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2025-04-02 - 05:34

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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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.

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 20 highest latencies:
System rack4slot6s.osadl.org (updated Wed Apr 02, 2025 00:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1799922650,2sleep017998-21/usr/sbin/munin21:00:160
3256821550,3sleep032567-21/usr/sbin/munin22:00:230
789921280,3chrt7896-21ntpq22:35:190
2623821260,2sleep026237-21/usr/sbin/munin23:55:200
2353921010,3sleep023540-21sshd23:42:230
37192980,3sleep03718-21interrupts20:00:170
233052840,3sleep023347-21ntp_kernel_pll_21:20:210
2194727519,31sleep021982-21irqstats19:05:160
39072720,3sleep03908-21systemctl00:40:000
23042996324,15cyclictest12510-21sshd20:39:230
23042996122,12cyclictest16740-21wc23:15:010
2304299609,19cyclictest30933-21/usr/sbin/munin21:55:170
2304299608,19cyclictest27084-21df_inode19:25:140
23042996034,15cyclictest25821-21/usr/sbin/munin19:20:150
23042996012,17cyclictest22050-21ntp_states21:15:250
2304299599,18cyclictest5571-21/usr/sbin/munin20:10:220
2304299599,16cyclictest14078-21df20:45:120
2304299596,20cyclictest16588-21/usr/sbin/munin20:55:120
23042995935,15cyclictest26687-21/usr/sbin/munin21:35:260
23042995935,15cyclictest20815-21/usr/sbin/munin21:10:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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