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2026-08-17 - 07:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack5slot7s.osadl.org (updated Mon Aug 17, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19406224372206,87sleep00-21swapper19:06:330
198369916317,122cyclictest28781-21df_inode20:05:290
198369916310,27cyclictest25797-21apt-get23:01:340
198369916118,118cyclictest15699-21munin-run22:00:020
198369916116,119cyclictest10689-21apt-get21:31:340
198369916114,28cyclictest17521-21sshd22:06:280
198369916112,105cyclictest15847-21/usr/sbin/munin22:01:190
198369916015,103cyclictest30066-21apt-get23:26:560
198369915932,105cyclictest2974-21apt-get23:55:140
198369915918,22cyclictest7119-21apt-get00:21:220
198369915917,24cyclictest23614-21apt-get19:35:150
198369915814,120cyclictest10560-21munin-run00:40:010
198369915717,23cyclictest10075-21diskstats21:25:560
198369915716,116cyclictest5464-21apt-get00:10:250
198369915613,26cyclictest6584-21irqstats00:15:450
198369915611,123cyclictest29768-21/usr/sbin/munin20:10:490
198369915610,123cyclictest3792-21/usr/sbin/munin00:00:500
19836991559,23cyclictest30974-21apt-get20:21:510
198369915522,105cyclictest23514-21apt-get22:45:280
198369915519,25cyclictest29479-21df_inode23:20:290
198369915515,113cyclictest1163-21munin-run20:35:020
198369915514,115cyclictest22021-21/usr/sbin/munin19:26:130
198369915513,27cyclictest376-21latency_hist20:30:020
198369915512,115cyclictest26120-21apt-config19:50:190
198369915417,112cyclictest25098-21users19:41:070
198369915416,114cyclictest1328-21apt-get20:35:270
198369915416,112cyclictest3107-21/usr/sbin/munin20:45:370
198369915414,117cyclictest8379-21diskstats00:25:400
198369915410,119cyclictest27753-21modprobe20:00:020
198369915320,26cyclictest27884-21apt-get20:00:200
198369915316,113cyclictest18541-21df_inode22:15:280
198369915315,115cyclictest5260-21/usr/sbin/munin00:06:100
198369915313,115cyclictest32076-21dpkg23:35:160
198369915311,120cyclictest7738-21unixbench_singl21:11:070
198369915218,21cyclictest2825-21head23:51:080
198369915217,112cyclictest12445-21users21:36:130
198369915216,25cyclictest7808-21apt-get21:15:540
198369915216,111cyclictest30974-21apt20:20:020
198369915215,99cyclictest25802-21/usr/sbin/munin23:00:050
198369915215,115cyclictest21107-21memory22:30:440
198369915213,117cyclictest2317-21apt-get20:40:290
198369915213,115cyclictest29027-21cut23:16:000
198369915128,34cyclictest13770-21ps21:45:550
198369915118,106cyclictest9064-21apt-get00:30:200
198369915116,112cyclictest22786-21df22:40:420
198369915115,23cyclictest22361-21apt-get22:40:030
198369915115,111cyclictest12717-21df_inode21:40:280
198369915114,21cyclictest22922-21df_inode19:30:280
198369915020,22cyclictest0-21swapper19:50:010
198369915017,106cyclictest19270-21apt-get22:20:210
198369915012,26cyclictest24476-21/usr/sbin/munin22:50:380
19836991499,100cyclictest5410-21modprobe21:00:020
198369914924,108cyclictest8525-21kworker/u2:1021:20:210
198369914921,101cyclictest5525-21apt-get21:00:230
198369914917,23cyclictest27849-21df_inode23:10:300
198369914916,111cyclictest20907-21df19:15:220
198369914914,24cyclictest1282-21munin-run23:45:000
198369914911,114cyclictest18069-21wc22:10:570
198369914816,23cyclictest6493-21irqstats21:05:400
198369914813,35cyclictest1487-21sshd23:45:290
198369914812,22cyclictest21744-21sort19:21:020
198369914714,108cyclictest20313-21memory22:25:480
198369914712,26cyclictest26486-21kworker/u2:1223:05:170
198369914712,113cyclictest3900-21/usr/sbin/munin20:50:110
198369914711,111cyclictest20363-21grep19:10:590
198369914616,90cyclictest31909-21gpgv23:35:040
198369914415,24cyclictest14203-21apt-get21:50:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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