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2025-11-24 - 21:27

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 highest latencies:
System rack4slot6s.osadl.org (updated Mon Nov 24, 2025 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
818122740,2sleep08182-21grep07:40:260
124521640,5sleep01243-21cat07:15:020
1578021440,4chrt15775-21ntp_states08:10:210
412521390,3chrt4124-21/usr/sbin/munin07:25:210
1990221250,4chrt19903-21/usr/sbin/munin08:25:280
323419912433,15cyclictest14670-21/usr/sbin/munin10:10:310
323419912432,15cyclictest10191-21/usr/sbin/munin12:00:130
323419912234,16cyclictest32716-21runrttasks09:15:260
323419912231,14cyclictest6921-21/usr/sbin/munin09:40:290
323419912226,15cyclictest6839-21/usr/sbin/munin07:35:260
323419912133,13cyclictest11971-21/usr/sbin/munin10:00:280
407721190,2sleep04076-21switchtime11:35:280
323419911725,15cyclictest18214-21/usr/sbin/munin12:30:250
323419911629,15cyclictest8881-21if_eth011:55:160
323419911426,15cyclictest20282-21awk12:40:000
323419911422,16cyclictest14126-21latency_hist08:05:020
32341991139,11cyclictest13386-21users10:05:310
323419911327,14cyclictest13860-21latency_hist12:15:010
323419911210,29cyclictest10186-21/usr/sbin/munin09:55:200
32341991119,19cyclictest29563-21latency_hist11:10:020
32341991119,15cyclictest19732-21swap10:30:290
323419911127,14cyclictest8265-21seq11:52:010
323419911127,12cyclictest381-21seq11:20:470
323419911110,16cyclictest32057-21munin-run11:20:020
32341991108,17cyclictest25833-21/usr/sbin/munin08:50:250
32341991107,13cyclictest30022-21ntp_states09:05:250
323419911024,16cyclictest15197-21seq08:08:400
323419911012,19cyclictest1360-21memory09:20:200
323419911010,28cyclictest22189-21snmpd12:05:240
32341991099,13cyclictest13925-21/usr/sbin/munin12:15:310
32341991089,17cyclictest24704-21ntp_states10:50:210
32341991088,15cyclictest25776-21date08:50:020
32341991087,31cyclictest22006-21cat10:40:190
323419910812,20cyclictest2506-21df09:25:130
323419910811,19cyclictest2885-21ntpq07:20:220
32341991078,13cyclictest8902-21/usr/sbin/munin09:50:200
323419910726,14cyclictest6220-21runrttasks07:34:180
32341991069,14cyclictest6380-21memory11:45:200
32341991068,17cyclictest4223-21grep09:30:260
32341991067,15cyclictest22550-21users08:35:300
32341991059,15cyclictest30219-21sendmail-mta11:10:400
32341991057,15cyclictest18803-21chrt10:27:220
32341991057,15cyclictest15596-21ps12:20:260
323419910510,17cyclictest27264-21irqstats08:55:160
32341991049,14cyclictest9998-21seq07:48:260
32341991049,14cyclictest11754-21wc07:55:170
32341991048,14cyclictest10449-21/usr/sbin/munin07:50:150
32341991039,16cyclictest21741-21sshd08:34:200
32341991036,16cyclictest6215-21sendmail-msp09:40:000
32341991029,14cyclictest24473-21cat08:45:010
32341991029,14cyclictest1026-21/usr/sbin/munin11:25:150
32341991028,14cyclictest3534-21latency_hist11:35:020
32341991028,14cyclictest269-21runrttasks12:25:050
32341991018,15cyclictest18296-21sshd08:20:200
32341999410,18cyclictest22189-21snmpd09:02:010
321662860,4sleep032172-21modprobe09:15:010
3119927520,32sleep031218-21fw_packets07:05:130
179612600,5sleep017962-21cat08:20:000
3234199599,16cyclictest15351-21/usr/sbin/munin10:15:270
32341995910,16cyclictest17028-21seq10:20:260
3234199589,17cyclictest7913-21ntpq09:45:250
32341995811,15cyclictest23184-21df10:45:130
3234199578,14cyclictest25700-21/usr/sbin/munin10:55:250
3234199577,14cyclictest20536-21/usr/sbin/munin10:35:110
3234199567,17cyclictest27334-21/usr/sbin/munin11:00:250
32341995611,16cyclictest5190-21ntpq11:40:220
3234199556,15cyclictest1266-21/usr/sbin/munin07:15:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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