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2026-01-05 - 04:26

OSADL QA Farm on Real-time of Mainline Linux

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

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 100 highest latencies:
System rackeslot8s.osadl.org (updated Mon Jan 05, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13701479912490,1245cyclictest15340072sleep33
13701479912210,1217cyclictest16758162sleep33
13701479911720,1168cyclictest17467432sleep33
1370147994070,404cyclictest1565893-21turbostat3
1370147994070,404cyclictest1565893-21turbostat3
1370147992017,1cyclictest0-21swapper/33
1370147992016,1cyclictest0-21swapper/33
1370147991714,1cyclictest0-21swapper/33
137014799165,8cyclictest1520566-21taskset3
1370147991613,1cyclictest0-21swapper/33
1370147991613,1cyclictest0-21swapper/33
1370147991613,1cyclictest0-21swapper/33
137014799161,12cyclictest1618133-21taskset3
137014799161,11cyclictest1591867-21taskset3
137014799161,10cyclictest1502008-21chrt3
301798150,2rtkit-daemon0-21swapper/22
137014799155,7cyclictest17224812sleep33
1370147991512,1cyclictest0-21swapper/33
1370147991512,1cyclictest0-21swapper/33
1370147991512,1cyclictest0-21swapper/33
1370147991512,1cyclictest0-21swapper/33
137014799151,11cyclictest1456523-21taskset3
137014799151,10cyclictest1778176-21taskset3
137014799151,10cyclictest1701515-21turbostat3
137014799151,10cyclictest1611693-21taskset3
137014799151,10cyclictest1482457-21taskset3
137014799151,10cyclictest1426553-21taskset3
137014799151,10cyclictest1376515-21turbostat3
13661042151,2sleep20-21swapper/22
137014799146,6cyclictest1553060-21sleep3
137014799144,7cyclictest1437640-21taskset3
1370147991413,0cyclictest0-21swapper/33
1370147991412,1cyclictest0-21swapper/33
1370147991412,1cyclictest0-21swapper/33
1370147991412,1cyclictest0-21swapper/33
1370147991412,1cyclictest0-21swapper/33
1370147991412,0cyclictest0-21swapper/33
1370147991412,0cyclictest0-21swapper/33
1370147991412,0cyclictest0-21swapper/33
1370147991411,1cyclictest0-21swapper/33
1370147991411,1cyclictest0-21swapper/33
1370147991411,1cyclictest0-21swapper/33
137014799141,10cyclictest1785538-21taskset3
137014799141,10cyclictest1732923-21taskset3
137014799141,10cyclictest1707897-21taskset3
137014799141,10cyclictest1547245-21taskset3
137014799141,10cyclictest1475808-21taskset3
137014799140,11cyclictest1798127-21turbostat3
301798130,8rtkit-daemon1792155-21awk1
137014799132,8cyclictest1598557-21taskset3
137014799131,9cyclictest1650487-21taskset3
137014799131,9cyclictest1649878-21taskset3
1370147991312,0cyclictest0-21swapper/33
1370147991312,0cyclictest0-21swapper/33
137014799131,10cyclictest1676077-21taskset3
137014799131,10cyclictest1585195-21taskset3
137014799131,10cyclictest1475281-21taskset3
1370147991311,0cyclictest0-21swapper/33
1370147991311,0cyclictest0-21swapper/33
1370147991311,0cyclictest0-21swapper/33
1370147991310,1cyclictest0-21swapper/33
137014799130,9cyclictest17660452sleep33
137014799130,10cyclictest1710519-21taskset3
137014799130,10cyclictest1630311-21chrt3
137014799130,10cyclictest1578503-21taskset3
137014799130,10cyclictest1404495-21taskset3
14394032120,3sleep11441470-21cut1
14297652125,5sleep01429875-21grep0
137014799123,7cyclictest1443608-21taskset3
137014799122,7cyclictest1436071-21taskset3
137014799121,8cyclictest1740343-21taskset3
137014799120,9cyclictest1739703-21chrt3
137014799120,9cyclictest1682505-21taskset3
301798110,6rtkit-daemon1566320-21df2
301798110,6rtkit-daemon1566320-21df2
301798110,5rtkit-daemon1758682-21python31
301798110,5rtkit-daemon1758682-21python31
301798110,3rtkit-daemon636-21snmpd2
301798110,3rtkit-daemon1376706-21munin-node2
16634602110,8sleep01663573-21perl0
16323722111,8sleep20-21swapper/22
16266282111,8sleep00-21swapper/00
13639612111,6sleep11364107-21df1
301798100,6rtkit-daemon636-21snmpd2
301798100,6rtkit-daemon448-21wpa_supplicant1
301798100,5rtkit-daemon1688947-21apt-get1
301798100,5rtkit-daemon1663045-21munin-run1
301798100,5rtkit-daemon1502154-21df2
301798100,5rtkit-daemon1456677-21df_inode2
301798100,5rtkit-daemon1416553-21sed2
301798100,5rtkit-daemon1385937-21df_inode2
301798100,3rtkit-daemon1376706-21munin-node1
301798100,1rtkit-daemon0-21swapper/22
17079012101,6sleep21-21systemd2
16760902101,5sleep01676112-21apt-get0
15650552101,5sleep11565171-21python31
15500702100,1sleep20-21swapper/22
15408652101,6sleep11541385-21sed1
14877232101,5sleep01487781-21ntp_states0
13693202101,5sleep01369554-21grep0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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