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2026-05-29 - 20:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 rack8slot4s.osadl.org (updated Fri May 29, 2026 12:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6181612274192,24sleep50-21swapper/507:09:505
6181612274192,24sleep50-21swapper/507:09:505
6178852229192,25sleep10-21swapper/107:05:511
6178852229192,25sleep10-21swapper/107:05:511
6179782227166,19sleep00-21swapper/007:07:120
6179782227166,19sleep00-21swapper/007:07:120
6181672225186,26sleep20-21swapper/207:09:552
6181672225186,26sleep20-21swapper/207:09:552
6180502225187,25sleep70-21swapper/707:08:167
6180502225187,25sleep70-21swapper/707:08:167
6179732225174,19sleep40-21swapper/407:07:074
6179732225174,19sleep40-21swapper/407:07:074
6180672224187,24sleep60-21swapper/607:08:306
6180672224187,24sleep60-21swapper/607:08:306
6179522219190,19sleep30-21swapper/307:06:503
6179522219190,19sleep30-21swapper/307:06:503
61839599260,24cyclictest648037-21munin-plugin-st08:25:004
61838499260,25cyclictest628295-21ntpq07:30:180
618404992523,1cyclictest0-21swapper/609:25:126
61840099250,24cyclictest637609-21sh08:00:005
61839599250,24cyclictest621413-21latency_hist07:15:004
61839599250,24cyclictest621413-21latency_hist07:15:004
61839199250,4cyclictest661784-21taskset08:55:123
61839199250,24cyclictest0-21swapper/307:20:143
61838999250,24cyclictest0-21swapper/208:35:112
61838999250,1cyclictest657193-21ntpq08:45:142
61838699250,24cyclictest741151-21latency_hist11:10:001
61838499250,4cyclictest643517-21turbostat08:10:000
618406992423,1cyclictest762538-21ntpq11:40:177
618406992423,1cyclictest759614-21sh11:35:187
618406992423,1cyclictest676085-21grep09:20:007
618404992423,1cyclictest0-21swapper/611:15:116
61840499240,1cyclictest650972-21cron08:30:016
61840099240,23cyclictest775962-21apt-get12:05:125
61840099240,23cyclictest682024-21ls09:30:005
618395992417,7cyclictest0-21swapper/411:12:184
618395992417,7cyclictest0-21swapper/411:12:184
618391992423,1cyclictest0-21swapper/311:12:183
618391992423,1cyclictest0-21swapper/311:12:183
618391992422,1cyclictest0-21swapper/312:39:343
61839199240,23cyclictest0-21swapper/309:25:113
618386992420,4cyclictest664320-21awk09:00:001
61838699240,24cyclictest795331-21grep12:35:171
61838499240,23cyclictest784844-21apt-get12:20:110
61840699230,22cyclictest685397-21apt-get09:35:117
61840699230,22cyclictest634343-21apt-get07:50:087
61840699230,0cyclictest790820-21apt-get12:30:147
618404992321,1cyclictest717551-21cron10:30:006
618404992321,1cyclictest633165-21munin-run07:45:006
618404992321,1cyclictest0-21swapper/612:25:006
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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