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2026-04-09 - 11:15

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 50 highest latencies:
System rack9slot4s (updated Thu Apr 09, 2026 00:59:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
319249911661139,23cyclictest32404-21fschecks_count19:25:161
319239911351102,19cyclictest0-21swapper/019:25:160
318112661617,29sleep10-21swapper/119:24:261
301502514417,29sleep00-21swapper/019:20:070
128442860,8sleep03192399cyclictest21:48:370
158232800,4sleep0111rcuc/022:25:140
40322780,4sleep0111rcuc/022:45:340
182652580,7sleep03192399cyclictest00:07:550
3192499483,11cyclictest17839-21latency23:00:231
160162460,8sleep03192399cyclictest20:05:200
96552450,8sleep13192499cyclictest00:32:141
3192499447,5cyclictest3762-21ssh21:39:281
3192499446,12cyclictest0-21swapper/123:07:541
31924994410,5cyclictest40550irq/92-i91522:50:181
3192499437,5cyclictest5770-21ssh00:28:371
3192499437,5cyclictest27516-21ssh22:36:461
3192499437,5cyclictest13802-21ssh22:22:521
3192499437,5cyclictest13394-21ssh21:49:241
3192499437,5cyclictest11773-21ssh23:27:351
3192499432,9cyclictest0-21swapper/120:15:011
3192499431,9cyclictest0-21swapper/121:34:141
3192499431,9cyclictest0-21swapper/100:15:291
3192499431,19cyclictest12958-21/usr/sbin/munin22:55:271
3192499426,6cyclictest20449-21ssh00:43:571
3192499422,9cyclictest0-21swapper/123:57:161
3192499422,9cyclictest0-21swapper/122:16:051
3192499422,8cyclictest0-21swapper/120:10:221
3192499421,9cyclictest0-21swapper/122:02:151
3192499421,9cyclictest0-21swapper/121:10:221
3192499421,16cyclictest0-21swapper/120:01:351
3192499420,11cyclictest138250irq/90-eth023:46:401
3192499417,5cyclictest22508-21ssh00:45:271
3192499415,6cyclictest22-21ksoftirqd/119:51:471
3192499412,16cyclictest0-21swapper/100:05:011
3192499411,8cyclictest0-21swapper/121:50:131
3192499411,8cyclictest0-21swapper/121:20:211
3192499411,8cyclictest0-21swapper/120:25:201
3192499411,8cyclictest0-21swapper/100:35:411
3192499408,6cyclictest22-21ksoftirqd/121:19:391
3192499407,6cyclictest22-21ksoftirqd/100:12:161
3192499407,5cyclictest6980-21ssh21:42:061
3192499402,9cyclictest0-21swapper/123:35:551
3192499402,9cyclictest0-21swapper/100:53:211
3192499401,9cyclictest0-21swapper/123:51:181
3192499401,9cyclictest0-21swapper/122:44:421
3192499401,8cyclictest0-21swapper/122:26:131
3192499401,8cyclictest0-21swapper/120:55:211
3192499401,8cyclictest0-21swapper/100:00:461
3192499401,17cyclictest0-21swapper/123:17:001
3192399407,5cyclictest0-21swapper/022:35:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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