You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2022-10-04 - 02:23

x86 Intel Atom Z530 @1600 MHz, Linux 3.12.61-rt81 (Profile)

Latency plot of system in rack #1, slot #8
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 rack1slot8.osadl.org (updated Tue Oct 04, 2022 00:43:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
146959918421750,83cyclictest0-21swapper/022:30:210
146512987964,15sleep00-21swapper/019:09:560
1469699513435,45cyclictest0-21swapper/123:08:031
1469599453358,89cyclictest0-21swapper/019:20:200
1469699452387,49cyclictest0-21swapper/119:10:021
1469599377301,52cyclictest0-21swapper/023:08:040
1469699375271,24cyclictest6093-21strings22:30:211
2119991630,4rtkit-daemon2118-21rtkit-daemon00:02:290
14696991082,69cyclictest18244-21cpuspeed19:20:201
1469599934,74cyclictest0-21swapper/019:10:020
1424929049,29sleep10-21swapper/119:05:571
211999840,4rtkit-daemon2118-21rtkit-daemon22:15:471
1469599796,65cyclictest0-21swapper/023:35:020
1469599796,65cyclictest0-21swapper/023:35:020
1469599773,65cyclictest20626-21ssh22:55:150
1469599768,61cyclictest0-21swapper/023:35:250
1469599764,45cyclictest415-21ssh22:20:280
1469599762,7cyclictest1741-21rm23:16:410
1469599752,16cyclictest22167-21diskmemload00:16:590
1469599752,16cyclictest22167-21diskmemload00:16:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional