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2026-05-18 - 02:03

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 all highest latencies:
System rack4slot6s.osadl.org (updated Mon May 18, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
316322580,3sleep03164-21cat21:00:310
1809222530,2sleep018093-21sh19:55:000
3148121250,4chrt31480-21/usr/sbin/munin22:50:260
1973421240,2sleep019733-21timerandwakeup00:10:270
1568521200,4chrt15686-21processes23:55:240
2577421170,2sleep025775-21cat00:35:150
2198121170,3chrt21977-21latency00:20:160
1714521170,2sleep017144-21cat00:00:270
6510991147,94cyclictest21707-21runrttasks00:20:020
6510991145,14cyclictest13247-21memory19:35:180
65109911410,90cyclictest6892-21ntp_states19:10:210
6510991139,89cyclictest28907-21/usr/sbin/munin20:35:250
6510991138,92cyclictest10769-21sendmail_mailst21:30:260
6510991138,91cyclictest6323-21/usr/sbin/munin23:20:300
6510991136,14cyclictest9272-21df_inode19:20:130
65109911310,89cyclictest7317-21chrt21:17:220
6510991129,13cyclictest22025-21df22:15:140
6510991128,92cyclictest22393-21runrttasks20:10:220
6510991128,89cyclictest15709-21df19:45:140
6510991128,16cyclictest268352chrt20:27:290
6510991118,88cyclictest28732-21ntp_states22:40:210
6510991117,15cyclictest23796-21chrt00:26:140
6510991117,14cyclictest14394-21proc_pri23:50:260
6510991109,88cyclictest18405-21memory19:55:180
6510991108,89cyclictest8015-21seq19:15:170
6510991108,88cyclictest26184-21/usr/sbin/munin22:30:250
6510991108,88cyclictest24854-21ntp_states22:25:220
6510991108,88cyclictest20963-21irqstats20:05:170
6510991107,14cyclictest23386-21/usr/sbin/munin20:15:290
6510991107,14cyclictest19119-21chrt22:03:460
6510991107,12cyclictest18057-21wc22:00:010
6510991098,88cyclictest12072-21chrt19:30:220
6510991098,88cyclictest10777-21ntp_states19:25:220
6510991098,86cyclictest11790-21irqstats21:35:170
6510991096,13cyclictest772-21seq22:58:180
6510991087,86cyclictest21279-21/usr/sbin/munin22:10:300
6510991086,89cyclictest15113-21sshd19:41:370
6510991086,88cyclictest5930-21seq21:11:370
6510991086,87cyclictest14523-21ntp_states21:45:210
6510991086,13cyclictest16778-21latency_hist21:55:020
65109910825,71cyclictest27184-21df22:35:100
1183821080,3chrt11841-21processes23:40:250
6510991079,87cyclictest8363-21timerwakeupswit21:20:290
6510991079,86cyclictest19075-21seq00:09:580
6510991068,85cyclictest29923-21sh20:40:140
6510991068,82cyclictest24385-21/usr/sbin/munin00:30:190
6510991068,11cyclictest1015-21runrttasks20:54:090
6510991067,85cyclictest32368-21latency_hist20:50:010
6510991067,85cyclictest27884-21runrttasks20:30:340
6510991067,85cyclictest25899-21grep20:25:020
6510991066,13cyclictest10617-21mailstats23:35:250
65109910628,66cyclictest23547-21/usr/sbin/munin22:20:200
6510991059,69cyclictest13467-21/usr/sbin/munin21:40:280
6510991057,86cyclictest9368-21ntp_states21:25:210
6510991057,85cyclictest9656-21chrt23:31:500
6510991057,85cyclictest2439-21/usr/sbin/munin23:05:130
6510991056,87cyclictest19819-21ntp_states20:00:210
6510991056,12cyclictest3774-21df23:10:140
6510991056,11cyclictest5064-21df_inode23:15:130
6510991055,14cyclictest19591-21memory22:05:170
6510991048,84cyclictest13953-21cat23:50:010
6510991048,84cyclictest1290-21irqstats23:00:180
6510991046,85cyclictest7899-21ntpq23:25:210
6510991046,14cyclictest4630-21seq21:06:340
6510991046,12cyclictest30016-21ntp_states22:45:220
65109910410,71cyclictest2423-21munin-run21:00:010
65109910013,78cyclictest6515-21latency_hist19:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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