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2026-04-22 - 02:46

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 Wed Apr 22, 2026 00:43:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
478961998669,11cyclictest659789-21ssh00:10:450
478963998475,3cyclictest0-21swapper/200:11:032
478962996550,12cyclictest659806-21ssh00:10:461
478963996147,9cyclictest420-21avahi-daemon22:50:402
478963995742,10cyclictest2852470-21cups-browsed21:30:402
478963995742,10cyclictest2852470-21cups-browsed21:30:402
478963995138,9cyclictest587026-21sendmail22:40:012
478961995120,26cyclictest0-21swapper/023:45:410
478962995025,22cyclictest501467-21cron20:25:001
478963994938,7cyclictest619603-21df_inode23:20:342
478961994938,7cyclictest151ktimers/021:25:440
478961994917,29cyclictest682258-21idleruntime-cro00:40:000
478963994836,9cyclictest0-21swapper/222:40:342
478962994838,7cyclictest571999-21/usr/sbin/munin22:20:351
478961994835,10cyclictest0-21swapper/021:20:010
47896299477,33cyclictest0-21swapper/121:43:351
478961994740,4cyclictest650584-21cron00:00:000
478961994738,6cyclictest551248-21systemd21:55:020
47896399463,34cyclictest592237-21ssh22:45:412
47896299464,34cyclictest627965-21ssh23:30:391
47896299462,38cyclictest560507-21ssh22:05:471
47896299462,16cyclictest651872-21ntpq00:00:431
478961994614,29cyclictest524877-21unixbench_singl21:20:540
478963994535,6cyclictest531021-21cron21:30:012
478963994534,7cyclictest2852470-21cups-browsed23:52:202
478963994534,7cyclictest2852470-21cups-browsed23:52:202
478963994433,7cyclictest420-21avahi-daemon22:59:172
47896299442,7cyclictest488890-21ntpq19:40:421
478961994424,17cyclictest479099-21latency_hist19:10:020
478963994336,4cyclictest571161-21sendmail22:20:012
478963994336,4cyclictest571161-21sendmail22:20:012
478962994333,7cyclictest623632-21gltestperf23:25:341
47896299432,6cyclictest484366-21ntpq19:25:401
47896299432,14cyclictest532198-21ntpq21:30:391
47896299432,14cyclictest532198-21ntpq21:30:391
478962994319,18cyclictest0-21swapper/123:55:021
478962994319,18cyclictest0-21swapper/123:55:021
478961994335,5cyclictest1-21systemd22:35:010
478961994314,9cyclictest421-21dbus-daemon23:30:290
478963994233,4cyclictest0-21swapper/223:35:482
478962994234,5cyclictest650556-40logrotate00:00:001
478962994234,5cyclictest614874-21cron23:15:001
47896299422,6cyclictest509901-21ntpq20:50:431
47896299422,6cyclictest493352-21ntpq19:55:441
47896299422,14cyclictest655856-21ntpq00:05:441
478962994221,18cyclictest0-21swapper/100:30:351
47896299421,9cyclictest506927-21ntpq20:40:431
47896299421,4cyclictest616057-21ntpq23:15:431
47896299421,11cyclictest664787-21ssh00:16:501
478961994230,5cyclictest151ktimers/019:20:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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