You are here: Home / Projects / QA Farm Realtime / Latency plots / 
2021-01-20 - 14:03

Intel(R) Atom(TM) CPU E3845 @ 1.91GHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #4
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 50 highest latencies:
System rackdslot4.osadl.org (updated Fri Jan 15, 2021 00:46:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1203221660,9sleep32986099cyclictest23:05:113
120791146125,9phc2sys0-21swapper/319:07:593
120791146125,9phc2sys0-21swapper/319:07:583
2670821050,3sleep20-21swapper/219:05:062
2670821050,3sleep20-21swapper/219:05:062
2933028664,10sleep10-21swapper/119:08:531
2933028664,10sleep10-21swapper/119:08:531
291862825,11sleep00-21swapper/019:07:030
291862825,11sleep00-21swapper/019:07:020
29857997865,8cyclictest9-21ksoftirqd/023:05:040
29857997669,4cyclictest9-21ksoftirqd/000:10:080
29857997160,6cyclictest9-21ksoftirqd/023:20:030
29857996850,11cyclictest9-21ksoftirqd/023:25:080
29857996850,11cyclictest9-21ksoftirqd/023:25:070
29857996654,6cyclictest9-21ksoftirqd/021:45:090
29857996648,12cyclictest9-21ksoftirqd/019:10:060
29857995947,7cyclictest9-21ksoftirqd/023:45:090
174742590,5sleep117437-21apt-get22:30:041
120891570,1ptp4l391rcuc/322:56:293
120891560,1ptp4l391rcuc/323:52:073
29857995445,5cyclictest9-21ksoftirqd/023:55:090
29857995339,8cyclictest9-21ksoftirqd/019:40:030
29857995237,7cyclictest9-21ksoftirqd/000:35:060
29857994741,4cyclictest9-21ksoftirqd/020:40:080
29857994641,3cyclictest9-21ksoftirqd/022:40:060
2986099452,36cyclictest30124-21apt-get22:45:083
29857994538,4cyclictest9-21ksoftirqd/022:05:050
29857994538,4cyclictest9-21ksoftirqd/022:05:040
2986099443,34cyclictest0-21swapper/323:10:083
2986099443,33cyclictest15052-21apt-get21:00:083
29857994438,4cyclictest9-21ksoftirqd/019:25:060
120891440,1ptp4l401ktimersoftd/321:05:223
2986099434,33cyclictest0-21swapper/300:00:083
2986099432,34cyclictest23325-21apt-get21:55:043
29860994313,26cyclictest17259-21processes23:55:103
29857994337,4cyclictest9-21ksoftirqd/023:50:040
29857994336,4cyclictest9-21ksoftirqd/022:25:060
29857994329,8cyclictest9-21ksoftirqd/019:15:080
120891430,1ptp4l401ktimersoftd/321:32:093
120891430,1ptp4l401ktimersoftd/320:35:183
120891430,1ptp4l401ktimersoftd/319:20:113
2986099423,33cyclictest25008-21apt-get22:40:033
2986099422,6cyclictest25633-21apt-get23:25:023
2986099422,6cyclictest25633-21apt-get23:25:023
29860994225,14cyclictest41-21ksoftirqd/321:51:403
29860994224,15cyclictest41-21ksoftirqd/321:27:343
2985899422,33cyclictest18500-21apt-get20:20:081
29858994219,18cyclictest24542-21latency20:30:121
120891420,1ptp4l401ktimersoftd/319:29:123
2986099413,32cyclictest0-21swapper/320:10:073
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional