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2026-05-15 - 01:53

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 Thu May 14, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
230222410,3sleep02303-21readlink07:15:260
3182522180,2sleep031824-21cat11:15:250
950221260,2sleep09500-21entropy09:50:130
1486621200,4chrt14859-21mailstats12:15:250
860721190,4chrt8605-21awk07:40:190
345821030,3sleep03456-21ntp_states07:20:200
2118121030,3sleep021177-21cat08:30:010
896021020,3sleep08961-21sshd11:53:420
2677021010,3sleep026825-21/usr/sbin/munin08:50:250
144682970,4sleep014481-21munin-plugin-st10:10:000
463999572,13cyclictest4171-21awk11:35:140
463999564,18cyclictest6755-21sendmail-msp09:40:000
72562940,3sleep07258-21timerwakeupswit11:45:280
185522940,3sleep018616-21latency_hist08:20:020
463998961,15cyclictest29276-21ntp_states09:00:240
463998756,19cyclictest10959-21df_inode07:50:130
463998663,13cyclictest114-21systemd-journal11:29:590
463998660,15cyclictest17155-21seq08:14:330
463998556,20cyclictest3090-21idleruntime09:25:150
463998554,19cyclictest29954-21chrt11:09:550
277392850,4sleep027788-21/usr/sbin/munin11:00:200
66342840,4sleep0288-21snmpd07:32:540
463998460,13cyclictest8286-21cat09:45:150
463998455,19cyclictest31154-21seq09:07:460
463998360,14cyclictest16179-21ntp_states10:15:230
463998357,15cyclictest17609-21users12:25:260
463998255,18cyclictest4733-21ntpq07:25:210
463998253,20cyclictest4390-21/usr/sbin/munin09:30:150
463998058,13cyclictest11015-21ntp_states09:55:230
463998057,13cyclictest20489-21chrt10:31:240
463998054,15cyclictest9529-21grep11:55:210
463997958,13cyclictest30233-21interrupts11:10:140
463997955,15cyclictest31928-21processes09:10:270
463997955,14cyclictest6562-21latency_hist11:45:000
463997952,18cyclictest13931-21/usr/sbin/munin08:00:260
3173227923,32sleep031782-21df07:05:120
463997856,12cyclictest276-21runrttasks08:07:100
463997855,14cyclictest23882-21df_inode08:40:120
463997754,13cyclictest276-21runrttasks08:56:030
463997655,12cyclictest828-21users11:20:290
463997653,13cyclictest276-21runrttasks07:39:050
463997554,13cyclictest13191-21modprobe10:05:010
463997453,11cyclictest26518-21open_files10:55:240
463997452,15cyclictest1205-21sshd07:10:430
463997452,13cyclictest21273-21egrep08:30:090
463997253,12cyclictest981-21users09:15:290
463997232,28cyclictest23990-21/usr/sbin/munin10:45:240
463996850,8cyclictest257512sleep010:52:170
463996751,10cyclictest12441-21users12:05:280
463996748,10cyclictest231902chrt10:42:180
463996446,9cyclictest168762chrt12:24:540
463996410,20cyclictest22226-21munin-run10:40:000
463996346,8cyclictest128562chrt07:56:020
463996346,7cyclictest205622chrt12:38:330
463996144,8cyclictest191732chrt12:32:400
463996035,15cyclictest10626-21/usr/sbin/munin12:00:130
46399588,17cyclictest17205-21/usr/sbin/munin10:20:140
463995834,15cyclictest7440-21/usr/sbin/munin09:40:290
463995832,15cyclictest2475-21runrttasks09:21:450
46399579,17cyclictest13186-21df12:10:110
46399579,16cyclictest19196-21sed08:20:270
463995734,15cyclictest22763-21/usr/sbin/munin08:35:190
463995710,20cyclictest9905-21ntp_states07:45:200
46399569,17cyclictest14792-21seq10:10:170
463995632,15cyclictest25406-21/usr/sbin/munin08:45:240
46399559,18cyclictest2853-21cpu11:30:090
463995430,15cyclictest18777-21ntp_states10:25:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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