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2026-04-28 - 04:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, 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 here to display the system's profile data or here to proceed to next system.
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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 50 highest latencies:
System rack2slot7s.osadl.org (updated Tue Apr 28, 2026 00:43:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3951387995944,10cyclictest261-21systemd-journal00:30:071
3951387995944,10cyclictest261-21systemd-journal00:30:071
3951388995849,6cyclictest1-21systemd21:10:012
3951388995849,6cyclictest1-21systemd21:10:012
3951387995444,6cyclictest4042514-21idleruntime-cro22:20:011
3951386995315,33cyclictest3988723-21ssh21:10:470
3951386995146,3cyclictest4150698-21grep00:35:010
3951386995146,3cyclictest4150698-21grep00:35:010
3951387995039,5cyclictest0-21swapper/120:25:431
3951387994940,6cyclictest4054439-21latency_hist22:35:021
3951388994838,4cyclictest0-21swapper/223:35:462
3951387994839,6cyclictest421-21dbus-daemon00:00:011
3951387994839,6cyclictest3972409-21systemd-run20:20:011
3951387994838,7cyclictest4142682-21true00:25:011
3951386994639,4cyclictest4062415-21systemd-run22:45:010
3951386994635,8cyclictest421-21dbus-daemon19:45:010
3951386994635,8cyclictest421-21dbus-daemon19:45:010
3951388994540,2cyclictest0-21swapper/221:15:442
3951388994538,4cyclictest4082351-21munin-plugin-st23:10:012
3951388994536,6cyclictest4050539-21latency_hist22:30:022
3951387994535,7cyclictest659-21snmpd23:30:521
3951387994535,7cyclictest659-21snmpd23:30:521
3951387994535,6cyclictest420-21avahi-daemon21:27:211
395138699454,33cyclictest4115756-21ssh23:50:440
3951387994424,4cyclictest171rcu_preempt21:35:431
3951386994435,6cyclictest1017-21sendmail-mta23:25:430
3951386994429,12cyclictest4119593-21missed_timers23:55:380
3951388994336,3cyclictest0-21swapper/222:55:462
3951388994335,5cyclictest3966382-21sendmail20:00:012
3951388994334,5cyclictest421-21dbus-daemon21:15:012
3951387994326,13cyclictest421-21dbus-daemon22:55:021
3951387994326,13cyclictest421-21dbus-daemon22:55:021
3951388994232,6cyclictest4015411-21latency_hist21:45:022
3951387994232,6cyclictest3996821-21proc_pri21:20:511
3951387994231,7cyclictest2147018-21cups-browsed21:45:311
3951387994231,7cyclictest2147018-21cups-browsed21:45:311
3951387994229,10cyclictest4043809-21awk22:20:501
3951388994132,5cyclictest0-21swapper/223:20:442
395138799412,30cyclictest4048336-21ssh22:25:581
3951386994132,7cyclictest4102419-21munin-plugin-st23:35:010
3951386994132,7cyclictest4102419-21munin-plugin-st23:35:010
3951388994033,4cyclictest3973879-21debian-sa120:25:012
3951388994032,5cyclictest4118555-21systemd-run23:55:012
3951387994033,3cyclictest0-21swapper/123:50:431
3951387994033,3cyclictest0-21swapper/121:40:341
395138799403,32cyclictest4083684-21ssh23:10:481
3951387994030,7cyclictest2147018-21cups-browsed22:45:431
3951387994010,13cyclictest28-21ksoftirqd/121:30:451
3951388993927,9cyclictest4127976-21gcc00:05:482
395138899392,30cyclictest4055719-21ssh22:35:472
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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