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2026-05-14 - 23:46

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 Thu May 14, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2198224402198,100sleep00-21swapper07:06:360
26249916913,128cyclictest22993-21/usr/sbin/munin09:10:540
26249916512,128cyclictest24386-21sort09:16:010
26249916331,95cyclictest12784-21systemd-journal09:55:010
26249916118,121cyclictest2270-21apt-get10:20:180
26249915911,124cyclictest25263-21awk09:21:420
26249915817,100cyclictest11782-21apt11:20:020
26249915815,24cyclictest13617-21apt-get08:16:400
26249915713,119cyclictest16748-21apt11:50:120
26249915613,101cyclictest15295-21grep08:21:380
26249915516,117cyclictest27944-21munin-run09:40:040
26249915421,106cyclictest32239-21irqstats10:05:350
26249915416,39cyclictest2150-21munin-run10:20:030
26249915414,25cyclictest16149-21memory11:45:410
26249915413,117cyclictest8722-21apt-get07:45:230
26249915312,24cyclictest7309-21memory10:50:440
26249915311,26cyclictest10412-21munin-run07:55:020
26249915311,120cyclictest14376-1kworker/u3:508:25:160
26249915310,119cyclictest11135-21grep07:56:030
26249915224,22cyclictest0-21swapper11:35:390
26249915216,26cyclictest19517-21irqstats12:05:380
26249915215,24cyclictest8567-21munin-run11:00:020
26249915212,114cyclictest19225-21sshd12:02:540
26249915118,27cyclictest5651-21irqstats10:40:370
26249915117,25cyclictest19788-21apt-get08:50:160
26249915114,25cyclictest3433-21munin-node07:15:080
26249915114,23cyclictest31154-21munin-run10:00:020
26249915114,112cyclictest8402-21/usr/sbin/munin07:40:580
26249915112,115cyclictest6908-21grep07:31:020
26249915111,26cyclictest24514-21sshd12:35:530
26249915026,19cyclictest18078-21munin-run08:40:030
26249915021,103cyclictest18306-21diskstats08:40:320
26249915021,101cyclictest22674-21diskstats12:25:320
26249915018,108cyclictest28761-21munin-run09:45:010
26249915012,25cyclictest22584-21processes09:05:540
26249915011,28cyclictest13479-21wc11:30:050
26249914938,22cyclictest9057-21/usr/sbin/munin11:00:540
26249914928,102cyclictest6275-21apt-get10:45:130
26249914919,29cyclictest21769-21apt-get12:20:200
26249914918,25cyclictest4657-21apt-get10:35:210
26249914915,24cyclictest20315-21irqstats12:10:390
26249914915,20cyclictest11907-21apt-get11:20:170
26249914914,108cyclictest12810-21cron08:10:010
26249914913,26cyclictest11458-21fw_packets08:00:350
26249914913,111cyclictest4233-21processes10:30:540
26249914913,108cyclictest20935-21/usr/sbin/munin12:15:450
26249914912,114cyclictest4513-21awk07:16:210
26249914911,39cyclictest10289-21wc11:10:190
26249914910,25cyclictest21283-21munin-plugin-st09:00:010
26249914910,113cyclictest15553-21awk11:40:560
26249914829,97cyclictest0-21swapper08:10:220
26249914825,101cyclictest17732-21apt-get11:55:180
26249914820,27cyclictest31274-21apt-get10:00:200
26249914817,105cyclictest23358-21apt-get12:30:140
26249914812,37cyclictest10177-21munin-plugin-st11:10:000
26249914811,111cyclictest1102-21latency_hist10:15:060
26249914715,46cyclictest17254-21sshd08:33:540
26249914714,94cyclictest7700-21head07:36:020
26249914711,110cyclictest21611-21cat09:00:420
26249914710,97cyclictest19584-21grep08:46:010
26249914611,96cyclictest29450-21cat09:46:020
26249914514,35cyclictest25929-21awk09:25:540
26249914511,27cyclictest14182-21modprobe11:35:010
26249914414,26cyclictest26549-21df_inode09:30:280
26249914316,101cyclictest5584-21df07:25:260
26249914315,104cyclictest4689-21apt-get07:20:190
26249914314,24cyclictest3528-21munin-node10:25:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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