768999365,17cyclictest13672-21df20:05:130
31768999365,14cyclictest4743-21grep23:40:250
31768999364,16cyclictest28739-21chrt21:03:020
31768999364,16cyclictest26797-21ps23:00:260
31768999263,18cyclictest8274-21/usr/sbin/munin23:55:180
99132910,4sleep09967-21timerandwakeup00:00:280
31768999064,16cyclictest8905-21uptime21:50:300
31768998966,15cyclictest19131-21sort00:40:020
31768998963,15cyclictest20254-21memory20:30:170
31768998962,16cyclictest4543-21ls19:30:020
31768998958,20cyclictest15409-21/usr/sbin/munin20:10:340
31768998954,21cyclictest12198-21/usr/sbin/munin22:05:280
31768998950,22cyclictest15057-21ntpq22:15:230
31768998946,16cyclictest21511-21tr22:40:190
318822880,4sleep031888-21missed_timers21:15:190
31768998865,13cyclictest9886-21runrttasks21:55:220
31768998862,15cyclictest12686-21cut20:00:260
31768998862,14cyclictest5848-21ntp_states23:45:220
31768998861,16cyclictest17091-21chrt22:23:490
31768998859,17cyclictest4262-21runrttasks21:34:380
31768998856,19cyclictest288-21snmpd00:05:490
31768998763,15cyclictest18930-21irqstats20:25:180
31768998763,14cyclictest18220-21chrt20:21:260
31768998762,14cyclictest32684-21seq23:24:380
31768998761,16cyclictest25523-21ntp_states20:50:230
31768998761,14cyclictest6469-21runrttasks21:41:260
31768998760,15cyclictest2603-21users19:20:290
31768998759,17cyclictest14392-21seq22:13:010
31768998758,17cyclictest4441-21/usr/sbin/munin21:35:250
31768998664,13cyclictest11635-21runrttasks19:55:350
31768998659,15cyclictest23260-21seq22:46:330
31768998658,16cyclictest24471-21seq22:50:580
31768998656,18cyclictest7132-21seq23:50:220
31768998562,12cyclictest17453-21latency_hist20:20:020
31768998562,12cyclictest1619-21ls23:30:020
31768998561,14cyclictest1942-21latency_hist19:20:020
31768998560,14cyclictest22945-21ntp_states20:40:210
31768998560,13cyclictest20022-21ls22:35:140
31768998559,15cyclictest13351-21chrt00:15:410
31768998559,14cyclictest32653-21chrt19:11:570
31768998558,15cyclictest26263-21munin-run23:00:000
31768998557,15cyclictest16699-21sort00:30:150
31768998461,15cyclictest27789-21latency_hist21:00:030
31768998461,14cyclictest5471-21runrttasks19:32:540
31768998459,15cyclictest11617-21memory00:10:140
31768998459,14cyclictest2717-21runrttasks23:34:010
31768998459,14cyclictest15384-21df_inode00:25:140
31768998458,15cyclictest11978-21seq22:04:170
31768998456,17cyclictest946-21ntpd22:25:200
31768998361,14cyclictest29260-21runrttasks23:10:210
31768998351,20cyclictest7357-21/usr/sbin/munin19:40:180
31768998350,22cyclictest1874-21/usr/sbin/munin21:25:160
31768998260,13cyclictest6962-21runrttasks19:39:370
31768998259,13cyclictest19862-21latency_hist22:35:020
31768998158,14cyclictest8739-21ntp_states19:45:210
3112427420,31sleep031160-21users19:05:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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