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2019-12-13 - 04:02

Intel(R) Celeron(R) CPU N3350 @ 1.10GHz, Linux 4.18.7-rt5 (Profile)

Latency plot of system in rack #c, slot #4
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
The worst-case latency is about 1.68 times higher under extreme CPU load.
Results of all systems under extreme CPU load are combined on this summary graph.
The worst-case latency is about 1.84 times higher under graphics load.
Results of all systems with accelerated graphics are combined on this summary graph.
Characteristics of the 20 highest latencies:
System rackcslot4.osadl.org (updated Thu Dec 12, 2019 12:44:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
226452324278,25sleep10-21swapper/107:08:071
226662320278,25sleep00-21swapper/007:08:140
2313199159140,3cyclictest9354-21strings07:50:091
2312999153142,2cyclictest0-21swapper/007:50:100
156802770,29sleep188950irq/124-enp2s009:20:021
16082740,0sleep01606-21ps10:00:170
242232590,4sleep123025-21/usr/sbin/munin10:50:231
252042530,2sleep0101ktimersoftd/010:55:030
70592520,4sleep123-21rcuc/109:00:061
23131995217,12cyclictest24073-21gltestperf07:10:111
23129995118,14cyclictest5422-21/usr/sbin/munin08:55:130
23129995024,9cyclictest3856-21taskset08:50:370
23129995024,9cyclictest3856-21taskset08:50:370
23129995024,10cyclictest6866-21cpu09:00:050
23129995020,11cyclictest4892-21taskset07:40:100
2313199496,25cyclictest10760-21latency_hist11:35:011
2313199496,11cyclictest25046-21kworker/1:309:40:211
23131994925,5cyclictest15317-21switchtime10:30:171
23131994917,5cyclictest20718-21swap08:15:191
23131994914,9cyclictest26540-21fschecks_time08:30:091
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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