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2025-12-07 - 23:12

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 Sun Dec 07, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2968322420,2sleep029682-21/usr/sbin/munin11:20:310
2555621520,2chrt25557-21if_eth009:00:150
2395021450,3sleep023952-21latency_hist11:00:020
1015621390,4chrt10158-21switchtime12:10:260
1113521360,3chrt11133-21df_inode10:10:130
2955821340,2sleep029560-21awk09:15:190
1280921280,3chrt12810-21timerwakeupswit12:20:280
247621170,2sleep02475-21/usr/sbin/munin07:30:250
3095521100,4sleep030636-21/usr/sbin/munin09:20:280
71542980,3sleep07197-21if_eth012:00:180
118052960,3sleep011808-21/usr/sbin/munin08:05:290
281712940,3sleep028175-21ntpq11:15:240
97872907,11sleep09819-21latency_hist08:00:010
84752835,66sleep08509-21irqstats12:05:170
243722756,58sleep024437-21systemctl11:00:260
270852725,55sleep027088-21ntp_states09:05:540
2816527018,27sleep028201-21df07:05:130
19532660,2sleep01952-21/usr/sbin/munin11:40:110
29350996311,17cyclictest20133-21/usr/sbin/munin10:45:180
73282620,2sleep07327-21/usr/sbin/munin07:50:110
2935099629,19cyclictest877-21/usr/sbin/munin07:25:300
29350996223,14cyclictest15631-21runrttasks08:20:320
29350996210,19cyclictest13784-21/usr/sbin/munin08:15:160
29350996135,15cyclictest16325-21/usr/sbin/munin10:30:130
29350996011,14cyclictest19257-21ntp_states08:35:380
29350996010,19cyclictest31775-21/usr/sbin/munin11:30:330
2935099598,17cyclictest13686-21/usr/sbin/munin10:20:320
29350995933,15cyclictest6265-21/usr/sbin/munin07:45:180
29350995910,16cyclictest7191-21/usr/sbin/munin09:55:150
2935099589,16cyclictest21837-21ntp_states08:45:230
2935099589,15cyclictest15413-21/usr/sbin/munin10:25:290
2935099588,18cyclictest3194-21/usr/sbin/munin11:45:250
2935099588,17cyclictest6174-21/usr/sbin/munin11:55:260
2935099588,17cyclictest597-21/usr/sbin/munin11:35:280
2935099588,17cyclictest17542-21/usr/sbin/munin10:35:320
2935099588,16cyclictest16584-21/usr/sbin/munin08:25:230
2935099588,15cyclictest4924-21ntpq09:45:260
2935099587,19cyclictest2354-21pluginstate09:35:250
2935099587,18cyclictest30491-21/usr/sbin/munin11:25:280
29350995833,15cyclictest13932-21/usr/sbin/munin12:25:270
29350995811,17cyclictest28076-21df09:10:140
29350995811,15cyclictest9970-21df08:00:120
2935099579,16cyclictest3447-21/usr/sbin/munin07:35:180
2935099578,17cyclictest31786-21sshd07:19:110
2935099577,17cyclictest4757-21/usr/sbin/munin07:40:200
2935099577,17cyclictest12499-21/usr/sbin/munin08:10:160
29350995732,16cyclictest18531-21runrttasks08:32:330
29350995717,15cyclictest269-21runrttasks12:35:060
29350995710,17cyclictest25610-21ntp_states11:05:250
2935099569,18cyclictest20015-21idleruntime-cro10:45:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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