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2026-04-16 - 19:46

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 Apr 16, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1511122520,2sleep015114-21timerwakeupswit07:20:270
2871421330,4chrt28567-21/usr/sbin/munin10:20:160
1833621270,4chrt18334-21ntp_states11:45:210
1956321230,4chrt19565-21modprobe07:40:000
1978821170,4chrt19784-21ntpq09:45:200
2698221140,2sleep026983-21grep12:20:010
3157421120,3sleep031137-21/usr/sbin/munin10:30:280
2816921070,3sleep028170-21sshd12:24:210
1681821070,3sleep016814-21cat09:35:010
1465721030,3sleep014687-21/usr/sbin/munin09:25:230
26952970,3sleep02706-21wc10:45:180
18282940,2sleep01827-21wc08:35:260
219232880,3sleep021931-21wc12:00:110
11835997950,19cyclictest13349-21/usr/sbin/munin07:15:150
11835997853,16cyclictest20490-21cron11:55:010
11835997651,14cyclictest13161-21ntpq11:25:220
11835997647,18cyclictest24499-21grep12:10:100
11835997546,18cyclictest15457-21/usr/sbin/munin11:35:170
11835997544,18cyclictest26151-21/usr/sbin/munin08:05:260
11835997343,19cyclictest4120-21ntp_states10:50:210
11835997248,15cyclictest32337-21runrttasks08:28:570
11835997248,14cyclictest18094-21latency_hist09:40:010
11835997248,14cyclictest17742-21runrttasks11:43:340
11835997246,16cyclictest14074-21runrttasks09:23:440
11835997245,15cyclictest30322-21seq12:30:530
249252710,2sleep024926-21/usr/sbin/munin08:00:120
11835997146,13cyclictest12759-21seq09:18:420
11835997145,16cyclictest31306-21processes12:35:260
11835997144,15cyclictest9150-21/usr/sbin/munin11:10:180
11835997125,19cyclictest11936-21/usr/sbin/munin07:10:160
11835997046,14cyclictest9360-21chrt09:05:170
11835997044,15cyclictest6759-21/usr/sbin/munin11:00:250
11835997043,16cyclictest276-21runrttasks08:55:130
11835997039,21cyclictest32475-21df10:35:130
11835996943,15cyclictest20937-21irqstats09:50:130
11835996941,18cyclictest24469-21runrttasks10:04:210
11835996934,21cyclictest23432-21modprobe07:55:000
11835996932,23cyclictest5118-21/usr/sbin/munin10:55:320
11835996846,13cyclictest21726-21runrttasks11:59:410
11835996845,13cyclictest276-21runrttasks07:31:180
11835996842,16cyclictest8003-21ntp_states11:05:220
11835996842,14cyclictest12202-21awk11:20:300
11835996840,17cyclictest2489-21latency_hist10:45:020
11835996743,14cyclictest19910-21cat07:40:180
11835996742,17cyclictest28424-21sendmail10:20:010
11835996741,15cyclictest28362-21latency_hist12:25:020
11835996732,22cyclictest4015-21/usr/sbin/munin08:45:280
11835996729,27cyclictest15875-21/usr/sbin/munin07:25:100
11835996722,19cyclictest2730-21/usr/sbin/munin08:40:310
11835996644,12cyclictest24141-21users07:55:300
11835996643,14cyclictest11076-21/usr/sbin/munin09:10:300
11835996642,16cyclictest10569-21ntp_states11:15:220
11835996642,15cyclictest14235-21df_inode11:30:140
11835996628,15cyclictest28411-21seq08:13:360
11835996543,15cyclictest5350-21runrttasks08:50:130
11835996542,12cyclictest24742-21df10:05:140
11835996539,15cyclictest18296-21df_inode09:40:130
11835996537,18cyclictest22273-21memory09:55:180
11835996533,18cyclictest28997-21ntp_states08:15:220
11835996531,13cyclictest30912-21seq10:29:160
11835996530,23cyclictest30033-21/usr/sbin/munin08:20:240
11835996440,14cyclictest302-21grep08:30:180
11835996440,14cyclictest21898-21runrttasks07:48:040
11835996438,15cyclictest25967-21/usr/sbin/munin10:10:140
11835996436,14cyclictest23468-21ntpq12:05:200
11835996431,22cyclictest7882-21/usr/sbin/munin09:00:250
1109626017,23sleep011165-21timerandwakeup07:05:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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