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2026-03-06 - 20:12

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 highest latencies:
System rack4slot6s.osadl.org (updated Fri Mar 06, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
162622370,2sleep01627-21cut11:45:010
3167521180,3sleep031673-21grep09:30:020
224421140,4chrt2245-21ntp_kernel_pll_07:35:200
1237021140,4sleep012309-21/usr/sbin/munin08:15:140
874421020,3sleep08758-21awk12:10:270
1490221000,3sleep014900-21if_eth010:30:160
137762980,3sleep013817-21memory08:20:180
49332910,3sleep05003-21mailstats07:45:260
139142860,3sleep013917-21vmstat12:30:300
320202780,3sleep032030-21grep07:25:160
58512745,7sleep00-21swapper07:50:070
27889996832,26cyclictest25334-21/usr/sbin/munin11:10:190
27889996830,27cyclictest29327-21/usr/sbin/munin07:15:110
2727526817,29sleep027284-21users07:05:290
27889996733,26cyclictest27674-21latency_hist11:20:030
27889996538,18cyclictest9886-21/usr/sbin/munin08:05:140
27889996436,16cyclictest8824-21/usr/sbin/munin10:05:270
27889996436,16cyclictest19733-21chrt10:49:220
27889996335,18cyclictest20149-21/usr/sbin/munin08:45:150
27889996333,21cyclictest21638-21/usr/sbin/munin10:55:250
27889996234,15cyclictest14889-21ntp_states12:35:220
27889996136,16cyclictest4157-21runrttasks09:49:020
27889996133,17cyclictest11040-21ntp_states12:20:220
27889996119,28cyclictest29191-21memory11:25:180
2788999608,17cyclictest23880-21df11:05:120
27889996036,14cyclictest9670-21/usr/sbin/munin10:10:140
27889996035,13cyclictest1994-21seq11:45:220
2788999599,16cyclictest18672-21sendmail-msp08:40:010
27889995934,16cyclictest25347-21/usr/sbin/munin09:05:160
27889995934,14cyclictest12468-21ntpq10:20:220
27889995911,15cyclictest21498-21irqstats08:50:150
2788999589,18cyclictest6871-21/usr/sbin/munin12:05:260
2788999589,17cyclictest14912-21/usr/sbin/munin08:25:230
27889995834,16cyclictest5895-21/usr/sbin/munin09:55:180
27889995834,15cyclictest20006-21/usr/sbin/munin10:50:140
27889995834,15cyclictest10253-21chrt12:17:100
27889995833,16cyclictest5745-21/usr/sbin/munin12:00:180
27889995833,15cyclictest27985-21/usr/sbin/munin09:15:180
27889995831,15cyclictest3046-21sed09:45:020
27889995829,18cyclictest26807-21/usr/sbin/munin09:10:210
27889995826,20cyclictest17379-21/usr/sbin/munin10:40:140
27889995820,11cyclictest11131-21ntpq10:15:190
27889995810,16cyclictest3294-21/usr/sbin/munin07:40:180
2788999578,16cyclictest22638-21/usr/sbin/munin08:55:190
2788999578,15cyclictest24030-21/usr/sbin/munin09:00:140
2788999578,15cyclictest16197-21/usr/sbin/munin08:30:280
2788999577,16cyclictest3500-21grep11:50:270
27889995733,16cyclictest12297-21/usr/sbin/munin12:25:200
27889995732,16cyclictest9047-21users08:00:300
27889995732,16cyclictest1004-21/usr/sbin/munin09:35:260
27889995731,15cyclictest288-21snmpd09:34:020
27889995730,18cyclictest16123-21df10:35:140
27889995710,17cyclictest5179-21chrt11:58:000
27889995710,17cyclictest22841-21/usr/sbin/munin11:00:240
2788999569,14cyclictest27829-21if_eth011:20:150
2788999567,17cyclictest307-21munin-node11:30:090
2788999567,16cyclictest11082-21chrt08:10:120
2788999567,15cyclictest18786-21/usr/sbin/munin08:40:170
27889995631,16cyclictest772-21/usr/sbin/munin07:30:150
27889995630,15cyclictest31615-21grep11:35:100
27889995629,16cyclictest29138-21/usr/sbin/munin09:20:140
27889995623,20cyclictest4402-21seq09:50:090
2788999559,17cyclictest27992-21/usr/sbin/munin07:10:180
2788999558,16cyclictest31232-21sshd07:20:450
2788999558,13cyclictest13507-21/usr/sbin/munin10:25:150
27889995528,16cyclictest7457-21/usr/sbin/munin07:55:220
2788999549,16cyclictest7314-21/usr/sbin/munin10:00:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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