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2025-10-23 - 19:54

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 20 highest latencies:
System rack4slot6s.osadl.org (updated Thu Oct 23, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
869121340,3chrt8692-21ls11:00:020
2832721230,2sleep028328-21sh10:10:140
902421210,4chrt9022-21ls08:55:170
14071991179,94cyclictest3740-21df08:35:130
14071991139,89cyclictest16929-21uname07:20:170
140719911327,73cyclictest22238-21/usr/sbin/munin11:50:290
14071991128,89cyclictest24258-21munin-run09:55:010
2562321110,4sleep025559-21/usr/sbin/munin12:05:160
14071991119,87cyclictest16941-21ntp_states09:25:250
14071991108,89cyclictest27434-21/usr/sbin/munin12:10:290
14071991107,90cyclictest28379-21/usr/sbin/munin12:15:210
14071991107,89cyclictest10443-21ntp_states09:00:210
14071991106,91cyclictest19806-21/usr/sbin/munin09:35:290
140719911010,88cyclictest30733-21munin-run10:20:010
14071991099,88cyclictest2450-21memory10:35:170
14071991099,87cyclictest9914-21munin-run11:05:010
14071991099,86cyclictest4991-21seq08:40:090
14071991097,88cyclictest2993-21users08:30:290
14071991097,88cyclictest23483-21netstat07:45:210
14071991097,87cyclictest32454-21/usr/sbin/munin08:20:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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