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2025-12-09 - 09:16

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 Tue Dec 09, 2025 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6981224312192,95sleep00-21swapper19:09:340
70729916625,21cyclictest18017-21latency_hist23:30:080
70729916418,120cyclictest25789-21munin-run21:00:060
70729916018,24cyclictest22343-21munin-run20:40:020
70729915917,26cyclictest29236-21apt21:20:020
70729915715,118cyclictest6659-21munin-run22:20:010
70729915617,116cyclictest20943-21df20:30:270
70729915617,113cyclictest23993-21apt-get00:05:580
70729915521,110cyclictest11094-21grep22:45:490
70729915518,115cyclictest17925-21apt-get23:30:390
70729915517,116cyclictest1606-21munin-run21:50:010
70729915516,38cyclictest14075-21munin-run19:50:060
70729915516,25cyclictest20088-21apt-get23:40:140
70729915417,106cyclictest1706-21apt-get21:50:190
70729915416,115cyclictest25785-21apt-get21:00:370
7072991529,25cyclictest22338-21apt-get20:41:500
70729915218,25cyclictest24185-21munin-run20:50:010
70729915218,105cyclictest25915-21apt-get00:15:190
70729915216,22cyclictest19689-21apt-get23:37:040
70729915216,112cyclictest14073-21apt-get19:51:140
70729915215,114cyclictest30261-21df_inode21:25:280
70729915138,90cyclictest16755-21/usr/sbin/munin23:20:520
70729915118,23cyclictest12286-21munin-run22:55:010
70729915114,29cyclictest12842-21/usr/sbin/munin19:40:470
70729915114,113cyclictest29839-21munin-run00:40:010
70729915111,26cyclictest21393-21sort23:45:590
70729915110,119cyclictest31571-21sed21:31:040
70729915110,119cyclictest13381-21irqstats23:00:380
70729915018,107cyclictest15046-21memory23:10:430
70729915017,93cyclictest26853-21df_inode00:20:280
70729915016,24cyclictest7437-21users22:21:060
70729915015,21cyclictest14110-21df23:05:280
70729915013,25cyclictest15615-21awk19:56:030
70729915012,114cyclictest11587-21grep19:32:050
70729915011,23cyclictest9170-21/usr/sbin/munin22:36:090
70729915010,26cyclictest7859-21modprobe19:15:010
7072991499,116cyclictest19471-21wc20:20:420
7072991497,121cyclictest25394-21awk00:10:550
70729914920,104cyclictest31748-21apt-get21:35:200
70729914914,109cyclictest2499-21/usr/sbin/munin21:55:350
70729914913,111cyclictest20143-21df20:25:260
70729914912,114cyclictest3382-21apt-get22:00:250
70729914911,113cyclictest10629-21latency_hist19:30:010
70729914833,92cyclictest22579-21df_inode23:55:290
70729914820,21cyclictest8374-21apt-get22:30:200
70729914818,26cyclictest27547-21apt-get00:25:180
70729914817,104cyclictest16822-21apt-get20:05:200
70729914817,104cyclictest12386-21apt-get22:55:200
70729914813,49cyclictest21855-21grep23:50:420
70729914813,111cyclictest23469-21/usr/sbin/munin00:00:380
70729914812,28cyclictest11969-21latency19:35:480
70729914810,97cyclictest27079-21if_eth021:05:450
70729914810,24cyclictest10360-21ps22:40:540
7072991477,119cyclictest18830-21grep20:15:560
70729914720,27cyclictest9249-21diskstats19:20:330
70729914615,22cyclictest24380-21df20:50:250
70729914612,111cyclictest28305-21grep21:11:070
70729914611,22cyclictest30053-21latency_hist21:25:010
70729914610,23cyclictest4964-21grep22:06:090
70729914530,24cyclictest0-21swapper22:10:390
70729914516,24cyclictest9020-21munin-run19:20:030
70729914515,23cyclictest17727-21diskstats20:10:330
70729914514,110cyclictest15886-21grep23:15:490
70729914510,25cyclictest28524-21uname00:30:420
70729914417,24cyclictest7578-21apt-get22:25:140
70729914414,25cyclictest16027-21apt-get20:00:140
70729914318,23cyclictest32748-21irqstats21:40:400
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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