You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2023-05-28 - 18:36

x86 Intel Atom E3845 @1910 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #1
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 -Up99 -i200 -h400 --smi -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackdslot1.osadl.org (updated Sun May 28, 2023 12:46:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1176911770,8ptp4l0-21swapper/207:09:342
1176911690,8ptp4l0-21swapper/107:05:421
1176911470,9ptp4l0-21swapper/007:05:400
2498321310,7sleep1243999cyclictest12:35:241
3275521280,5sleep2244099cyclictest11:40:392
2669721170,4sleep01159-21snmpd11:30:210
1176911120,6ptp4l41-21ksoftirqd/307:08:043
195282900,9sleep1243999cyclictest10:05:241
117691750,2ptp4l101ktimersoftd/007:20:510
117691720,6ptp4l1185-21lldpd10:37:250
117691720,6ptp4l0-21swapper/010:56:260
160852710,8sleep3244199cyclictest08:45:423
117691700,6ptp4l1159-21snmpd07:37:190
117691700,6ptp4l1159-21snmpd07:37:180
117691700,2ptp4l0-21swapper/111:36:351
117691700,27ptp4l216-21systemd-journal08:50:360
117691700,1ptp4l101ktimersoftd/009:43:330
117691690,27ptp4l1159-21snmpd11:42:501
117691690,10ptp4l1159-21snmpd11:53:350
117691670,9ptp4l0-21swapper/208:04:192
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional