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2025-12-20 - 11:00

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Sat Dec 20, 2025 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1184822320,2sleep011849-21which00:20:280
1817221520,2sleep018170-21grep20:35:020
542921480,3sleep05431-21switchtime23:55:240
120421410,2sleep01203-21sort21:35:010
1922021280,2sleep019221-21munin-run22:45:000
2376921190,2sleep023771-21wc20:55:270
2770321130,3sleep027708-21ntp_states19:05:190
417721120,3chrt4175-21grep19:40:160
2476621120,3sleep024677-21/usr/sbin/munin21:00:170
670321100,4sleep06706-21ntp_states21:55:230
3015121080,3chrt30149-21irqstats19:15:170
1022621000,3sleep010227-21latency_hist22:10:020
16832920,3sleep01682-21tr19:30:200
140912920,3sleep014007-21/usr/sbin/munin00:30:190
260502890,4sleep026096-21/usr/sbin/munin21:05:160
300062880,3sleep030079-21ps23:25:270
155812880,4sleep015612-21/usr/sbin/munin00:35:240
13072855,10sleep01313-21df_inode21:35:140
104412740,2sleep010442-21/usr/sbin/munin22:10:160
276662660,2sleep027667-21/usr/sbin/munin21:10:260
291392610,2sleep029152-21vmstat21:15:300
28616996111,16cyclictest8617-21sshd19:56:410
2861699609,18cyclictest11583-21/usr/sbin/munin22:15:280
28616996036,16cyclictest19827-21/usr/sbin/munin20:40:220
2861699599,17cyclictest23222-21/usr/sbin/munin23:00:190
2861699599,16cyclictest20621-21/usr/sbin/munin22:50:230
2861699597,17cyclictest4115-21/usr/sbin/munin21:45:210
28616995934,16cyclictest14251-21/usr/sbin/munin22:25:140
28616995910,17cyclictest15656-21memory22:30:190
2861699589,17cyclictest31148-21/usr/sbin/munin21:25:280
2861699589,16cyclictest19515-21sort22:45:170
28616995833,16cyclictest10816-21/usr/sbin/munin20:05:260
28616995833,15cyclictest16819-21/usr/sbin/munin22:35:150
28616995822,27cyclictest29299-21/usr/sbin/munin19:10:270
28616995811,16cyclictest21125-21/usr/sbin/munin20:45:240
2861699579,17cyclictest7722-21/usr/sbin/munin22:00:100
2861699579,15cyclictest9274-21/usr/sbin/munin00:10:260
2861699579,15cyclictest3665-21/usr/sbin/munin23:50:180
2861699579,14cyclictest2841-21/usr/sbin/munin19:35:170
2861699578,16cyclictest12720-21/usr/sbin/munin00:25:280
28616995734,14cyclictest9776-21/usr/sbin/munin20:00:290
28616995733,15cyclictest8143-21/usr/sbin/munin00:05:290
28616995733,15cyclictest6390-21/usr/sbin/munin00:00:170
28616995733,15cyclictest5216-21/usr/sbin/munin21:50:150
28616995731,16cyclictest7546-21runrttasks19:53:260
28616995731,16cyclictest32201-21runrttasks19:22:460
28616995710,16cyclictest288-21snmpd21:42:050
2861699569,15cyclictest32249-21/usr/sbin/munin23:35:300
2861699568,14cyclictest22055-21irqstats22:55:180
2861699568,14cyclictest12041-21ntp_states20:10:220
2861699567,16cyclictest32605-21/usr/sbin/munin19:25:200
2861699567,16cyclictest18605-21find20:35:250
2861699566,16cyclictest24510-21/usr/sbin/munin23:05:230
28616995612,17cyclictest30008-21irqstats21:20:150
28616995611,15cyclictest13189-21ntp_states22:20:220
2861699559,16cyclictest15638-21/usr/sbin/munin20:25:240
2861699559,15cyclictest22081-21egrep20:50:100
2861699558,15cyclictest10116-21/usr/sbin/munin00:15:260
2861699557,21cyclictest5495-21chrt19:45:180
2861699557,17cyclictest27032-21date23:15:010
2861699557,15cyclictest30967-21/usr/sbin/munin23:30:150
28616995529,17cyclictest15041-21runrttasks20:21:080
28616995510,17cyclictest27130-21df23:15:150
2861699548,13cyclictest33122chrt23:48:110
28616995428,16cyclictest28605-21/usr/sbin/munin23:20:180
28616995413,13cyclictest0-21swapper20:17:100
2861699528,16cyclictest1290-21memory23:40:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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