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2026-03-08 - 02:24

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Sun Mar 08, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
718222500,2sleep07180-21ntpq20:50:200
3171122260,2sleep031713-21cut00:30:260
2013521380,3sleep020136-21uname19:35:160
3177021230,4chrt31503-21/usr/sbin/munin22:25:190
2253921220,4chrt22538-21/usr/sbin/munin21:50:150
1079921210,4chrt10798-21/usr/sbin/munin23:10:160
1914421200,3chrt18533-21/usr/sbin/munin21:35:300
134429911810,92cyclictest27055-21users20:00:290
187421160,3chrt1873-21/usr/sbin/munin20:30:160
134429911611,90cyclictest19805-21/usr/sbin/munin23:45:130
3138321150,4chrt31385-21ls22:25:000
106821150,4chrt1067-21sshd00:38:110
134429911410,90cyclictest16440-21chrt23:30:330
134429911319,83cyclictest9344-21cut23:05:010
134429911311,88cyclictest3110-21/usr/sbin/munin22:40:180
1349721120,3chrt13495-21ls19:10:020
13442991128,91cyclictest21620-21/usr/sbin/munin21:45:260
13442991128,90cyclictest26582-21chrt22:05:210
3013521110,3chrt30137-21latency_hist22:20:010
13442991119,89cyclictest13588-21df19:10:090
13442991119,85cyclictest26153-21/usr/sbin/munin00:10:180
134429911133,67cyclictest11378-21/usr/sbin/munin21:05:280
134429911131,70cyclictest17834-21/usr/sbin/munin19:25:250
13442991107,88cyclictest30383-21/usr/sbin/munin20:15:140
134429911010,85cyclictest24154-21ntp_states19:50:210
13442991099,87cyclictest23837-21ntpq00:00:210
13442991098,88cyclictest8472-21ntp_states20:55:210
13442991098,88cyclictest1672-21df_inode22:35:130
13442991097,87cyclictest21055-21cat21:45:010
134429910922,75cyclictest13113-21runrttasks21:14:040
13442991089,87cyclictest13114-21munin-run23:20:010
13442991088,88cyclictest16157-21memory21:25:170
13442991088,87cyclictest4490-21ntp_states22:45:210
13442991088,74cyclictest18711-21/usr/sbin/munin19:30:190
13442991087,87cyclictest63552sleep020:46:330
13442991087,86cyclictest13833-21mailstats21:15:250
13442991086,88cyclictest29661-21runrttasks00:23:020
13442991077,87cyclictest276-21runrttasks23:44:050
13442991077,87cyclictest17442-21memory21:30:170
13442991077,86cyclictest27725-21seq00:15:210
13442991076,88cyclictest22559-21seq19:45:010
134429910729,67cyclictest23606-21runrttasks19:48:570
13442991067,87cyclictest7062-21ntp_states22:55:210
13442991067,86cyclictest5927-21mailstats22:50:260
13442991066,10cyclictest21173-21memory23:50:170
134429910629,67cyclictest24520-21runrttasks21:57:210
134429910628,67cyclictest209-21dbus-daemon23:35:280
134429910610,84cyclictest25252-21netstat22:00:210
13442991059,82cyclictest4389-21chrt20:40:110
13442991058,84cyclictest14623-21/usr/sbin/munin23:25:140
13442991057,85cyclictest28169-21users22:10:290
13442991057,84cyclictest3312-21ntp_states20:35:210
13442991048,85cyclictest22859-21users23:55:290
13442991048,81cyclictest31263-21latency_hist00:30:010
13442991047,86cyclictest25281-21awk00:05:250
13442991047,85cyclictest16204-21df_inode19:20:130
13442991047,85cyclictest1587-21date22:35:020
13442991046,87cyclictest891-21cut20:25:250
13442991045,87cyclictest9846-21ps21:00:260
134429910422,68cyclictest13450-21memory23:20:190
13442991038,84cyclictest15882-21ls21:25:010
13442991038,83cyclictest32231-21users20:20:290
13442991038,83cyclictest15012-21memory19:15:170
13442991036,84cyclictest25942-21chrt19:57:010
13442991029,82cyclictest28040-21ntp_states20:05:210
13442991027,86cyclictest29096-21df_inode20:10:130
13442999820,67cyclictest10420-21sshd23:09:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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