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2025-11-20 - 20:15

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 Thu Nov 20, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2773822930,3sleep027740-21missed_timers07:10:190
2925121330,2sleep029254-21sort09:20:270
152321300,3chrt1524-21ntpq11:45:230
2136721270,3chrt21366-21cat08:50:270
3107921240,2sleep031080-21ls11:35:010
1963621120,4sleep019633-21/usr/sbin/munin08:45:110
2856621040,4sleep028567-21munin-node11:25:140
1580421030,4sleep015810-21missed_timers10:35:200
181372990,3sleep018136-21date10:45:020
26772947,13sleep02726-21modprobe07:40:010
105112915,11sleep010523-21dpkg12:20:180
5442880,3sleep0561-21/usr/sbin/munin07:30:240
137482886,12sleep013780-21users08:20:310
65112870,2sleep06514-21latency_hist10:00:020
145132856,10sleep014516-21df08:25:100
315122845,9sleep031563-21irqstats07:25:150
66452750,3sleep06684-21cat10:00:150
2623427517,31sleep026284-21df07:05:110
234482743,5sleep00-21swapper11:05:130
2743899629,20cyclictest1419-21/usr/sbin/munin09:40:170
27438996212,18cyclictest5144-21/usr/sbin/munin12:00:190
27438996120,13cyclictest5738-21pluginstate07:50:240
2743899609,17cyclictest32555-21/usr/sbin/munin09:35:120
2743899609,15cyclictest18212-21/usr/sbin/munin10:45:120
2743899607,20cyclictest9296-21/usr/sbin/munin08:05:140
25502603,46sleep00-21swapper11:50:130
227692600,2sleep022768-21timerandwakeup08:55:410
2743899599,17cyclictest28824-21/usr/sbin/munin07:15:280
2743899599,16cyclictest631-21seq11:40:500
27438995936,15cyclictest16068-21/usr/sbin/munin08:30:230
27438995917,12cyclictest17382-21proc_pri08:35:280
2743899589,18cyclictest8009-21ntpq12:10:230
2743899589,17cyclictest9344-21/usr/sbin/munin10:10:200
2743899589,17cyclictest22094-21/usr/sbin/munin11:00:320
2743899589,14cyclictest12999-21df_inode12:30:140
2743899589,14cyclictest11796-21/usr/sbin/munin12:25:140
2743899588,20cyclictest27531-21ntp_kernel_err11:20:210
2743899588,18cyclictest24666-21/usr/sbin/munin11:10:140
2743899588,17cyclictest23517-21/usr/sbin/munin09:00:200
2743899588,15cyclictest2844-21/usr/sbin/munin07:40:250
2743899587,19cyclictest14223-21/usr/sbin/munin12:35:200
2743899587,17cyclictest6688-21/usr/sbin/munin07:55:230
27438995835,13cyclictest19562-21/usr/sbin/munin10:50:140
27438995834,15cyclictest24948-21/usr/sbin/munin09:05:140
27438995833,16cyclictest4022-21/usr/sbin/munin11:55:170
27438995832,15cyclictest12079-21/usr/sbin/munin08:15:220
2743899579,18cyclictest3982-21/usr/sbin/munin09:50:200
2743899579,18cyclictest10186-21systemctl12:20:000
2743899579,15cyclictest13043-21/usr/sbin/munin10:25:280
2743899578,17cyclictest14731-21grep10:30:260
27438995731,17cyclictest31386-21latency_hist07:25:020
2743899569,17cyclictest22189-21snmpd07:47:420
2743899569,15cyclictest3220-21awk09:45:310
2743899569,15cyclictest25952-21/usr/sbin/munin11:15:200
2743899569,14cyclictest18347-21/usr/sbin/munin08:40:130
2743899568,15cyclictest11759-21/usr/sbin/munin10:20:270
2743899568,15cyclictest10580-21/usr/sbin/munin08:10:270
2743899567,17cyclictest8887-21chrt08:02:410
2743899567,16cyclictest6578-21irqstats12:05:160
2743899567,15cyclictest21198-21systemctl10:55:260
2743899566,16cyclictest30059-21chrt09:25:130
27438995610,16cyclictest31345-21ls11:35:190
2743899558,15cyclictest26102-21/usr/sbin/munin09:10:150
2743899557,16cyclictest10438-21/usr/sbin/munin10:15:150
27438995510,14cyclictest31420-21irqstats09:30:160
27438995411,13cyclictest27515-21/usr/sbin/munin09:15:150
27438995410,15cyclictest7927-21df_inode10:05:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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