You are here: Home / Projects / OSADL QA Farm Real-time / Latency plots / 
2022-05-28 - 16:16

x86 Intel Xeon i3-1578L v5 @2000 MHz, Linux 4.19.1-rt3 (Profile)

Latency plot of system in rack #5, 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 rack5slot3.osadl.org (updated Sat May 28, 2022 12:50:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
5793992910,0cyclictest0-21swapper/612:06:206
5793992910,0cyclictest0-21swapper/611:33:336
5791992222,0cyclictest0-21swapper/511:50:065
5791992222,0cyclictest0-21swapper/511:50:065
5763992217,1cyclictest0-21swapper/211:54:002
5763992217,1cyclictest0-21swapper/211:54:002
5738992020,0cyclictest0-21swapper/010:37:290
5794991919,0cyclictest0-21swapper/710:31:547
579199187,10cyclictest4678-21sed08:20:015
5773991818,0cyclictest0-21swapper/309:56:403
5763991810,7cyclictest32509-21ssh12:37:052
5794991714,3cyclictest1633-21ntpd10:40:117
5793991714,3cyclictest25097-21nscd12:35:156
5781991717,0cyclictest0-21swapper/411:26:184
5751991710,7cyclictest0-21swapper/110:16:211
5738991715,1cyclictest31509-21ssh10:21:260
5793991610,0cyclictest0-21swapper/611:20:176
5791991610,0cyclictest0-21swapper/512:25:105
5763991615,1cyclictest32113-21ssh11:42:312
5763991615,1cyclictest17626-21ssh11:30:492
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional