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2026-05-09 - 00:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot6s.osadl.org (updated Fri May 08, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
625023120,3sleep06251-21uname09:00:230
2900021700,4sleep028998-21grep10:30:000
2577221430,2sleep025774-21timerwakeupswit10:15:260
206621250,2sleep02065-21fw_packets08:45:140
1926921060,4sleep019338-21/usr/sbin/munin09:50:260
1522021010,4sleep015072-21/usr/sbin/munin07:30:170
70352990,3sleep07066-21/usr/sbin/munin11:10:140
99632934,9sleep09902-21/usr/sbin/munin07:10:120
239702910,3sleep023969-21wc12:15:180
174872905,10sleep017537-21df09:45:110
166072890,3sleep016671-21mailstats09:40:250
214982874,9sleep021499-21sshd07:55:050
252182805,62sleep025259-21memory12:20:160
164432807,61sleep016507-21switchtime11:45:280
277092795,60sleep027747-21if_eth012:30:140
975527720,34sleep09779-21munin-run07:10:000
187012745,58sleep018727-21irqstats11:55:150
245272694,54sleep024529-21users10:10:280
980899619,16cyclictest10983-21if_eth011:25:150
980899609,18cyclictest22873-21df08:00:100
9808996035,17cyclictest28051-21/usr/sbin/munin08:20:110
9808996012,16cyclictest8888-21sshd11:15:420
9808996010,17cyclictest31502-21sshd08:33:140
9808995935,15cyclictest31945-21/usr/sbin/munin10:40:180
9808995934,15cyclictest9815-21/usr/sbin/munin09:15:150
9808995911,16cyclictest20149-21/usr/sbin/munin12:00:210
35612593,5sleep00-21swapper08:50:230
980899589,17cyclictest29282-21/usr/sbin/munin08:25:190
980899589,17cyclictest22822-21/usr/sbin/munin12:10:230
980899589,16cyclictest288-21snmpd08:05:140
980899588,17cyclictest4286-21modprobe11:00:010
980899588,16cyclictest18948-21/usr/sbin/munin07:45:190
9808995834,15cyclictest14383-21/usr/sbin/munin07:25:280
9808995811,16cyclictest12371-21munin-run07:20:000
980899579,16cyclictest17527-21munin-run07:40:000
980899579,15cyclictest20052-21/usr/sbin/munin09:55:190
980899578,18cyclictest26828-21/usr/sbin/munin08:15:160
980899578,17cyclictest11049-21/usr/sbin/munin09:20:210
980899578,16cyclictest9649-21/usr/sbin/munin11:20:140
980899578,16cyclictest28917-21/usr/sbin/munin12:35:180
980899578,15cyclictest5689-21/usr/sbin/munin11:05:180
980899577,17cyclictest1803-21/usr/sbin/munin10:50:280
980899577,17cyclictest17665-21/usr/sbin/munin07:40:190
9808995733,16cyclictest1720-21runrttasks08:43:560
9808995733,15cyclictest32331-21/usr/sbin/munin08:35:260
9808995731,15cyclictest22738-21/usr/sbin/munin10:05:140
9808995711,15cyclictest288-21snmpd11:39:470
9808995710,15cyclictest307-21munin-node12:05:100
980899568,15cyclictest7147-21/usr/sbin/munin09:05:140
9808995633,15cyclictest15704-21runrttasks09:37:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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