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2025-03-18 - 04:34

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 20 highest latencies:
System rackfslot4s.osadl.org (updated Tue Mar 18, 2025 00:45:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1660421190,3chrt16606-21aten2.4_rfpower20:40:520
2249721180,2chrt30278-21diskmemload23:08:320
2885821160,2chrt28859-21cpu20:00:520
152721160,3chrt793-21/usr/sbin/munin21:16:040
1139121160,2chrt11392-21sleep22:45:040
2418621150,4chrt23235-21sendmail-msp22:02:010
2866421140,3chrt28646-21ntpq22:11:170
2109121140,3chrt21092-21ntpq19:43:090
2806421120,3chrt28065-21sleep23:18:330
230221090,2chrt2298-21ntpq20:11:240
2054321090,2chrt20544-21ssh00:10:560
2217221080,2chrt22173-21sleep19:45:350
1230821060,2chrt12309-21sleep20:31:080
3105021030,3chrt31051-21sh22:16:030
2540521020,2chrt25406-21sleep20:56:390
592121010,2chrt5922-21sh19:13:200
2328521000,2sleep023286-21latency_hist22:00:070
80582940,2sleep08056-21smart_sda20:23:430
175952920,2sleep017596-21rm00:03:550
37232890,2sleep03726-21grep23:35:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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