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2026-04-10 - 22:14

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 Fri Apr 10, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2849622540,3sleep028497-21cat08:00:030
87222500,2sleep0871-21sort12:30:010
3119322410,2sleep031190-21grep10:15:190
677222300,3sleep06771-21wc10:45:270
1197121210,3chrt11970-21/usr/sbin/munin09:00:260
1971721200,2sleep019718-21fgrep09:30:250
2206921190,4chrt21766-21/usr/sbin/munin11:45:240
1310421110,3chrt13105-21awk09:05:180
2212121100,3sleep022055-21/usr/sbin/munin07:35:140
1518121080,3chrt15180-21munin-plugin-st11:20:010
2439621030,4sleep024434-21/usr/sbin/munin11:55:130
15503999870,15cyclictest32429-21memory10:20:170
15503999867,18cyclictest1640-21/usr/sbin/munin08:20:250
15503999867,18cyclictest10082-21sed11:00:010
15503999667,17cyclictest5535-21systemctl08:35:250
15503999568,15cyclictest27128-21df_inode10:00:130
15503999467,16cyclictest32530-21irqstats08:15:180
15503999368,14cyclictest2205-21/usr/sbin/munin12:35:290
15503999367,17cyclictest12783-21df_inode11:10:140
15503999268,12cyclictest24108-21seq09:48:060
15503999266,14cyclictest1902-21chrt12:33:340
15503999265,15cyclictest10439-21/usr/sbin/munin08:55:170
15503999264,17cyclictest11723-21ntp_states11:05:210
15503999264,15cyclictest7637-21cat08:45:010
15503999263,18cyclictest8958-21sshd08:50:080
15503999263,17cyclictest17864-21sed11:30:020
15503999262,20cyclictest23428-21/usr/sbin/munin07:40:130
15503999248,15cyclictest276-21runrttasks08:45:580
15503999167,14cyclictest21768-21munin-run09:40:020
15503999166,14cyclictest28354-21/usr/sbin/munin10:05:140
15503999166,14cyclictest276-21runrttasks07:33:420
15503999165,16cyclictest29579-21/usr/sbin/munin12:15:130
15503999165,15cyclictest3960-21ntp_states10:35:210
15503999165,15cyclictest19253-21chrt07:24:100
15503999165,15cyclictest16859-21cat09:20:140
15503999165,14cyclictest3553-21runrttasks08:29:020
15503999164,17cyclictest2131-21apt-get10:29:130
15503999160,19cyclictest10336-21memory11:00:180
15503999065,14cyclictest24766-21ntp_states09:50:210
15503999064,15cyclictest15514-21seq11:20:160
15503999056,21cyclictest29230-21sshd08:01:130
15503998966,14cyclictest25785-21irqstats12:00:130
15503998965,13cyclictest24744-21if_err_eth007:45:130
15503998964,16cyclictest27481-21chrt12:05:250
15503998958,19cyclictest288-21snmpd09:13:420
15503998956,20cyclictest18089-21sendmail-msp07:20:000
15503998866,13cyclictest30933-21if_eth012:20:140
15503998865,14cyclictest7740-21memory10:50:180
15503998865,12cyclictest3480-21chrt10:34:300
15503998862,15cyclictest28682-21grep12:10:260
15503998858,20cyclictest5034-21/usr/sbin/munin10:40:110
15503998856,19cyclictest25989-21chrt07:50:120
15503998853,21cyclictest29637-21/usr/sbin/munin10:10:260
15503998760,16cyclictest26861-21chrt09:59:390
15503998758,17cyclictest15575-21seq09:15:160
15503998755,20cyclictest20481-21/usr/sbin/munin11:40:130
15503998752,21cyclictest29946-21interrupts08:05:150
15503998752,21cyclictest15604-21/usr/sbin/munin07:10:150
15503998660,17cyclictest18093-21missed_timers11:30:170
15503998657,17cyclictest31153-21chrt08:10:120
15503998657,16cyclictest22197-21runrttasks09:40:200
15503998653,21cyclictest19173-21/usr/sbin/munin11:35:200
15503998651,23cyclictest3804-21/usr/sbin/munin08:30:110
15503998563,13cyclictest19638-21irqstats07:25:170
15503998552,20cyclictest23048-21/usr/sbin/munin11:50:100
15503998551,20cyclictest18028-21munin-node09:25:100
15503998155,16cyclictest15520-21sort07:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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