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2026-06-25 - 21:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot6s.osadl.org (updated Thu Jun 25, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1249222480,3sleep012496-21latency12:00:170
637422460,2sleep06376-21timerandwakeup11:35:270
1377221820,3sleep013770-21grep12:05:170
1256214721,33sleep01274-21ntp_states07:05:190
2129621460,2sleep021292-21latency_hist12:35:020
418121080,3sleep03573-21/usr/sbin/munin07:15:290
2812721060,4sleep028162-21load10:55:180
99921010,4sleep01071-21/usr/sbin/munin11:15:240
1131021010,4sleep011308-21ntp_states11:55:230
112102980,3sleep011250-21latency_hist07:45:020
285052926,10sleep028550-21mailstats08:50:260
167652920,4sleep016821-21mailstats10:10:250
47442910,2sleep04747-21cpu09:25:110
317922885,9sleep0288-21snmpd09:04:280
230192880,3sleep023022-21sed10:35:170
114572876,9sleep011484-21ntp_states09:50:190
304452860,3sleep030479-21sed11:05:010
62892826,61sleep06293-21ntp_states09:30:240
84452808,59sleep08489-21cpu11:45:100
33702770,4sleep03414-21if_eth011:25:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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