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2026-03-10 - 16:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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 100 highest latencies:
System rackeslot4s.osadl.org (updated Tue Mar 10, 2026 12:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1187495994134,5cyclictest1275574-21latency_hist08:35:001
1187502994034,4cyclictest1328411-21latency_hist09:25:003
1187502993330,2cyclictest1197542-21kworker/u8:1+flush-259:008:00:013
1187502993330,2cyclictest1197542-21kworker/u8:1+flush-259:008:00:003
1187502993225,5cyclictest1420454-21ntpq10:50:183
1187495993225,5cyclictest252-21systemd-journal09:49:591
1187495993127,3cyclictest1473388-21kworker/u8:3+flush-259:012:14:591
1187492993125,4cyclictest252-21systemd-journal10:06:190
1187500993027,2cyclictest1260207-21kworker/u8:3+flush-259:008:30:002
1187495993025,3cyclictest1353996-21kworker/u8:2+flush-259:010:15:141
1187495993025,3cyclictest1353996-21kworker/u8:2+flush-259:010:15:141
1187500992721,4cyclictest252-21systemd-journal11:33:172
1187500992720,5cyclictest1260608-21diskstats08:20:132
1187495992722,3cyclictest1224359-21/usr/sbin/munin07:45:141
1187492992723,3cyclictest1343854-21kworker/u8:3+flush-259:010:00:260
1187492992722,4cyclictest1322833-21apt-get09:20:030
1187500992622,2cyclictest0-21swapper/209:20:002
1187500992522,2cyclictest1353996-21kworker/u8:2+flush-259:011:15:192
1187495992522,2cyclictest1254967-21kworker/u8:1+flush-259:008:55:211
1187492992521,3cyclictest1279763-21kworker/u8:2+events_unbound08:50:000
1187502992420,3cyclictest1473388-21kworker/u8:3+flush-259:012:10:003
1187500992420,3cyclictest1306942-21kworker/u8:0+flush-259:009:15:012
1187495992417,5cyclictest252-21systemd-journal10:45:001
1187500992319,2cyclictest1353996-21kworker/u8:2+flush-259:011:25:012
1187500992317,4cyclictest1405861-21latency_hist10:40:002
1187495992318,3cyclictest1353996-21kworker/u8:2+flush-259:012:05:181
1187492992317,4cyclictest1333555-21latency_hist09:30:000
1187492992316,5cyclictest1224331-21cp07:45:000
1187500992218,3cyclictest1353996-21kworker/u8:2+events_unbound12:07:182
1187500992218,3cyclictest1254967-21kworker/u8:1+flush-259:009:45:002
1187500992217,3cyclictest1473388-21kworker/u8:3+events_unbound11:45:182
1187492992218,3cyclictest1395539-21kworker/u8:3+flush-259:010:50:000
1187492992217,4cyclictest1254141-21ntpq08:10:210
1187492992216,4cyclictest252-21systemd-journal12:16:180
1187502992117,3cyclictest1244934-21kworker/u8:3+flush-259:008:05:263
1187502992115,4cyclictest1312791-21apt-get09:10:113
1187500992118,2cyclictest1380032-21kworker/u8:5+events_unbound10:15:192
1187500992118,2cyclictest1380032-21kworker/u8:5+events_unbound10:15:182
1187500992118,2cyclictest1279763-21kworker/u8:2+flush-259:008:38:482
1187500992116,3cyclictest1446915-21kworker/u8:1+events_unbound11:50:162
1187500992114,4cyclictest1494011-21latency_hist12:05:002
1187495992117,3cyclictest1223814-21gpgv07:45:011
1187495992117,3cyclictest1223814-21gpgv07:45:001
1187492992118,2cyclictest1234458-21kworker/u8:2+events_unbound08:00:000
1187492992118,2cyclictest1234458-21kworker/u8:2+events_unbound08:00:000
1187492992116,3cyclictest1473388-21kworker/u8:3+events_unbound11:50:000
1187502992014,5cyclictest252-21systemd-journal08:15:003
1187500992016,3cyclictest1509507-21kworker/u8:0+flush-259:012:25:172
