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2026-09-14 - 04:24

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 Sep 14, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2210521300,4chrt22102-21ntp_states22:45:230
2076321180,3chrt20762-21/usr/sbin/munin20:35:140
674021160,4chrt6738-21netstat19:40:210
310899911410,89cyclictest16614-21latency00:30:180
790421120,3sleep07902-21switchtime23:55:240
286121120,3chrt2862-21vmstat23:35:300
31089991118,89cyclictest23269-21/usr/sbin/munin20:45:260
31089991109,71cyclictest6316-21/usr/sbin/munin21:45:250
310899911031,67cyclictest14915-21runrttasks20:11:110
31089991099,85cyclictest22274-21ntp_states20:40:210
31089991099,75cyclictest1489-21seq23:30:280
31089991098,88cyclictest14049-21/usr/sbin/munin22:15:180
31089991097,88cyclictest4822-21date23:45:020
31089991097,87cyclictest31911-21seq21:17:500
310899910929,69cyclictest8865-21runrttasks21:55:030
310899910926,72cyclictest10749-21/usr/sbin/munin19:55:240
31089991089,87cyclictest16769-21latency_hist20:20:020
31089991089,85cyclictest19449-21df20:30:140
31089991089,85cyclictest11471-21runrttasks22:05:060
310899910832,66cyclictest15446-21/usr/sbin/munin00:25:190
310899910810,85cyclictest7832-21df_inode19:45:140
310899910810,84cyclictest12224-21runrttasks00:13:100
151221080,2sleep01513-21cat19:20:170
31089991079,86cyclictest11797-21irqstats20:00:180
31089991079,84cyclictest24604-21df20:50:140
31089991078,85cyclictest10073-21df_inode00:05:140
31089991077,87cyclictest5465-21ntp_states19:35:220
310899910732,66cyclictest25627-21latency_hist23:00:020
310899910730,66cyclictest18763-21runrttasks20:25:520
310899910729,67cyclictest5175-21/usr/sbin/munin23:45:240
31089991069,84cyclictest1445-21ntp_states21:25:210
31089991068,84cyclictest27261-21ntp_states23:05:220
31089991068,84cyclictest2695-21/usr/sbin/munin19:25:140
31089991068,84cyclictest26582-21seq23:02:500
31089991068,83cyclictest29688-21wc21:10:020
31089991067,85cyclictest4705-21chrt21:38:380
31089991067,85cyclictest18463-21chrt00:36:220
31089991066,84cyclictest16830-21/usr/sbin/munin22:25:180
310899910631,64cyclictest28865-21/usr/sbin/munin23:10:290
310899910622,70cyclictest31384-21memory19:10:200
310899910610,82cyclictest9455-21/usr/sbin/munin19:50:260
31089991058,84cyclictest31263-21seq23:20:260
31089991058,84cyclictest2724-21ntp_states21:30:220
31089991056,86cyclictest4250-21ps19:30:260
31089991056,85cyclictest32431-21idleruntime21:20:180
310899910517,77cyclictest7653-21runrttasks21:50:130
310899910510,80cyclictest23388-21ntpq22:50:220
873121040,3sleep08732-21/usr/sbin/munin00:00:160
31089991048,83cyclictest21775-21grep22:45:020
31089991048,82cyclictest14089-21/usr/sbin/munin00:20:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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