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2026-04-01 - 06:37

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 Wed Apr 01, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
506523050,2sleep05066-21if_eth021:10:160
2804822390,4sleep028051-21modprobe22:40:000
910421410,2sleep09105-21ntpq21:25:200
63089912710,87cyclictest16685-21ntp_states00:00:210
2492021220,4chrt24918-21df_inode00:35:130
982821190,3chrt9824-21latency_hist23:35:010
6308991199,82cyclictest10114-21/usr/sbin/munin21:30:200
63089911535,70cyclictest22131-21/usr/sbin/munin22:15:230
6308991148,91cyclictest6226-21/usr/sbin/munin21:15:170
63089911430,74cyclictest31342-21runrttasks20:45:260
1542221140,3chrt15421-21/usr/sbin/munin21:50:170
6308991138,90cyclictest6998-21users19:10:300
6308991137,92cyclictest25787-21/usr/sbin/munin20:25:170
63089911229,71cyclictest14067-21/usr/sbin/munin21:45:140
63089911131,70cyclictest19453-21/usr/sbin/munin20:00:150
63089911128,71cyclictest19308-21/usr/sbin/munin22:05:180
6308991109,88cyclictest27900-21sshd20:32:210
6308991107,88cyclictest18395-21/usr/sbin/munin00:10:210
63089911025,74cyclictest12857-21/usr/sbin/munin19:35:250
6308991098,77cyclictest6677-21users23:20:290
63089910928,71cyclictest285-21sshd23:07:210
63089910926,72cyclictest20872-21sshd20:05:200
6308991089,83cyclictest29774-21sshd22:45:210
6308991088,85cyclictest30955-21memory22:50:170
6308991087,87cyclictest18314-21ntp_states19:55:250
6308991087,87cyclictest10349-21df_inode19:25:140
6308991079,85cyclictest24328-21/usr/sbin/munin22:25:220
63089910727,70cyclictest32553-21/usr/sbin/munin20:50:230
6308991069,85cyclictest22085-21memory20:10:170
6308991069,84cyclictest20280-21users00:15:290
6308991068,85cyclictest9961-21chrt19:23:220
6308991067,86cyclictest3696-21df21:05:090
6308991067,84cyclictest16560-21/usr/sbin/munin21:55:120
6308991066,86cyclictest307-21munin-node23:50:090
63089910629,66cyclictest11393-21/usr/sbin/munin23:40:180
63089910627,68cyclictest4757-21/usr/sbin/munin23:15:120
63089910625,71cyclictest13658-21sshd21:43:210
63089910622,72cyclictest23097-21/usr/sbin/munin22:20:120
6308991059,83cyclictest25900-21ntp_states22:30:210
6308991059,83cyclictest22568-21ntpq00:25:210
6308991058,85cyclictest32318-21tr22:55:210
6308991058,85cyclictest10223-21ntp_states23:35:210
6308991058,81cyclictest28199-21/usr/sbin/munin22:40:180
6308991057,84cyclictest17172-21/usr/sbin/munin19:50:260
63089910525,70cyclictest2364-21/usr/sbin/munin21:00:210
63089910510,82cyclictest15378-21sshd23:55:220
6308991048,85cyclictest21296-21ntp_states00:20:210
6308991048,84cyclictest11860-21ntp_states19:30:220
6308991048,69cyclictest1632-21cat20:55:280
6308991047,85cyclictest29950-21ntp_states20:40:210
6308991047,84cyclictest7424-21df_inode23:25:130
6308991047,84cyclictest4711-21latency_hist23:15:020
6308991047,84cyclictest18740-21seq22:02:370
6308991046,85cyclictest7876-21memory19:15:180
63089910425,67cyclictest18063-21runrttasks00:08:180
63089910423,69cyclictest12523-21/usr/sbin/munin23:45:230
63089910328,65cyclictest1-21systemd21:25:010
63089910327,65cyclictest25458-21runrttasks20:23:230
6308991029,82cyclictest23634-21df_inode00:30:130
6308991028,83cyclictest1821-21seq23:03:010
6308991027,71cyclictest11909-21cat21:35:260
6308991019,79cyclictest15637-21memory19:45:180
6308991017,83cyclictest23615-21mailstats20:15:250
63089910018,72cyclictest15327-21sh19:45:010
630899999,76cyclictest28599-21ntpq20:35:180
630899995,82cyclictest20505-21df_inode22:10:130
630899939,71cyclictest6375-21ls19:10:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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