1187500992016,3cyclictest1380031-21kworker/u8:0+events_unbound10:20:192
1187500992015,3cyclictest1519982-21/usr/sbin/munin12:30:232
1187500992015,3cyclictest1519982-21/usr/sbin/munin12:30:232
1187500992014,4cyclictest1359295-21latency_hist09:55:012
1187500992011,6cyclictest252-21systemd-journal07:45:002
1187500992011,6cyclictest252-21systemd-journal07:44:592
1187495992017,2cyclictest1307181-21apt-get09:05:111
1187495992014,4cyclictest1323046-21cat09:20:001
1187495992014,4cyclictest1284953-21ntpq08:40:201
1187492992017,2cyclictest1380032-21kworker/u8:5+events_unbound10:35:000
1187492992016,3cyclictest1494238-21kworker/u8:4+events_unbound12:15:000
1187492992016,3cyclictest1431905-21kworker/u8:0+events_unbound12:00:170
1187492992016,3cyclictest1380032-21kworker/u8:5+flush-259:010:45:010
1187502991916,1cyclictest0-21swapper/309:45:003
1187502991915,3cyclictest1317927-21apt-get09:15:103
1187502991915,3cyclictest1279763-21kworker/u8:2+flush-259:009:05:013
1187502991914,4cyclictest1254967-21kworker/u8:1+flush-259:008:55:193
1187500991917,1cyclictest0-21swapper/209:24:592
1187500991915,3cyclictest1306942-21kworker/u8:0+events_unbound09:26:202
1187500991915,3cyclictest1254967-21kworker/u8:1+flush-259:009:30:202
1187500991915,3cyclictest1197542-21kworker/u8:1+events_unbound07:25:182
1187500991915,2cyclictest1255019-21sh08:15:002
1187500991912,5cyclictest252-21systemd-journal10:35:012
1187500991912,5cyclictest1514630-21latency_hist12:25:012
1187495991916,2cyclictest509-21rs:main1
1187495991915,3cyclictest2971-21cron10:14:591
1187495991915,3cyclictest1187702-21apt-get07:10:111
1187495991915,2cyclictest0-21swapper/111:15:011
1187495991913,4cyclictest1254967-21kworker/u8:1+flush-259:009:40:171
1187492991916,2cyclictest1369869-21kworker/u8:1+flush-259:010:14:590
1187492991916,2cyclictest1364477-21kworker/u8:4+flush-259:010:55:260
1187492991915,3cyclictest1380031-21kworker/u8:0+events_unbound10:20:130
1187500991815,2cyclictest1353996-21kworker/u8:2+events_unbound11:45:002
1187500991815,2cyclictest1279763-21kworker/u8:2+flush-259:009:00:242
1187500991814,3cyclictest1254967-21kworker/u8:1+events_unbound08:40:132
1187492991814,3cyclictest1380032-21kworker/u8:5+events_unbound10:15:210
1187492991814,3cyclictest1380032-21kworker/u8:5+events_unbound10:15:200
1187492991813,3cyclictest252-21systemd-journal11:24:130
1187492991812,4cyclictest252-21systemd-journal08:58:510
1187502991714,2cyclictest1307603-21irqcore09:05:153
1187502991714,2cyclictest1306942-21kworker/u8:0+flush-259:009:30:003
1187502991714,2cyclictest0-21swapper/311:49:593
1187500991714,2cyclictest1353996-21kworker/u8:2+flush-259:010:55:002
1187500991714,2cyclictest1343854-21kworker/u8:3+flush-259:010:00:192
1187500991714,2cyclictest1343834-21sh09:40:002
1187500991713,3cyclictest1473388-21kworker/u8:3+events_unbound12:14:222
1187500991713,3cyclictest1431905-21kworker/u8:0+flush-259:011:40:012
1187500991713,3cyclictest1369869-21kworker/u8:1+events_unbound10:10:162
1187500991713,3cyclictest1254967-21kworker/u8:1+events_unbound08:30:182
1187500991713,3cyclictest1182340-21kworker/u8:0+events_unbound07:10:212
1187495991714,1cyclictest0-21swapper/111:59:591
1187495991711,4cyclictest1415288-21ntpq10:45:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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