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2026-07-16 - 01:26

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 Jul 15, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3204122530,3sleep032037-21ps11:40:250
2548621300,3chrt25485-21/usr/sbin/munin11:15:200
2426021270,3chrt23932-21/usr/sbin/munin11:10:250
465121260,4chrt4649-21irqstats09:55:160
2938621260,4chrt29387-21latency_hist07:20:030
2829621230,4chrt27816-21/usr/sbin/munin11:25:250
1284721170,3sleep012846-21cat10:25:290
991921130,3chrt9917-21df_inode08:10:130
2984221120,4sleep029431-21/usr/sbin/munin07:20:280
149742940,2sleep015027-21interrupts10:35:170
72692930,2sleep07268-21wc10:05:170
49512910,3sleep04950-21awk07:50:210
322942850,3sleep032312-21awk07:30:240
26732998352,19cyclictest11342-21/usr/sbin/munin10:20:240
12202830,4sleep01281-21grep07:35:270
26732997648,17cyclictest3283-21df09:50:140
26732997547,15cyclictest17878-21/usr/sbin/munin10:45:260
26732997538,14cyclictest29834-21/usr/sbin/munin09:25:290
26732997446,16cyclictest20319-21tr10:55:220
2582927420,33sleep025877-21ps07:05:250
26732997249,15cyclictest3751-21runrttasks11:56:010
26732997246,16cyclictest3130-21cat09:50:020
26732997245,16cyclictest288-21snmpd07:43:300
26732997244,14cyclictest8534-21ntp_states12:15:220
26732997236,22cyclictest9677-21/usr/sbin/munin10:15:210
26732997146,14cyclictest17902-21ntp_states08:40:220
26732997144,16cyclictest13099-21seq12:33:310
26732997143,17cyclictest946-21ntpd12:05:220
26732997142,15cyclictest7060-21if_err_eth012:10:140
26732997046,14cyclictest19045-21irqstats08:45:180
26732997046,14cyclictest16367-21df_inode08:35:140
26732997046,13cyclictest2089-21ntp_states11:50:220
26732997045,15cyclictest13689-21ntpq12:35:220
26732997044,15cyclictest28937-21chrt09:23:330
26732997042,17cyclictest8580-21memory10:10:180
26732997042,16cyclictest30561-21sed11:35:180
26732997039,20cyclictest18816-21/usr/sbin/munin10:50:130
26732996947,12cyclictest31627-21runrttasks09:34:360
26732996944,14cyclictest22845-21missed_timers11:05:220
26732996846,12cyclictest21842-21ls11:00:260
26732996844,13cyclictest20186-21/usr/sbin/munin08:50:140
26732996843,15cyclictest4223-21runrttasks07:47:140
26732996842,14cyclictest10852-21/usr/sbin/munin12:25:260
26732996840,16cyclictest518-21munin-run09:40:020
26732996745,14cyclictest23804-21runrttasks09:03:570
26732996744,14cyclictest30061-21runrttasks11:33:270
26732996743,14cyclictest6030-21df07:55:140
26732996742,14cyclictest10476-21sshd12:23:020
26732996741,16cyclictest7349-21df_inode08:00:140
26732996731,22cyclictest26828-21/usr/sbin/munin07:10:140
26732996645,12cyclictest13721-21modprobe08:25:010
26732996644,12cyclictest27397-21seq11:22:380
26732996638,18cyclictest9560-21sshd08:08:390
26732996637,18cyclictest22033-21timerwakeupswit08:55:280
26732996632,20cyclictest512-21/usr/sbin/munin11:45:180
26732996630,19cyclictest25358-21/usr/sbin/munin09:10:150
26732996543,13cyclictest11201-21df_inode08:15:140
26732996541,14cyclictest31814-21seq07:29:380
26732996541,13cyclictest17393-21grep10:45:020
26732996534,19cyclictest13598-21runrttasks10:30:080
26732996531,22cyclictest12462-21/usr/sbin/munin08:20:170
26732996526,16cyclictest27825-21munin-run09:20:010
26732996441,14cyclictest15159-21irqstats08:30:140
26732996429,23cyclictest656-21/usr/sbin/munin09:40:150
26732996429,22cyclictest4393-21/usr/sbin/munin12:00:270
26732996338,13cyclictest6413-21users10:00:300
26732996135,15cyclictest24365-21ntp_states09:05:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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