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2026-05-15 - 17:55

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 Fri May 15, 2026 12:45:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17969224262181,97sleep00-21swapper07:07:120
183299915840,23cyclictest29769-21latency11:35:400
183299915817,24cyclictest7430-21munin-run12:40:020
183299915816,118cyclictest8128-21munin-run09:25:010
183299915816,117cyclictest7312-21munin-run09:20:040
183299915721,106cyclictest1921-21apt-get12:05:210
183299915713,24cyclictest4340-21/usr/sbin/munin12:20:570
183299915632,104cyclictest14539-21apt-get10:06:390
183299915614,100cyclictest22789-21munin-run10:55:010
183299915528,20cyclictest0-21swapper09:35:550
183299915517,115cyclictest26435-21df_inode11:15:280
183299915517,114cyclictest17533-21memory10:20:430
183299915515,117cyclictest4312-21df09:00:250
183299915514,115cyclictest300-21sshd08:40:170
183299915512,121cyclictest6016-21sort09:10:400
183299915511,119cyclictest26672-21modprobe08:00:010
183299915416,23cyclictest12399-21irqstats09:50:360
183299915416,20cyclictest16360-21apt10:15:010
183299915413,26cyclictest27656-21grep11:20:580
183299915412,43cyclictest22468-21cut07:30:590
183299915411,116cyclictest21877-21cron07:30:010
183299915410,120cyclictest12784-21systemd-journal09:45:010
183299915410,118cyclictest24471-21wc07:45:230
183299915321,26cyclictest14541-21munin-run10:05:040
183299915319,109cyclictest13725-21munin-run10:00:020
183299915223,101cyclictest30819-21apt-get08:25:220
183299915215,25cyclictest27599-21/usr/sbin/munin08:06:080
183299915213,25cyclictest6483-21ls12:31:010
183299915211,28cyclictest19502-21head10:31:020
183299915211,118cyclictest32305-21apt-get08:36:150
183299915114,114cyclictest5361-21wc12:25:400
183299915110,25cyclictest21719-21grep10:45:550
183299915017,95cyclictest29897-21apt08:20:020
183299915017,29cyclictest20819-21fgrep07:20:560
183299915016,111cyclictest32624-21users11:51:060
183299915015,110cyclictest26804-21/usr/sbin/munin08:00:110
183299915013,42cyclictest30370-21/usr/sbin/munin11:40:530
183299915013,115cyclictest22928-21/usr/sbin/munin10:55:110
183299915012,95cyclictest28643-21missed_timers08:10:430
183299915011,27cyclictest19230-21munin-node10:40:150
18329991499,21cyclictest30308-21ntpq08:20:470
183299914932,22cyclictest20319-21cat07:20:050
183299914919,25cyclictest2836-21memory08:50:430
183299914917,23cyclictest5113-21df09:05:280
183299914917,108cyclictest19136-21munin-node07:15:050
183299914916,22cyclictest18330-21memory10:25:430
183299914913,37cyclictest19975-21tr10:35:480
183299914814,111cyclictest24293-21munin-run07:45:010
183299914813,23cyclictest9131-21diskstats09:30:320
183299914812,22cyclictest12119-21modprobe09:50:010
183299914812,113cyclictest4221-21munin-plugin-st12:20:010
183299914730,22cyclictest32331-21gpgv08:35:050
183299914717,24cyclictest1228-21df_inode12:00:270
183299914712,24cyclictest22876-21df07:35:260
183299914710,26cyclictest20042-21snmpd11:30:560
18329991468,114cyclictest24807-21wc11:05:230
183299914624,18cyclictest28329-21ps11:25:540
183299914618,102cyclictest31269-21df11:45:240
183299914613,23cyclictest8326-21df09:25:260
183299914613,110cyclictest4087-21apt09:00:020
183299914612,106cyclictest16459-21/usr/sbin/munin10:15:350
183299914611,23cyclictest26066-21sort11:11:000
183299914521,99cyclictest32762-21apt-get11:55:200
183299914516,23cyclictest2957-21memory12:10:430
183299914514,25cyclictest2165-21/usr/sbin/munin08:45:570
183299914512,93cyclictest24226-21sshd11:00:530
183299914429,20cyclictest25700-21grep07:50:580
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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