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2025-11-08 - 22:06

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 50 highest latencies:
System rackfslot4s.osadl.org (updated Sat Nov 08, 2025 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2240121310,2chrt22402-21sh08:17:380
2526721270,2chrt25268-21sh12:21:020
2258921240,2chrt22586-21ssh09:21:100
2903321190,3chrt29036-21idleruntime-cro11:30:000
1266221190,2sleep012665-21timerandwakeup11:58:040
149521170,3sleep01497-21base6410:40:150
1969421120,3chrt19695-21ssh10:14:420
3234121110,3chrt32339-21df_inode11:35:430
179942790,2sleep017995-21ls11:10:030
131352760,2sleep013138-21sort11:00:550
279022670,2sleep027903-21ssh10:29:210
326702640,2sleep032672-21swap10:37:170
87102550,1sleep08714-21sed11:51:060
164892520,2sleep016490-21missed_timers08:05:500
317402510,2sleep031741-21ld08:35:570
19839905118,23cyclictest0-21swapper09:38:420
19839905018,22cyclictest0-21swapper09:53:390
19839904918,23cyclictest0-21swapper12:03:320
19839904918,22cyclictest0-21swapper10:34:300
19839904817,23cyclictest0-21swapper11:47:590
19839904813,25cyclictest0-21swapper07:25:330
36832470,2chrt3681-21/usr/sbin/munin08:45:330
221652470,3chrt22158-21ssh10:18:430
19839904718,22cyclictest0-21swapper10:54:500
19839904717,23cyclictest0-21swapper12:09:450
19839904717,22cyclictest0-21swapper12:12:340
281112460,3chrt28112-21latency_hist08:30:020
275962460,3chrt27580-21ssh12:25:260
1983990465,20cyclictest25440-21ssh10:25:050
19839904618,22cyclictest0-21swapper07:17:060
19839904616,22cyclictest0-21swapper10:59:020
1864924610,19sleep018669-21python307:05:590
1983990456,28cyclictest9677-21hddtemp_smartct09:56:360
19839904516,22cyclictest0-21swapper11:18:110
19839904515,22cyclictest0-21swapper09:42:440
19839904515,21cyclictest0-21swapper09:19:450
19839904416,21cyclictest0-21swapper11:23:400
19839904414,23cyclictest0-21swapper10:49:550
1983990435,18cyclictest31006-21memory07:30:530
19839904320,15cyclictest0-21swapper12:32:220
19839904314,22cyclictest0-21swapper12:39:560
19839904311,24cyclictest25451-21load09:26:120
1983990424,18cyclictest27934-21sshd09:31:040
1983990423,28cyclictest13787-21diskstats09:05:310
19839904220,14cyclictest0-21swapper11:32:380
19839904217,17cyclictest13333-21df08:00:280
19839904215,20cyclictest18487-21df11:10:410
1983990416,27cyclictest25036-21/usr/sbin/munin07:21:210
1983990415,9cyclictest12237-21hddtemp_smartct10:00:530
1983990415,19cyclictest4401-21ssh11:43:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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