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2026-08-21 - 06:06

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 Aug 21, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2874722190,2sleep028749-21idleruntime-cro00:35:000
2293721460,2sleep022940-21wc00:10:270
1950621320,4chrt19503-21users19:45:290
2557721250,2sleep025578-21find22:15:250
375021240,3chrt3751-21sort20:50:260
2162421230,3chrt21622-21switchtime00:05:290
962821220,2sleep09625-21cat21:15:000
1357721190,3chrt13575-21memory23:35:210
2918221160,2sleep029183-21cut20:25:020
2681121080,2sleep026812-21ls20:15:150
293122950,4sleep029344-21grep22:30:200
242362930,3sleep024234-21grep20:05:170
319392928,13sleep031941-21ntp_states22:40:220
215432925,13sleep021565-21sort19:55:150
89172910,4sleep09001-21mailstats19:05:240
265082885,10sleep026524-21munin-run20:15:010
265632870,4sleep026590-21/usr/sbin/munin00:25:220
162062850,3sleep016249-21awk23:45:220
219932810,2sleep021994-21modprobe22:01:000
99102800,3sleep09956-21tr21:15:210
115632790,3sleep011560-21find19:15:270
309332740,2sleep030934-21/usr/sbin/munin22:35:280
977199639,17cyclictest11003-21/usr/sbin/munin21:20:310
9771996222,12cyclictest276-21runrttasks22:59:340
9771996211,18cyclictest5960-21irqstats21:00:160
9771996211,18cyclictest12098-21/usr/sbin/munin23:30:310
9771996139,12cyclictest19971-21latency_hist21:55:020
9771996120,28cyclictest14031-21/usr/sbin/munin19:25:210
977199609,18cyclictest28930-21/usr/sbin/munin00:35:130
977199609,17cyclictest6924-21/usr/sbin/munin23:10:260
977199609,16cyclictest2388-21sshd22:50:390
977199608,14cyclictest23999-21ntp_states00:15:260
9771995935,15cyclictest25096-21/usr/sbin/munin00:20:150
9771995933,15cyclictest23393-21/usr/sbin/munin20:00:300
9771995919,17cyclictest326972chrt20:37:500
9771995910,16cyclictest12479-21chrt21:25:200
977199587,17cyclictest8210-21/usr/sbin/munin23:15:270
9771995832,15cyclictest18096-21/usr/sbin/munin19:40:240
9771995820,12cyclictest18539-21/usr/sbin/munin23:55:290
977199579,17cyclictest30527-21/usr/sbin/munin20:30:280
977199579,16cyclictest16214-21df21:40:120
977199579,16cyclictest15036-21/usr/sbin/munin19:30:220
977199579,15cyclictest4505-21/usr/sbin/munin20:55:240
977199579,15cyclictest10815-21grep23:25:100
977199578,16cyclictest20244-21/usr/sbin/munin00:00:240
977199578,16cyclictest1805-21cron20:45:000
977199577,20cyclictest13848-21awk21:30:210
977199577,16cyclictest20196-21/usr/sbin/munin19:50:240
977199576,19cyclictest14857-21/usr/sbin/munin21:35:140
9771995733,15cyclictest24214-21/usr/sbin/munin22:10:250
9771995732,15cyclictest5688-21/usr/sbin/munin23:05:100
9771995731,17cyclictest15255-21/usr/sbin/munin23:40:280
9771995711,14cyclictest17446-21/usr/sbin/munin21:45:170
977199569,17cyclictest20009-21/usr/sbin/munin21:55:100
977199568,16cyclictest17835-21ls23:50:300
977199568,15cyclictest7504-21/usr/sbin/munin21:05:260
977199568,15cyclictest27781-21/usr/sbin/munin22:25:160
977199568,14cyclictest13670-21sort19:25:000
977199567,16cyclictest16314-21/usr/sbin/munin19:35:120
977199567,15cyclictest4405-21df23:00:120
9771995632,16cyclictest2121-21/usr/sbin/munin20:45:180
9771995632,16cyclictest10265-21/usr/sbin/munin19:10:250
9771995610,18cyclictest1641-21munin-run22:50:000
977199559,14cyclictest9526-21/usr/sbin/munin23:20:130
9771995514,13cyclictest22766-21latency22:05:190
977199547,16cyclictest26750-21chrt22:20:200
977199539,15cyclictest29244-21egrep20:25:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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