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2022-05-28 - 15:55

Freescale i.MX6 Quad @996 MHz, Linux 5.16.2-rt19 (Profile)

Latency plot of system in rack #b, slot #7
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Sp99 -i200 -h400 -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackbslot7 (updated Sat May 28, 2022 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1998122810,14sleep3391rcuc/307:07:333
1942521139,31sleep119510-21unixbench_singl07:03:131
20060999735,17cyclictest25466-21latency_hist07:22:323
20060999735,17cyclictest25466-21latency_hist07:22:323
142432960,8sleep314242-21unin-run09:07:313
2005299873,50cyclictest1657-21sh09:52:452
20047998232,43cyclictest3108-21munin-plugin-st11:12:291
20047998213,8cyclictest129032basename08:57:301
20060998143,12cyclictest141rcu_preempt07:57:563
20047998122,12cyclictest0-21swapper/108:07:321
2004799803,18cyclictest5886-21idleruntime-cro08:02:291
2004799803,18cyclictest4424-21latency_hist07:57:321
20047998015,13cyclictest24621-21latency_hist12:02:301
2004799793,22cyclictest547-21grep07:43:021
2004799793,22cyclictest547-21grep07:43:021
20047997861,10cyclictest30944-21kworker/u8:012:17:291
2004799783,21cyclictest667-21munin-run12:22:291
2004799783,18cyclictest11792-21latency_hist08:47:321
20052997750,19cyclictest7047-21kworker/u8:312:37:292
2004799773,19cyclictest20499-21fschecks_time07:07:511
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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