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2026-07-23 - 06:37

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 Thu Jul 23, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1627322570,2sleep016270-21grep00:30:010
2763422440,2sleep027633-21sed23:05:170
31531214218,31sleep031581-21df19:05:110
2516121200,4chrt25163-21open_files22:55:240
2942221190,2chrt29423-21sshd23:11:060
831121160,4chrt8308-21ps21:45:250
1816621130,3chrt18168-21sh22:25:010
1276821120,4sleep012473-21/usr/sbin/munin00:15:220
341221030,3sleep03477-21wc19:20:270
153721020,3sleep01591-21/usr/sbin/munin23:30:160
236272990,3sleep023677-21df20:40:110
237642889,67sleep023575-21/usr/sbin/munin22:50:200
54042850,4sleep05418-21munin-plugin-st19:30:000
6512760,2sleep0650-21grep19:10:200
164972704,55sleep016502-21irqstats00:30:160
51902694,56sleep05205-21munin-run23:45:010
32732996822,16cyclictest15064-21/usr/sbin/munin20:05:280
3273299629,18cyclictest30089-21/usr/sbin/munin21:05:350
32732996238,16cyclictest21445-21/usr/sbin/munin20:30:260
32732996110,15cyclictest31210-21modprobe23:20:010
3273299609,17cyclictest31370-21/usr/sbin/munin21:10:160
32732996034,16cyclictest9495-21/usr/sbin/munin21:50:190
32732996030,20cyclictest0-21swapper00:36:130
32732995935,16cyclictest5806-21/usr/sbin/munin23:45:260
32732995919,15cyclictest297702chrt21:03:330
32732995919,13cyclictest32626-21/usr/sbin/munin23:25:230
32732995911,14cyclictest6610-21/usr/sbin/munin23:50:280
3273299589,16cyclictest20868-21systemctl22:39:590
3273299588,17cyclictest13797-21/usr/sbin/munin00:20:190
3273299587,17cyclictest17333-21/usr/sbin/munin20:15:180
32732995834,15cyclictest13389-21/usr/sbin/munin20:00:150
32732995833,14cyclictest18646-21/usr/sbin/munin22:25:230
32732995821,14cyclictest5413-21cpu21:35:130
3273299579,17cyclictest1710-21/usr/sbin/munin19:15:120
3273299579,16cyclictest22354-21df_inode22:45:140
3273299579,15cyclictest3324-21users23:35:290
3273299578,16cyclictest285-21sshd20:57:260
3273299578,15cyclictest15866-21/usr/sbin/munin20:10:270
3273299577,18cyclictest11832-21/usr/sbin/munin22:00:290
3273299577,15cyclictest6826-21/usr/sbin/munin19:35:250
32732995734,15cyclictest8394-21/usr/sbin/munin19:40:210
32732995734,15cyclictest5805-21/usr/sbin/munin19:30:200
32732995734,15cyclictest19221-21runrttasks20:21:400
32732995733,15cyclictest2930-21/usr/sbin/munin21:25:160
32732995733,15cyclictest27014-21runrttasks23:02:260
32732995732,17cyclictest32706-21/usr/sbin/munin21:15:120
32732995732,16cyclictest31450-21/usr/sbin/munin23:20:150
32732995710,21cyclictest22913-21users20:35:310
32732995710,16cyclictest9486-21ntp_states00:00:200
3273299568,16cyclictest25093-21memory20:45:150
3273299568,14cyclictest14409-21/usr/sbin/munin22:10:190
3273299567,15cyclictest10525-21/usr/sbin/munin21:55:310
32732995632,16cyclictest12258-21/usr/sbin/munin19:55:210
32732995631,15cyclictest10029-21runrttasks19:45:310
32732995610,15cyclictest10991-21ntp_states19:50:230
32732995610,14cyclictest26805-21/usr/sbin/munin20:50:340
3273299557,15cyclictest4086-21egrep21:30:130
3273299556,16cyclictest15686-21/usr/sbin/munin22:15:100
32732995532,15cyclictest7978-21/usr/sbin/munin23:55:150
32732995511,13cyclictest20019-21/usr/sbin/munin20:25:210
3273299549,18cyclictest22099-21chrt22:44:330
3273299549,12cyclictest13125-21/usr/sbin/munin22:05:270
3273299546,17cyclictest10756-21ntpq00:05:210
32732995431,15cyclictest1834-21/usr/sbin/munin21:20:250
3273299537,18cyclictest6940-21/usr/sbin/munin21:40:190
32732995213,14cyclictest31181-21kworker/u2:000:10:020
32732995128,15cyclictest19911-21runrttasks22:33:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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