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2026-09-18 - 08:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 792 highest latencies:
System rack4slot6s.osadl.org (updated Fri Sep 18, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
734622570,2sleep07349-21processes23:25:240
1883022480,2sleep018833-21netstat00:10:230
1735221320,4chrt17351-21munin-run22:00:000
1921121290,3sleep019212-21/usr/sbin/munin20:00:200
1993121280,4chrt19929-21df00:15:130
1720221190,3sleep017200-21grep00:05:010
185721130,2sleep01858-21cpu23:05:110
1363121110,4sleep013670-21sendmail19:40:000
3172421100,4sleep031727-21df22:55:140
450321050,4sleep04517-21irqstats23:15:160
97852940,3sleep09800-21munin-run19:25:010
190652947,12sleep019069-21ntpq22:05:210
175762930,3sleep017630-21interrupts22:00:170
89222860,3sleep08985-21/usr/sbin/munin21:25:270
153582860,3sleep015416-21grep21:50:250
70392825,12sleep07040-21sshd19:13:490
214102824,61sleep021436-21ls22:15:150
224762777,57sleep022493-21cpu00:25:120
584227620,31sleep05867-21munin-run19:10:000
322552760,3sleep032252-21grep20:50:260
13442763,5sleep00-21swapper20:56:010
279742716,53sleep028024-21df20:35:120
113142670,2sleep011316-21tr23:40:270
589099628,19cyclictest26515-21/usr/sbin/munin22:35:290
589099617,17cyclictest15078-21/usr/sbin/munin19:45:300
5890996111,17cyclictest13571-21irqstats23:50:190
5890996110,17cyclictest8500-21munin-run19:20:000
5890996110,17cyclictest12141-21/usr/sbin/munin23:45:250
589099608,19cyclictest21526-21/usr/sbin/munin20:10:270
5890996032,18cyclictest26938-21/usr/sbin/munin20:30:190
5890996011,19cyclictest29384-21ntpq22:45:220
589099599,17cyclictest5849-21/usr/sbin/munin21:15:150
589099599,17cyclictest17523-21munin-run19:55:000
589099598,17cyclictest23255-21users22:20:290
589099598,15cyclictest13663-21df21:45:120
5890995935,15cyclictest8349-21/usr/sbin/munin23:30:160
589099589,14cyclictest17642-21/usr/sbin/munin19:55:310
589099587,16cyclictest20128-21/usr/sbin/munin22:10:140
589099579,18cyclictest3977-21sshd23:12:480
589099579,17cyclictest12391-21df_inode21:40:140
589099579,16cyclictest15879-21munin-run00:00:000
589099579,15cyclictest1038-21/usr/sbin/munin23:00:280
589099578,17cyclictest25476-21/usr/sbin/munin20:25:130
589099578,17cyclictest11460-21/usr/sbin/munin21:35:260
589099577,19cyclictest288-21snmpd19:31:410
5890995733,15cyclictest10145-21/usr/sbin/munin19:25:200
5890995732,16cyclictest2060-21/usr/sbin/munin21:00:150
5890995730,16cyclictest29474-21/usr/sbin/munin20:40:190
589099569,17cyclictest24255-21/usr/sbin/munin20:20:140
589099569,15cyclictest7175-21/usr/sbin/munin21:20:250
589099569,15cyclictest3275-21/usr/sbin/munin21:05:240
589099568,16cyclictest10286-21cat21:30:260
589099568,15cyclictest30393-21/usr/sbin/munin22:50:180
589099568,15cyclictest22807-21/usr/sbin/munin20:15:290
589099567,17cyclictest14149-21/usr/sbin/munin19:40:240
5890995632,16cyclictest25371-21/usr/sbin/munin00:35:250
5890995632,15cyclictest9827-21/usr/sbin/munin23:35:190
5890995610,15cyclictest30714-21irqstats20:45:170
5890995610,15cyclictest20389-21irqstats20:05:180
589099559,15cyclictest28113-21ntp_states22:40:240
589099558,17cyclictest4861-21ntp_states21:10:240
5890995532,15cyclictest17496-21/usr/sbin/munin00:05:180
5890995531,15cyclictest23838-21/usr/sbin/munin00:30:120
5890995531,15cyclictest21636-21/usr/sbin/munin00:20:270
5890995530,16cyclictest25312-21/usr/sbin/munin22:30:180
5890995431,14cyclictest24009-21/usr/sbin/munin22:25:110
589099536,14cyclictest5697-21/usr/sbin/munin23:20:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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