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2026-07-01 - 08:07

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 01, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1402622450,2sleep014029-21sh00:15:000
1075021260,3chrt10748-21sendmail-msp00:00:010
745421200,4chrt7453-21if_eth019:35:140
898321170,2sleep08982-21timerandwakeup21:45:280
2925421170,3chrt29255-21latency_hist21:00:030
880821150,3sleep08810-21timerandwakeup23:50:280
778991139,91cyclictest2449-21ntp_states19:15:220
778991129,89cyclictest27532-21chrt20:52:220
778991129,89cyclictest17661-21irqstats22:20:180
778991129,87cyclictest5015-21sshd23:35:340
778991127,14cyclictest31834-21irqstats23:15:180
778991119,89cyclictest276-21runrttasks00:27:460
778991118,90cyclictest19417-21grep00:35:140
778991118,89cyclictest18944-21irqstats22:25:180
778991116,15cyclictest25143-21latency_hist22:50:010
778991109,87cyclictest15098-21memory22:10:180
778991108,13cyclictest26381-21chrt22:54:580
778991107,89cyclictest17846-21memory20:15:180
7789911027,73cyclictest436-21runrttasks21:13:590
7789911010,87cyclictest12803-21latency_hist00:10:020
615921100,3sleep06160-21if_err_eth019:30:150
778991098,89cyclictest8928-21ntp_states19:40:220
778991098,88cyclictest26009-21users20:45:300
778991097,88cyclictest5997-21cat19:30:020
778991096,14cyclictest2087-21df21:20:140
778991096,14cyclictest10401-21seq21:50:530
778991096,13cyclictest114-21systemd-journal20:25:580
778991089,87cyclictest7266-21ntpq23:45:220
778991089,87cyclictest16965-21users20:10:300
778991089,85cyclictest30482-21/usr/sbin/munin23:10:140
778991088,87cyclictest23011-21memory20:35:180
778991087,87cyclictest22836-21/usr/sbin/munin22:40:180
778991087,87cyclictest18269-21chrt00:30:180
778991087,14cyclictest21275-21grep22:35:020
778991086,15cyclictest1478-21seq23:23:100
7789910831,67cyclictest3633-21/usr/sbin/munin23:30:280
778991079,86cyclictest5988-21if_eth021:35:140
778991079,86cyclictest21604-21sh20:30:130
778991079,86cyclictest1505-21chrt21:17:010
778991079,84cyclictest1896-21df_inode23:25:140
778991078,85cyclictest3546-21df_inode19:20:140
778991077,14cyclictest1027-21irqstats19:10:180
778991077,13cyclictest14394-21users20:00:300
778991077,12cyclictest6170-21mailstats23:40:260
778991077,12cyclictest4649-21df_inode21:30:140
778991076,86cyclictest11456-21/usr/sbin/munin00:00:300
7789910728,69cyclictest31818-21latency_hist21:10:000
7789910722,72cyclictest26576-21df_inode22:55:130
7789910714,82cyclictest7371-21runrttasks21:40:180
778991069,85cyclictest13084-21users19:55:300
778991069,84cyclictest28179-21seq23:00:260
778991068,87cyclictest3413-21if_eth021:25:140
778991066,86cyclictest24416-21/usr/sbin/munin20:40:220
778991066,14cyclictest12625-21ntp_states22:00:210
778991066,13cyclictest30310-21chrt23:10:020
778991059,79cyclictest29291-21/usr/sbin/munin21:00:140
778991058,86cyclictest16343-21latency_hist20:10:020
778991058,86cyclictest14786-21chrt00:15:410
778991058,84cyclictest21423-21df_inode22:35:130
778991058,12cyclictest9926-21/usr/sbin/munin19:45:100
778991057,10cyclictest13693-21df_inode22:05:140
778991056,9cyclictest163112sleep000:22:020
778991056,11cyclictest16331-21awk22:15:140
7789910528,69cyclictest11222-21runrttasks21:55:200
7789910429,65cyclictest19798-21runrttasks20:22:150
778991027,11cyclictest11267-21df_inode19:50:140
77899995,81cyclictest826-21latency_hist19:10:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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