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2025-12-07 - 00:40

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackfslot4s.osadl.org (updated Sat Dec 06, 2025 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
570121310,2sleep05700-21/usr/sbin/munin07:25:490
1841521190,2chrt18414-21/usr/sbin/munin07:50:560
958021140,2chrt9581-21/usr/sbin/munin10:36:190
160512990,2sleep016107-21sort09:50:370
221342980,3chrt22135-21sh07:59:230
303112910,2sleep030312-21smartctl09:17:220
274052910,2sleep027406-21ld09:12:370
165352840,2chrt16515-21ntpq11:46:500
76582830,2sleep07659-21cut07:30:350
134642820,2sleep013463-21grep09:45:530
301272810,2sleep030129-21basename08:15:000
289452790,1sleep028942-21cat12:10:040
128782790,2sleep012871-21awk08:45:010
83502780,2sleep08353-21cut09:36:140
129662780,2sleep012967-21fschecks_time11:40:520
109042780,2sleep010906-21awk11:36:390
130762760,2sleep013077-21aten2.4_rfpower08:45:250
28162750,2sleep02819-21sort09:26:120
219782750,2sleep021979-21ld11:56:390
270712708,46sleep026688-21apt-get07:05:130
152162700,2sleep015217-21sshd07:45:310
248842680,1sleep024885-21ssh12:01:560
122102630,2sleep012213-21tr07:40:000
12332573,7sleep01235-21ntpq10:21:210
237982555,9sleep023804-21ssh10:04:270
77672532,7sleep07744-21ssh12:30:350
75042520,3sleep07505-21/usr/sbin/munin11:30:590
325702520,1sleep032571-21tune2fs07:15:350
29508905020,23cyclictest0-21swapper11:25:240
29508905018,24cyclictest0-21swapper11:20:050
305082492,6sleep030485-21ssh12:12:080
292752490,2chrt29246-21ssh11:11:340
160422490,3sleep016040-21ssh10:47:540
69052480,2sleep06902-21ssh12:28:100
29508904819,21cyclictest0-21swapper11:53:190
181212483,7sleep018175-21aten2.4-expect08:55:240
48712470,3chrt4869-21/usr/sbin/munin09:30:410
29508904717,22cyclictest0-21swapper12:35:100
29508904618,21cyclictest0-21swapper10:40:060
29508904612,18cyclictest25616-21ntpq10:07:080
2950890455,21cyclictest10194-21/usr/sbin/munin09:40:390
29508904514,23cyclictest0-21swapper11:07:570
29508904417,21cyclictest0-21swapper12:22:440
29508904415,22cyclictest0-21swapper10:19:230
2950890436,17cyclictest5040-21ssh10:28:310
29508904320,16cyclictest0-21swapper11:18:560
2950890426,10cyclictest6565-21ntp_states08:31:110
2950890425,10cyclictest18066-21ntpq10:51:330
2950890424,20cyclictest1516-21ntp_states08:21:100
2950890424,18cyclictest24294-21ntpq09:06:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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