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2026-05-21 - 19:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 100 highest latencies:
System rack3slot3s.osadl.org (updated Thu May 21, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2117777214082,54sleep30-21swapper/33
211306129461,9sleep00-21swapper/00
211795029170,12sleep20-21swapper/22
211789129062,11sleep10-21swapper/11
21950452310,4sleep20-21swapper/22
211817999245,14cyclictest0-21swapper/33
211817999232,16cyclictest21237052sleep33
2118179992318,2cyclictest0-21swapper/33
2118179992318,2cyclictest0-21swapper/33
211817999222,14cyclictest2250057-21turbostat3
2118179992219,1cyclictest0-21swapper/33
211817999220,18cyclictest66950irq/132-enp1s0-TxRx-33
25139752211,3sleep10-21swapper/11
25061252210,2sleep30-21swapper/33
25058482211,11sleep12505862-21ssh1
211817999215,13cyclictest0-21swapper/33
2118179992119,1cyclictest0-21swapper/33
211817999211,7cyclictest2381386-21taskset3
2118179992116,2cyclictest0-21swapper/33
2118179992112,6cyclictest2152107-21taskset3
211817999211,16cyclictest66950irq/132-enp1s0-TxRx-33
211817999211,16cyclictest66950irq/132-enp1s0-TxRx-33
23915272201,3sleep00-21swapper/00
211817999206,11cyclictest0-21swapper/33
211817999204,13cyclictest0-21swapper/33
211817999204,13cyclictest0-21swapper/33
211817999203,14cyclictest0-21swapper/33
2118179992018,1cyclictest0-21swapper/33
2118179992017,1cyclictest0-21swapper/33
2118179992016,2cyclictest0-21swapper/33
2118179992016,2cyclictest0-21swapper/33
2118179992016,1cyclictest0-21swapper/33
2118179992015,2cyclictest0-21swapper/33
211817999201,15cyclictest66950irq/132-enp1s0-TxRx-33
211817999201,15cyclictest0-21swapper/33
211817999201,14cyclictest0-21swapper/33
2118179991916,1cyclictest0-21swapper/33
2118179991915,2cyclictest0-21swapper/33
2118179991915,2cyclictest0-21swapper/33
2118179991915,2cyclictest0-21swapper/33
2118179991915,2cyclictest0-21swapper/33
2118179991914,2cyclictest0-21swapper/33
2118179991912,4cyclictest2523645-21turbostat3
2118179991911,4cyclictest0-21swapper/33
211817999191,14cyclictest0-21swapper/33
211817999191,14cyclictest0-21swapper/33
23013012181,8sleep02301315-21ssh0
22280962181,13sleep22228127-21perf2
2118179991816,1cyclictest0-21swapper/33
211817999181,5cyclictest0-21swapper/33
2118179991815,2cyclictest0-21swapper/33
2118179991815,1cyclictest0-21swapper/33
2118179991815,1cyclictest0-21swapper/33
2118179991815,1cyclictest0-21swapper/33
2118179991815,1cyclictest0-21swapper/33
2118179991815,1cyclictest0-21swapper/33
2118179991815,1cyclictest0-21swapper/33
2118179991814,2cyclictest0-21swapper/33
2118179991814,2cyclictest0-21swapper/33
2118179991814,2cyclictest0-21swapper/33
211817999181,14cyclictest0-21swapper/33
211817999181,14cyclictest0-21swapper/33
211817999181,14cyclictest0-21swapper/33
26113082171,3sleep00-21swapper/00
24718032171,5sleep12471910-21cut1
2118179991714,2cyclictest0-21swapper/33
2118179991714,2cyclictest0-21swapper/33
211817999171,13cyclictest0-21swapper/33
211817999170,14cyclictest0-21swapper/33
211817999170,14cyclictest0-21swapper/33
25331162161,10sleep12533343-21df_inode1
24576132161,4sleep02457676-21ntpq0
24134592162,10sleep22413597-21/usr/sbin/munin2
23879152161,4sleep12250051-21diskmemload1
2118179991614,1cyclictest0-21swapper/33
211817999161,3cyclictest0-21swapper/33
2118179991611,3cyclictest21956952sleep33
211817999161,12cyclictest0-21swapper/33
211817999160,13cyclictest0-21swapper/33
211817999160,13cyclictest0-21swapper/33
25745232150,1sleep00-21swapper/00
25669022150,1sleep00-21swapper/00
25582572151,4sleep10-21swapper/11
24949022151,2sleep00-21swapper/00
24437692157,1sleep2171rcu_preempt2
24261262154,2sleep2171rcu_preempt2
23976872150,1sleep10-21swapper/11
23445112151,10sleep02344525-21ssh0
22686802151,8sleep12268796-21perl1
22682782151,4sleep02268292-21ssh0
21569202151,10sleep12152168-31find1
21265722152,8sleep22128249-21tr2
211817999157,5cyclictest21310742sleep33
2118179991511,3cyclictest0-21swapper/33
211817999151,11cyclictest0-21swapper/33
26032252140,3sleep20-21swapper/22
25027202141,8sleep22250051-21diskmemload2
24854292141,9sleep02485440-21ssh0
24695202141,4sleep12250051-21diskmemload1
24517962142,7sleep02250051-21diskmemload0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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