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2026-04-08 - 14:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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 20 highest latencies:
System rack9slot4s (updated Wed Apr 08, 2026 12:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
106249912871217,65cyclictest11595-21ntp_states07:25:240
106259912671,5cyclictest11358-21iostat07:25:191
103902561517,30sleep00-21swapper/007:23:060
101912463418,31sleep10-21swapper/107:21:011
1062499147123,20cyclictest0-21swapper/011:55:280
114502950,8sleep00-21swapper/011:15:250
74262880,4sleep17424-21sh11:45:131
81702850,6sleep01062499cyclictest08:40:200
32462780,3sleep0111rcuc/012:14:380
28432780,5sleep01062499cyclictest08:25:280
228602660,4sleep041ktimersoftd/012:00:260
181942560,2sleep118190-21grep11:55:281
325912550,4sleep0111rcuc/008:20:110
276902471,28sleep127843-21awk12:05:291
10625994716,21cyclictest22-21ksoftirqd/109:17:311
37882452,4sleep00-21swapper/012:48:560
10625994317,10cyclictest22-21ksoftirqd/110:45:261
10625994315,17cyclictest22-21ksoftirqd/110:44:471
182682423,35sleep118281-21ssh09:42:061
10625994217,6cyclictest22-21ksoftirqd/111:37:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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