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2026-08-03 - 07:18

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 03, 2026 00:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8623224572208,88sleep00-21swapper19:08:200
88579916616,124cyclictest10506-21apt-get19:20:350
88579916516,123cyclictest9650-21munin-run19:15:060
8857991629,126cyclictest3400-21sed21:51:040
88579916011,41cyclictest12256-21sed22:46:020
88579915821,108cyclictest8405-21apt-get22:25:220
88579915711,121cyclictest4276-21sendmail22:00:020
88579915676,36cyclictest15927-21df_inode23:10:450
88579915640,96cyclictest21847-21proc_pri23:45:540
88579915630,23cyclictest17942-21mailstats23:20:570
88579915624,93cyclictest5554-21wc22:05:540
88579915616,40cyclictest28371-21cut00:25:580
88579915615,98cyclictest831-21apt-get21:41:380
88579915615,118cyclictest10991-21irqstats22:40:380
88579915612,25cyclictest18282-21grep20:05:550
8857991557,124cyclictest9932-21apt-config19:15:250
8857991549,121cyclictest17308-21users23:16:150
88579915414,99cyclictest5980-21apt-get22:10:120
88579915413,30cyclictest14445-21/usr/sbin/munin19:40:590
88579915412,25cyclictest25933-21/usr/sbin/munin20:55:140
88579915411,118cyclictest501-21wc21:35:550
88579915319,105cyclictest25139-21apt-get20:50:170
88579915317,112cyclictest23772-21apt00:00:010
88579915316,23cyclictest12698-21/usr/sbin/munin22:50:470
88579915310,121cyclictest29874-21grep00:35:570
88579915218,91cyclictest30666-21apt-get21:26:340
88579915217,111cyclictest17227-21df_inode20:00:300
88579915132,19cyclictest11496-21/usr/sbin/munin19:25:580
88579915129,22cyclictest19580-21switchtime23:31:040
88579915119,106cyclictest25600-21diskstats00:10:330
88579915119,104cyclictest6776-21apt-get22:15:200
88579915116,113cyclictest30668-21munin-run21:25:010
88579915115,24cyclictest27552-21apt-get21:05:200
88579915115,21cyclictest13083-21apt-get19:35:180
88579915115,112cyclictest24934-21memory00:05:450
88579915115,110cyclictest9202-21/usr/sbin/munin22:30:220
88579915112,115cyclictest18713-21sshd23:25:580
88579915111,118cyclictest32090-21tr21:30:580
8857991509,116cyclictest23795-21wc20:40:460
88579915019,27cyclictest16294-21apt-get19:55:190
88579915017,26cyclictest18710-21apt-get20:10:190
88579915016,22cyclictest4654-21sort22:00:470
88579915016,112cyclictest29397-21modprobe00:35:010
88579915012,114cyclictest22169-21memory20:30:470
88579915012,113cyclictest15521-21munin-run23:10:040
8857991499,117cyclictest246-21in:imuxsock21:13:540
8857991493,103cyclictest20071-21sort20:16:030
88579914920,26cyclictest24442-21df20:45:260
88579914917,21cyclictest0-21swapper20:25:000
88579914915,20cyclictest0-21swapper22:35:560
88579914914,23cyclictest26992-21apt00:20:000
88579914911,115cyclictest13624-21zcat22:55:590
88579914910,27cyclictest15791-21tr19:50:480
88579914833,20cyclictest12290-21apt-get19:30:150
88579914822,99cyclictest7718-21diskstats22:20:330
88579914820,25cyclictest21134-21apt-get20:25:210
88579914815,108cyclictest23907-21grep00:00:210
88579914813,20cyclictest27116-21apt-get00:20:130
88579914735,91cyclictest29541-21processes21:15:550
88579914730,22cyclictest26752-21/usr/sbin/munin21:00:530
88579914715,36cyclictest22388-21df_inode23:50:300
88579914711,24cyclictest15361-21users19:46:080
88579914612,25cyclictest20295-21wc23:35:550
88579914612,110cyclictest23068-21/usr/sbin/munin20:35:540
88579914517,45cyclictest21347-21users23:41:040
88579914312,21cyclictest14452-21rt-features23:00:560
88579914229,22cyclictest1981-21apt-get21:45:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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