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2026-05-11 - 01:43

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 May 10, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
69623130,3sleep0697-21df11:45:140
383122450,2sleep03829-21open_inodes07:45:240
1806822310,2sleep018069-21cut10:45:260
3066721450,3sleep030666-21sshd09:30:020
2202621440,2sleep022027-21cat11:00:270
3263821240,4chrt32640-21wc07:30:270
3000021240,4chrt29998-21users09:25:280
799021030,3sleep07992-21sshd10:06:260
1149321000,4sleep011156-21/usr/sbin/munin10:20:250
238822960,3sleep0288-21snmpd11:09:430
271192926,11sleep027121-21missed_timers07:10:170
13042926,10sleep0288-21snmpd09:40:280
88092918,68sleep08853-21if_eth008:05:150
306962880,4sleep030734-21sed07:25:000
23882855,11sleep02389-21ntp_states09:45:210
127592825,62sleep012794-21load08:20:180
101382800,2sleep010133-21if_eth008:10:160
319822770,2sleep031978-21awk07:30:000
204672760,3sleep020497-21/usr/sbin/munin10:55:260
2677927521,32sleep026780-21cron07:10:000
2682999647,48cyclictest31656-21kworker/u2:111:55:320
60282630,2sleep06027-21sed07:55:010
26829996212,17cyclictest22994-21df_inode09:00:150
26829996110,20cyclictest6387-21ntpq07:55:190
26829996018,15cyclictest21528-21date08:55:020
26829996018,13cyclictest288-21snmpd10:29:260
254572600,2sleep025458-21latency_hist09:10:020
2682999598,18cyclictest5983-21/usr/sbin/munin10:00:200
2682999598,18cyclictest29224-21/usr/sbin/munin11:30:150
26829995935,15cyclictest10352-21/usr/sbin/munin10:15:260
26829995916,14cyclictest273662chrt11:21:190
26829995910,17cyclictest7437-21/usr/sbin/munin08:00:190
26829995910,15cyclictest2093-21munin-run07:40:010
2682999589,17cyclictest4672-21/usr/sbin/munin09:55:160
2682999589,16cyclictest28213-21/usr/sbin/munin07:15:170
26829995834,15cyclictest7566-21/usr/sbin/munin12:10:240
26829995833,17cyclictest18172-21/usr/sbin/munin08:40:250
2682999578,17cyclictest19055-21/usr/sbin/munin08:45:120
2682999578,16cyclictest31971-21/usr/sbin/munin09:35:250
2682999578,16cyclictest28372-21/usr/sbin/munin09:20:200
2682999577,17cyclictest4944-21mailstats12:00:230
2682999577,16cyclictest2231-21/usr/sbin/munin07:40:230
26829995734,14cyclictest11943-21runrttasks08:15:500
26829995733,15cyclictest22105-21/usr/sbin/munin08:55:280
26829995733,15cyclictest15605-21/usr/sbin/munin10:35:300
26829995732,17cyclictest9804-21/usr/sbin/munin12:20:140
26829995731,16cyclictest14177-21/usr/sbin/munin08:25:210
26829995710,16cyclictest25924-21users11:15:280
26829995710,14cyclictest288-21snmpd09:15:270
2682999569,16cyclictest24333-21ntp_states11:10:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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