You are here: Home / Projects / QA Farm Realtime / Latency plots / 
2022-01-22 - 15:26

Intel(R) Atom(TM) CPU N455 @ 1.66GHz, Linux 5.4.34-rt21 (Profile)

Latency plot of system in rack #3, slot #6
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 50 highest latencies:
System rack3slot6 (updated Sat Jan 22, 2022 12:45:20)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1688021200,9sleep11369-21cyclictest09:30:281
103229413,42sleep00-21swapper/007:07:380
3221628832,43sleep10-21swapper/107:05:181
141412880,19sleep1138799cyclictest09:20:511
58452860,10sleep0111rcu_preempt12:10:010
1379998516,11cyclictest9-21ksoftirqd/007:21:310
1379998222,37cyclictest9-21ksoftirqd/011:00:350
1379997818,24cyclictest9-21ksoftirqd/009:21:140
1379997639,13cyclictest9-21ksoftirqd/011:00:010
1379997521,31cyclictest9-21ksoftirqd/012:00:150
1379997446,10cyclictest6601-21apt-get09:00:160
1379997436,13cyclictest9-21ksoftirqd/007:40:190
1379997425,13cyclictest9-21ksoftirqd/008:40:230
296402730,5sleep10-21swapper/108:30:351
1379997328,9cyclictest12318-21cat07:40:010
1379997315,24cyclictest9-21ksoftirqd/011:21:300
1387997241,18cyclictest15650irq/30-ahci[00008:40:211
1379997228,24cyclictest9-21ksoftirqd/011:40:000
1379997224,13cyclictest9-21ksoftirqd/012:20:400
1387997139,18cyclictest15650irq/30-ahci[00011:40:211
1387997036,20cyclictest15650irq/30-ahci[00009:00:151
1387996940,17cyclictest488-21dbus-daemon10:00:211
1387996938,21cyclictest15650irq/30-ahci[00010:20:221
1379996930,14cyclictest9-21ksoftirqd/010:00:250
1387996839,18cyclictest225-21jbd2/sda1-812:20:151
1379996832,12cyclictest9-21ksoftirqd/008:00:240
1379996831,13cyclictest9-21ksoftirqd/008:20:370
1379996829,15cyclictest9-21ksoftirqd/011:54:590
1379996829,10cyclictest20723-21missed_timers09:40:390
1387996740,14cyclictest225-21jbd2/sda1-810:40:161
1387996734,23cyclictest488-21dbus-daemon09:40:211
137999677,49cyclictest8911-21apt-get07:30:170
1379996731,12cyclictest9-21ksoftirqd/011:40:330
1379996729,12cyclictest9-21ksoftirqd/009:40:030
223792660,6sleep00-21swapper/009:45:310
1387996614,45cyclictest0-21swapper/112:15:181
1379996632,11cyclictest9-21ksoftirqd/009:30:000
1379996630,16cyclictest9-21ksoftirqd/010:20:530
110622660,7sleep00-21swapper/012:25:230
32362650,21sleep1138799cyclictest12:00:451
1379996528,12cyclictest9-21ksoftirqd/010:40:510
248562640,15sleep1138799cyclictest08:15:431
1379996431,11cyclictest9-21ksoftirqd/009:20:010
1379996427,13cyclictest9-21ksoftirqd/009:35:010
77542636,10sleep10-21swapper/107:25:431
1387996330,26cyclictest488-21dbus-daemon11:00:261
1379996328,13cyclictest9-21ksoftirqd/008:00:030
1387996242,10cyclictest12189-21sendmail-msp07:40:581
1387996232,18cyclictest15650irq/30-ahci[00008:20:201
1379996227,13cyclictest9-21ksoftirqd/008:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

Valid XHTML 1.0 Transitional