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2025-11-30 - 17:59

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 50 highest latencies:
System rack4slot6s.osadl.org (updated Sun Nov 30, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1591421610,5sleep015915-21ntpq10:55:210
279721420,4chrt2795-21df_inode10:05:150
784821370,3sleep07849-21cat08:20:000
1342721350,4chrt13424-21ps10:45:270
513121280,3sleep05132-21cut12:20:020
2739321230,2sleep027392-21forks11:40:170
3012121220,3sleep030122-21cat09:45:180
682721200,2sleep06830-21sort10:20:220
81221080,3sleep0810-21uptime07:50:320
2768721030,4sleep027701-21memory07:30:200
922421010,3sleep09226-21sed12:35:180
299572970,3sleep029958-21latency_hist07:40:000
212672970,4sleep021346-21grep09:10:270
226322930,5sleep022696-21sort09:15:290
96062880,4sleep09671-21awk10:30:290
84842825,66sleep08557-21sed08:20:290
52572820,4sleep05275-21/usr/sbin/munin12:20:150
39662820,3sleep03994-21latency_hist08:05:000
106042760,3sleep010620-21irqstats10:35:190
27722745,58sleep02781-21memory12:10:200
2103327420,30sleep021083-21df07:05:120
252202730,2sleep025221-21ntpq07:20:250
22237996426,28cyclictest0-21swapper07:40:270
2223799599,15cyclictest29871-21/usr/sbin/munin11:50:300
22237995911,16cyclictest12378-21/usr/sbin/munin08:35:280
2223799589,18cyclictest8450-21cat10:25:290
2223799588,18cyclictest23427-21/usr/sbin/munin11:25:300
2223799588,17cyclictest26514-21ntp_states07:25:220
22237995835,15cyclictest17549-21/usr/sbin/munin11:00:330
22237995811,16cyclictest13157-21/usr/sbin/munin08:40:140
22237995810,18cyclictest28673-21fw_packets11:45:160
22237995810,15cyclictest23625-21/usr/sbin/munin07:15:300
22237995810,15cyclictest14440-21/usr/sbin/munin08:45:290
2223799579,19cyclictest5356-21df_inode10:15:130
2223799579,18cyclictest108-21systemd-journal09:10:000
2223799579,15cyclictest24709-21/usr/sbin/munin11:30:320
2223799578,17cyclictest4348-21seq10:10:260
2223799578,16cyclictest5442-21sshd08:10:130
2223799578,15cyclictest22189-21snmpd10:40:180
22237995735,14cyclictest32688-21/usr/sbin/munin09:55:170
22237995734,15cyclictest24873-21df_inode09:25:140
22237995732,16cyclictest18791-21/usr/sbin/munin11:05:330
22237995711,17cyclictest27520-21chrt09:35:160
22237995710,15cyclictest22578-21grep11:20:280
2223799569,16cyclictest14546-21memory10:50:210
2223799569,15cyclictest269-21runrttasks07:47:570
2223799569,14cyclictest23521-21/usr/sbin/munin09:20:190
2223799568,18cyclictest10497-21latency_hist08:30:010
2223799568,15cyclictest17531-21grep08:55:280
2223799567,16cyclictest16315-21chrt08:50:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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