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2026-07-06 - 04:56

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 Mon Jul 06, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2900821740,2sleep029009-21sshd19:48:160
96821370,4chrt769-21/usr/sbin/munin20:05:180
600221320,3chrt5944-21/usr/sbin/munin20:25:140
2960321130,3chrt29604-21/usr/sbin/munin19:50:200
981721057,11sleep09824-21egrep20:40:100
1935421020,4sleep019422-21/usr/sbin/munin19:10:240
263062968,12sleep026399-21modprobe23:50:020
196412960,2sleep019642-21sshd23:23:170
25432950,3sleep02604-21timerandwakeup20:10:290
320982940,4sleep032170-21/usr/sbin/munin22:05:280
59772910,4sleep06055-21mailstats00:35:270
259192910,3sleep025984-21switchtime19:35:280
253632910,3sleep025436-21latency_hist19:35:020
42002876,67sleep04216-21munin-run00:30:000
207472830,3sleep020806-21wc19:15:260
191442786,60sleep019143-21ntp_states21:15:230
124422783,5sleep00-21swapper20:50:140
1790327722,31sleep017914-21memory19:05:170
145672746,13sleep0288-21snmpd23:04:090
89932727,53sleep0288-21snmpd22:40:450
1892399619,18cyclictest13664-21/usr/sbin/munin20:55:190
18923996033,17cyclictest30599-21/usr/sbin/munin22:00:160
18923996010,18cyclictest288-21snmpd21:36:210
18923995935,15cyclictest20686-21/usr/sbin/munin21:20:290
18923995935,14cyclictest14894-21/usr/sbin/munin23:05:150
18923995934,15cyclictest2210-21/usr/sbin/munin22:15:240
18923995933,17cyclictest7309-21/usr/sbin/munin20:30:140
18923995921,27cyclictest921-21/usr/sbin/munin22:10:250
18923995919,13cyclictest30303-21/usr/sbin/munin00:05:200
18923995910,20cyclictest30920-21ntp_states19:55:220
18923995910,19cyclictest22688-21irqstats23:35:170
1892399589,17cyclictest7234-21chrt22:35:160
1892399589,17cyclictest28187-21ntp_states21:50:240
1892399588,17cyclictest3341-21/usr/sbin/munin20:15:150
18923995833,16cyclictest17968-21/usr/sbin/munin23:15:290
18923995833,15cyclictest32027-21/usr/sbin/munin20:00:140
18923995832,16cyclictest11694-21/usr/sbin/munin20:45:280
18923995812,17cyclictest30182-21munin-run00:05:010
18923995810,18cyclictest28977-21cat00:00:010
1892399579,16cyclictest1773-21/usr/sbin/munin00:20:210
1892399579,14cyclictest23359-21readlink19:25:250
1892399579,14cyclictest23021-21ntp_states21:30:210
1892399578,16cyclictest16607-21grep23:10:280
18923995733,16cyclictest22195-21/usr/sbin/munin19:20:290
18923995733,16cyclictest15247-21/usr/sbin/munin21:00:220
18923995718,14cyclictest1-21systemd21:58:180
1892399569,17cyclictest17848-21ntp_states21:10:220
1892399568,18cyclictest8630-21if_eth020:35:160
1892399568,15cyclictest4628-21irqstats22:25:170
1892399567,16cyclictest16268-21/usr/sbin/munin21:05:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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