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2026-09-20 - 13:41

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 Sun Sep 20, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
529922580,3sleep05300-21latency_hist00:15:010
452221380,4chrt4395-21/usr/sbin/munin20:00:160
952621350,3sleep09527-21latency_hist20:20:020
2627721280,4chrt26275-21df_inode23:30:140
666021260,2sleep06661-21modprobe22:15:000
1995321230,3chrt19951-21memory23:05:190
1970321220,3chrt19705-21latency_hist23:05:020
2835921200,3chrt28356-21sshd21:31:250
1174221190,3chrt11744-21latency_hist00:40:010
2539121170,4chrt25392-21basename23:25:260
698421130,3sleep06987-21missed_timers22:15:200
3174921080,3sleep031752-21df19:40:140
1448121080,4sleep014557-21latency_hist22:45:020
396321060,2sleep03960-21awk00:10:000
971021050,2sleep09713-21interrupts20:20:190
26592970,3sleep02671-21latency_hist00:05:000
5092946,13sleep0524-21memory21:50:190
30732930,3sleep03104-21latency22:00:150
225352926,11sleep022553-21/usr/sbin/munin21:10:150
315632910,4sleep031621-21ntp_kernel_err23:50:190
301552860,4sleep030173-21/usr/sbin/munin23:45:170
175912860,3sleep017642-21wc20:50:230
30862835,66sleep03136-21df19:55:140
2324227622,31sleep022638-21/usr/sbin/munin19:05:290
291332734,56sleep029188-21ntpq21:35:210
2384099628,18cyclictest8405-21sshd22:20:230
23840996124,15cyclictest1482-21latency_hist00:00:020
23840996111,17cyclictest28665-21ls23:40:010
23840996010,16cyclictest2092-21ntp_states19:50:240
2384099599,16cyclictest28105-21ntpq19:25:220
2384099598,17cyclictest14595-21/usr/sbin/munin22:45:180
23840995936,15cyclictest5552-21/usr/sbin/munin00:15:190
23840995935,15cyclictest21210-21/usr/sbin/munin23:10:180
23840995933,16cyclictest31996-21/usr/sbin/munin21:45:260
23840995917,15cyclictest18864-21ntp_states20:55:220
23840995910,17cyclictest26401-21munin-run19:20:010
2384099589,15cyclictest24033-21/usr/sbin/munin21:15:220
2384099588,18cyclictest5716-21chrt20:05:140
2384099587,17cyclictest12137-21/usr/sbin/munin20:30:290
2384099587,16cyclictest17160-21/usr/sbin/munin22:55:150
45222570,5sleep04520-21sshd22:05:250
2384099579,18cyclictest31069-21sshd21:42:240
2384099579,18cyclictest26360-21/usr/sbin/munin21:25:210
2384099579,15cyclictest25081-21/usr/sbin/munin21:20:290
2384099579,14cyclictest6682-21/usr/sbin/munin00:20:290
2384099578,16cyclictest9436-21memory00:30:200
23840995734,16cyclictest2020-21/usr/sbin/munin21:55:260
23840995733,16cyclictest30450-21/usr/sbin/munin19:35:140
23840995733,15cyclictest24250-21/usr/sbin/munin23:20:310
23840995720,13cyclictest16028-21cpu20:45:120
2384099569,15cyclictest29293-21memory19:30:180
2384099569,14cyclictest9440-21df22:25:110
2384099568,15cyclictest14598-21sendmail20:40:010
2384099567,15cyclictest15880-21/usr/sbin/munin22:50:180
23840995635,13cyclictest24146-21/usr/sbin/munin19:10:190
23840995633,14cyclictest21319-21irqstats21:05:160
23840995632,16cyclictest20780-21runrttasks21:02:480
23840995632,16cyclictest12222-21/usr/sbin/munin22:35:200
23840995632,16cyclictest11084-21/usr/sbin/munin22:30:250
23840995632,15cyclictest9165-21sed00:30:010
23840995532,15cyclictest27637-21runrttasks19:24:360
23840995514,15cyclictest276-21runrttasks19:46:260
23840995514,12cyclictest22325-21/usr/sbin/munin23:15:250
23840995511,17cyclictest15126-21sendmail_mailqu20:40:250
23840995510,17cyclictest12093-21latency_hist20:30:020
23840995510,16cyclictest28806-21/usr/sbin/munin23:40:300
2384099538,18cyclictest7372-21find20:10:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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