You are here: Home / Projects / QA Farm Realtime / Latency plots / 
2021-09-17 - 21:57

Intel(R) Pentium(R) CPU 2020M @ 2.40GHz, Linux 4.16.15-rt7 (Profile)

Latency plot of system in rack #6, slot #2
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
Characteristics of the 20 highest latencies:
System rack6slot2.osadl.org (updated Thu Jan 02, 2020 12:43:26)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1987425115,8sleep00-21swapper/007:05:580
1964124410,8sleep10-21swapper/107:03:351
2016199117,1cyclictest7882-22perl10:03:181
2016199117,1cyclictest0-21swapper/110:37:101
2016199116,2cyclictest9199-21latency_hist11:58:141
2016199110,9cyclictest6378-22fschecks_time09:58:191
2016199110,9cyclictest21396-22iostat10:48:201
2016199110,8cyclictest30729-22/usr/sbin/munin07:43:281
2016199110,8cyclictest14996-22/usr/sbin/munin10:28:211
2016199110,2cyclictest19448-22/usr/sbin/munin10:43:201
2016199110,2cyclictest11553-21rm08:28:141
2016199110,10cyclictest0-21swapper/110:28:141
2016199110,1cyclictest15340-22/usr/sbin/munin12:18:171
2016199108,1cyclictest29403-22df_abs07:38:171
2016199108,1cyclictest28206-22iostat_ios07:33:221
2016199106,2cyclictest5776-22/usr/sbin/munin08:08:231
2016199106,0cyclictest0-21swapper/108:38:251
2016199105,2cyclictest1983-22if_enp0s29u1u209:43:201
2016199102,1cyclictest0-21swapper/111:03:181
2016199100,9cyclictest9095-22grep10:08:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional