You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2023-06-11 - 02:42

x86 Intel Core i7-2600K @3400 MHz, Linux 5.9.0-rc2-rt1 (Profile)

Latency plot of system in rack #4, slot #6
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 -h200 -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 10 highest latencies:
System rack4slot6.osadl.org (updated Sun Jun 11, 2023 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1396499443440,2cyclictest19-21ksoftirqd/119:10:011
1396499440438,1cyclictest19-21ksoftirqd/119:10:021
13664521050,100pltrace0-21swapper/319:10:003
1085352860,76pltrace0-21swapper/719:05:567
1601752790,1pltrace16022-21pltrace-run23:54:295
1289927240,16sleep00-21swapper/019:05:340
1338427155,12sleep50-21swapper/519:05:475
1174327145,12sleep20-21swapper/219:05:192
29732690,0sleep00-21swapper/023:40:200
1127926953,12sleep60-21swapper/619:05:166
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional