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2025-11-29 - 20:03

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 Sat Nov 29, 2025 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
286522600,2sleep02867-21latency_hist07:55:010
22741214719,34sleep022743-21ntpq07:05:220
1183221450,2sleep011833-21cut10:35:020
1594421350,3chrt15889-21/usr/sbin/munin08:45:140
468521280,2sleep04686-21readlink08:00:270
570821120,3sleep05706-21ntp_states10:10:230
3150421120,3sleep031420-21/usr/sbin/munin09:45:160
2126521100,3sleep021322-21ntp_kernel_err09:05:220
2010921080,4sleep020177-21/usr/sbin/munin09:00:270
42902886,10sleep04297-21awk12:10:250
31972880,4sleep03268-21grep12:05:300
287102880,3sleep028756-21sort09:35:020
223032874,9sleep022347-21if_eth011:15:170
186552810,3sleep018660-21/usr/sbin/munin11:00:250
239962610,2sleep023997-21systemctl11:20:280
23650996124,14cyclictest16587-21sshd10:52:210
23650996016,15cyclictest30594-21proc_pri07:35:300
23650996011,18cyclictest26218-21munin-run07:20:010
2365099598,16cyclictest8965-21chrt12:29:280
23650995910,17cyclictest22421-21/usr/sbin/munin09:10:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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