You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2023-05-31 - 12:59

x86 Intel Atom x6425E @2000 MHz, Linux 5.15.49-rt47 (Profile)

Latency plot of system in rack #e, slot #3
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 rackeslot3 (updated Wed May 31, 2023 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2072957996959,8cyclictest0-21swapper/221:45:292
207295799690,68cyclictest0-21swapper/221:45:002
2072957996737,28cyclictest2108087-21kworker/2:121:00:202
2072957996533,31cyclictest2191658-21kworker/2:122:55:232
2072957996461,2cyclictest0-21swapper/223:12:072
2072957996461,2cyclictest0-21swapper/222:30:062
2072957996436,26cyclictest2191658-21kworker/2:123:05:242
2072957996361,1cyclictest0-21swapper/200:08:022
2072957996343,19cyclictest2147190-21kworker/2:222:19:422
2072957996259,2cyclictest0-21swapper/223:55:132
2072957996258,2cyclictest0-21swapper/222:10:082
2072957996240,21cyclictest2202186-21kworker/2:023:30:202
2072957996229,31cyclictest2202186-21kworker/2:023:20:222
2072957996158,2cyclictest0-21swapper/221:17:022
2072957996143,17cyclictest2245200-21kworker/2:100:20:202
2072957996137,23cyclictest2147190-21kworker/2:222:00:212
2072957996132,27cyclictest4065770-1kworker/2:0H23:40:192
2072957996057,2cyclictest0-21swapper/223:01:372
2072957996057,2cyclictest0-21swapper/200:00:342
2072957996043,16cyclictest4065770-1kworker/2:0H21:55:522
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional