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2026-07-14 - 00:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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 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 rack7slot7s.osadl.org (updated Mon Jul 13, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3199029644,47sleep00-21swapper/007:05:250
32028958,25sleep30-21swapper/307:08:323
3183428460,19sleep20-21swapper/207:05:222
3269827958,6sleep10-21swapper/107:07:221
27392660,0sleep10-21swapper/110:32:101
292822640,1sleep10-21swapper/110:48:001
56199284,1cyclictest25521-21diskmemload10:38:263
56199280,2cyclictest9835-21turbostat09:20:003
56199280,26cyclictest0-21swapper/309:40:283
266122270,0sleep00-21swapper/011:44:580
56199262,1cyclictest25521-21diskmemload12:35:063
64842250,0sleep00-21swapper/011:13:080
56199256,18cyclictest25521-21diskmemload12:05:253
56199254,1cyclictest25521-21diskmemload10:41:273
56199251,2cyclictest25521-21diskmemload10:33:183
56199250,2cyclictest21343-21/usr/sbin/munin10:05:243
56199244,3cyclictest25521-21diskmemload09:27:313
56199241,18cyclictest0-21swapper/312:20:183
56199240,3cyclictest0-21swapper/311:37:543
559992420,3cyclictest55750irq/128-enp2s0-10:03:112
548992422,1cyclictest1162-21cpu11:10:111
56199232,1cyclictest25521-21diskmemload09:50:373
561992312,9cyclictest0-21swapper/312:30:253
56199230,5cyclictest0-21swapper/311:50:163
559992320,3cyclictest55550irq/126-enp2s0-09:52:242
559992320,2cyclictest55850irq/129-enp2s0-11:01:222
559992320,2cyclictest55850irq/129-enp2s0-10:53:422
559992320,2cyclictest55750irq/128-enp2s0-09:27:002
559992319,3cyclictest55850irq/129-enp2s0-09:23:262
559992319,3cyclictest55650irq/127-enp2s0-11:16:562
55999231,1cyclictest25077-21apt-get11:05:132
548992320,1cyclictest0-21swapper/108:55:271
548992319,3cyclictest55750irq/128-enp2s0-12:07:421
54899231,20cyclictest0-21swapper/107:55:141
56199223,2cyclictest28965-21switchtime11:45:273
561992220,2cyclictest55750irq/128-enp2s0-10:17:373
561992220,1cyclictest55550irq/126-enp2s0-11:12:323
561992219,2cyclictest55650irq/127-enp2s0-09:33:203
56199221,4cyclictest25521-21diskmemload10:55:283
559992221,1cyclictest0-21swapper/211:14:562
559992219,2cyclictest55850irq/129-enp2s0-10:45:182
559992219,2cyclictest55750irq/128-enp2s0-11:36:052
559992219,2cyclictest55750irq/128-enp2s0-10:57:522
559992219,2cyclictest55650irq/127-enp2s0-10:44:312
559992219,2cyclictest55550irq/126-enp2s0-09:15:482
559992218,3cyclictest55850irq/129-enp2s0-10:37:502
559992218,3cyclictest55850irq/129-enp2s0-09:44:232
559992218,2cyclictest55750irq/128-enp2s0-09:58:092
55999220,22cyclictest0-21swapper/212:07:542
55999220,22cyclictest0-21swapper/209:49:442
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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