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2026-05-19 - 15:55

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 highest latencies:
System rackfslot4s.osadl.org (updated Tue May 19, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1782921260,2chrt17830-21chrt11:30:580
2358121190,2chrt23580-21/usr/sbin/munin07:30:340
1553721190,3chrt15539-21runrttasks11:27:100
2767621170,2chrt27674-21ssh12:35:000
2358021170,2sleep023587-21seq09:14:000
3258321160,2sleep032584-21chrt07:45:210
2780021160,3chrt27802-21sleep09:20:320
1262321160,1sleep012624-21if_err_eth109:46:040
1564921150,2chrt15648-21seq08:10:210
1383121150,3chrt13832-21chrt07:15:410
116621150,3chrt1170-21fschecks_time11:05:540
1138621150,4chrt11382-21ssh12:10:290
981721140,3chrt9818-21fschecks_count08:00:360
533621140,3chrt5338-21if_can012:01:000
345821130,2chrt3459-21seq09:32:060
539221120,2chrt5391-21modprobe09:35:340
2610221120,2sleep026101-21seq08:26:050
2410621120,1sleep024105-21seq12:29:280
40021110,1sleep0463-21seq11:05:040
2946721110,3chrt29466-21apt-config11:00:080
2698721110,2chrt26991-21wc10:07:180
2806321100,2chrt28064-21seq08:30:180
1486921100,2chrt14870-21/usr/sbin/munin12:15:350
129221100,2sleep01293-21seq09:29:160
613021090,3chrt6131-21sleep10:25:110
2059321070,3chrt20594-21runrttasks09:57:310
1028821060,2chrt10289-21sleep08:52:400
766521050,2chrt7668-21sleep07:56:250
1436821020,2chrt14369-21sleep08:07:070
243262950,1sleep024327-21seq10:51:470
114612920,2sleep011463-21cut11:21:040
14702900,2sleep01473-21wc10:17:280
104822890,2sleep010486-21sed10:31:060
223302830,1sleep022331-21seq10:49:150
181312800,2sleep018132-21seq09:05:330
182732790,2sleep018274-21seq09:54:540
6142760,2sleep0615-21seq11:53:510
274242760,2sleep027425-21seq07:36:000
264842750,2sleep026485-21chrt11:43:570
217092750,1sleep021710-21chrt07:26:290
139852730,2sleep013986-21rm10:36:170
38372680,2sleep03838-21cat07:50:420
248592660,2sleep024861-21sort08:25:030
263932620,1sleep026394-21chrt09:17:440
222852604,46sleep022288-21df10:00:390
293472580,1sleep029348-21if_eth010:11:040
150542573,9sleep015112-21fschecks_time09:00:370
196732564,8sleep019675-21memory08:15:500
297342552,46sleep029725-21ssh12:37:220
283912553,8sleep028383-21ssh11:46:240
214202550,2sleep021423-21cut11:36:040
315022533,8sleep031541-21seq08:35:350
45272524,8sleep04448-21ntp_states10:22:170
35442524,7sleep03552-21ld08:42:000
10200905221,22cyclictest0-21swapper12:09:180
825425113,21sleep08257-21ntpq07:05:460
44772490,3chrt4478-21modprobe12:00:020
131422484,37sleep013144-21ntp_states08:57:090
10200904818,22cyclictest0-21swapper11:10:110
73042472,7sleep07309-21ssh11:15:310
305452473,36sleep030558-21ntpq07:41:000
193002460,3chrt19291-21ssh10:44:580
180172463,35sleep018182-21sed07:21:360
10200904616,22cyclictest0-21swapper12:22:320
10200904214,22cyclictest10055-21ntp_states09:41:560
1020090414,19cyclictest13260-21munin-run07:15:040
10200903915,8cyclictest6290-21ntpq08:46:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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