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2026-07-07 - 13:59

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Tue Jul 07, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2986622540,3sleep029869-21latency_hist11:10:010
1761522460,3sleep017613-21awk08:15:230
2675021480,3sleep026752-21switchtime08:50:260
32756214618,33sleep032757-21cron07:10:000
442321210,4chrt4422-21/usr/sbin/munin09:30:200
3112121210,2sleep031123-21cron11:15:000
974921190,3chrt9746-21ntpq07:45:210
340991197,24cyclictest22311-21cut08:35:020
3409911930,16cyclictest12737-21runrttasks12:08:510
3409911927,15cyclictest27454-21runrttasks11:00:120
3409911831,14cyclictest15880-21latency_hist08:10:010
3409911729,15cyclictest2606-21runrttasks09:23:540
3409911729,14cyclictest11480-21runrttasks12:04:040
3409911728,15cyclictest5567-21latency_hist07:30:020
3409911629,14cyclictest13552-21/usr/sbin/munin08:00:180
3409911628,16cyclictest19208-21runrttasks10:27:280
3409911627,17cyclictest17660-21runrttasks12:26:260
3409911529,12cyclictest1367-21runrttasks07:13:070
3409911525,17cyclictest25764-21runrttasks10:53:250
3409911523,15cyclictest1802-21/usr/sbin/munin11:25:250
3409911427,14cyclictest19346-21runrttasks12:34:490
3409911424,18cyclictest9454-21/usr/sbin/munin11:55:250
3409911410,18cyclictest26281-21memory10:55:200
3409911327,14cyclictest10322-21runrttasks09:53:520
3409911327,13cyclictest16306-21runrttasks12:21:120
3409911326,14cyclictest18121-21runrttasks10:24:070
3409911324,17cyclictest11367-21users07:50:270
3409911324,15cyclictest5711-21/usr/sbin/munin07:30:170
3409911320,15cyclictest3298-21/usr/sbin/munin07:20:180
340991127,14cyclictest22390-21/usr/sbin/munin08:35:270
3409911227,14cyclictest15568-21latency_hist12:20:020
3409911211,19cyclictest8220-21memory09:45:180
340991119,20cyclictest22166-21date10:40:030
3409911126,13cyclictest12722-21runrttasks07:55:590
3409911125,12cyclictest7226-21runrttasks11:45:570
3409911120,16cyclictest16066-21awk10:15:240
340991107,17cyclictest30742-21runrttasks09:05:290
3409911026,14cyclictest20481-21runrttasks10:32:230
3409911024,15cyclictest3505-21runrttasks11:32:160
1472921100,3chrt14727-21netstat10:10:210
340991099,15cyclictest12052-21irqstats10:00:180
3409910919,22cyclictest276-21runrttasks08:20:130
340991089,17cyclictest10593-21/usr/sbin/munin09:55:230
340991087,14cyclictest288-21snmpd11:50:170
3409910826,16cyclictest20799-21runrttasks08:28:330
340991078,14cyclictest24485-21sshd10:48:280
340991078,14cyclictest22532-21ntp_states10:40:200
340991077,14cyclictest32630-21df11:20:130
340991076,11cyclictest31523-21runrttasks11:15:210
3409910727,14cyclictest2494-21runrttasks07:16:490
3409910724,15cyclictest1507-21latency_hist09:20:020
340991068,16cyclictest5580-21/usr/sbin/munin09:35:170
340991068,16cyclictest24183-21/usr/sbin/munin08:40:280
340991068,14cyclictest8207-21/usr/sbin/munin07:40:190
3409910629,13cyclictest28284-21runrttasks08:56:340
3409910611,19cyclictest16192-21ntpq08:10:190
340991059,27cyclictest19790-21ntp_states12:35:210
340991059,23cyclictest25278-21ntp_states08:45:240
340991057,16cyclictest7033-21ntp_states09:40:210
3409910522,15cyclictest32115-21runrttasks09:11:010
3409910510,16cyclictest13009-21/usr/sbin/munin12:10:090
340991049,14cyclictest2935-21df_inode09:25:150
340991047,27cyclictest28916-21df_inode09:00:120
340991037,14cyclictest5714-21runrttasks11:40:260
3409910310,15cyclictest13258-21df_inode10:05:130
340991027,14cyclictest5132-21latency_hist11:40:010
340991007,14cyclictest7191-21ntp_states07:35:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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