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2026-03-13 - 08:42

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 50 highest latencies:
System rack4slot6s.osadl.org (updated Fri Mar 13, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2977423010,3sleep029777-21latency_hist20:35:010
706122660,4sleep07062-21modprobe23:17:000
964022540,2sleep09643-21switchtime19:15:280
168521160,3chrt1686-21sendmail_mailst20:50:250
1520221110,4chrt15201-21wc23:50:010
2247921080,2chrt22481-21sed22:10:260
77709910581,14cyclictest20246-21chrt22:02:380
146342940,4sleep014696-21/usr/sbin/munin21:40:270
229482920,3sleep022937-21latency_hist00:20:020
7770999164,16cyclictest10094-21chrt21:24:050
7770998864,14cyclictest20563-21fw_packets00:10:140
7770998857,20cyclictest15496-21/usr/sbin/munin21:45:290
7770998759,19cyclictest32218-21chrt20:44:100
7770998759,15cyclictest26493-21seq22:25:560
7770998661,15cyclictest17701-21chrt19:47:000
7770998660,16cyclictest23282-21ls00:20:180
41712860,3sleep04221-21grep21:00:250
223962860,3sleep022453-21processes20:05:240
7770998562,13cyclictest17360-21timerwakeupswit21:50:290
154662850,4sleep015492-21idleruntime-cro19:40:000
7770998459,14cyclictest25998-21grep00:30:250
7770998361,13cyclictest12097-21seq23:35:560
7770998360,14cyclictest1290-21memory22:55:190
7770998359,14cyclictest2851-21ntp_states20:55:240
7770998358,14cyclictest17963-21/usr/sbin/munin00:00:110
7770998260,12cyclictest27128-21munin-run20:25:010
7770998255,17cyclictest13332-21uptime23:40:290
7770998252,18cyclictest276-21runrttasks19:56:280
301772820,3sleep030223-21processes20:35:270
7770998055,15cyclictest15744-21if_eth019:40:160
7770998053,14cyclictest24222-21seq20:12:360
7770997958,12cyclictest25726-21latency_hist22:25:000
7770997957,12cyclictest27515-21awk20:25:210
7770997956,14cyclictest6350irq/103-63fec0022:45:190
7770997956,14cyclictest10757-21ntp_states19:20:190
7770997955,14cyclictest573-21/usr/sbin/munin20:45:290
7770997954,13cyclictest288-21snmpd21:25:480
7770997863,10cyclictest6054-21sshd23:14:220
7770997855,13cyclictest18698-21wc19:50:270
7770997851,17cyclictest5216-21df_inode21:05:140
7770997847,20cyclictest6350irq/103-63fec0020:20:000
7770997755,12cyclictest276-21runrttasks20:02:050
7770997753,14cyclictest28696-21ntp_states22:35:230
7770997653,14cyclictest6695-21/usr/sbin/munin21:10:210
707627620,31sleep07151-21/usr/sbin/munin19:05:250
7770997555,13cyclictest13151-21if_eth019:30:160
7770997553,14cyclictest21324-21chrt22:05:550
7770997549,17cyclictest6350irq/103-63fec0019:25:330
7770997455,12cyclictest20361-21munin-run00:10:010
7770997453,12cyclictest9170-21ntp_states23:25:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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