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2025-11-08 - 19:51

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 08, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304721330,4chrt3049-21switchtime08:40:580
875821280,3chrt8760-21latency_hist11:10:010
1845021270,4chrt18448-21open_inodes07:35:250
3084421260,3chrt30845-21/usr/sbin/munin12:35:130
2477021210,3chrt24771-21ntp_states10:05:220
1609921150,3sleep016101-21timerandwakeup07:25:290
1304521100,3sleep012853-21/usr/sbin/munin09:20:190
2618721010,2sleep026189-21awk10:10:290
2313621010,3sleep023179-21if_eth012:05:160
182802880,3sleep018279-21sendmail_mailqu11:45:270
141722865,9sleep014181-21memory11:30:180
12402860,3sleep01253-21/usr/sbin/munin08:35:150
73932810,2sleep07398-21modprobe11:05:010
198922790,2sleep019893-21run-parts07:40:270
283772770,3sleep028376-21grep10:20:120
1151727722,30sleep011541-21munin-run07:10:010
98102763,5sleep00-21swapper11:13:450
117232740,5sleep011722-21memory09:15:190
68262700,3sleep06892-21timerandwakeup08:55:300
212222673,5sleep00-21swapper09:50:420
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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