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2026-04-25 - 00:12

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 50 highest latencies:
System rack4slot6s.osadl.org (updated Fri Apr 24, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2084922600,2sleep020852-21mailstats08:15:260
1031222470,3sleep010311-21sort07:35:180
2151722440,2sleep021516-21awk12:30:150
391822420,3sleep03916-21ntpq07:10:180
1779321160,2sleep017792-21if_eth010:10:130
836821140,3chrt8369-21latency_hist11:40:010
978121070,3sleep09812-21kworker/u2:209:40:010
262621060,2sleep02627-21mailstats09:10:250
1455021060,3chrt14552-21uptime07:50:270
1352521030,4sleep013594-21cut12:00:030
10282960,3sleep01038-21latency09:05:170
96542910,3sleep09655-21latency_hist11:45:010
203932910,3sleep020437-21ps12:25:240
28182900,5sleep02889-21/usr/sbin/munin07:05:250
318872880,4sleep031935-21grep11:05:110
67362870,2sleep06811-21sed07:20:280
190312840,3sleep019074-21if_eth010:15:130
115222840,3sleep011553-21/usr/sbin/munin09:45:230
103632810,3sleep010429-21grep09:40:260
140882750,2sleep014087-21ntpq09:55:210
3540996610,29cyclictest6069-21/usr/sbin/munin09:25:260
319222660,3sleep031923-21modprobe09:00:010
3540996526,14cyclictest24004-21latency_hist10:35:010
3540996240,14cyclictest20394-21latency_hist08:15:020
3540996232,19cyclictest32551-21/usr/sbin/munin09:00:260
158642623,5sleep00-21swapper07:55:330
3540996130,21cyclictest16029-21runrttasks12:09:370
354099608,18cyclictest21735-21/usr/sbin/munin08:20:260
354099599,17cyclictest13633-21/usr/sbin/munin12:00:270
354099599,16cyclictest25297-21munin-run10:40:010
354099599,15cyclictest20279-21/usr/sbin/munin10:20:210
3540995934,16cyclictest16486-21/usr/sbin/munin12:10:210
3540995931,18cyclictest28211-21/usr/sbin/munin10:50:180
3540995917,11cyclictest24567-21ntp_kernel_pll_08:30:180
354099588,15cyclictest16562-21/usr/sbin/munin08:00:280
3540995834,16cyclictest18997-21/usr/sbin/munin12:20:170
3540995834,16cyclictest18322-21/usr/sbin/munin08:05:270
3540995834,15cyclictest13005-21/usr/sbin/munin09:50:260
3540995833,15cyclictest4980-21/usr/sbin/munin07:15:130
3540995833,15cyclictest23347-21/usr/sbin/munin08:25:240
354099577,16cyclictest3460-21/usr/sbin/munin09:15:260
354099577,16cyclictest30473-21tr11:00:010
354099576,17cyclictest11042-21/usr/sbin/munin11:50:260
3540995734,15cyclictest29364-21latency_hist08:50:010
3540995733,15cyclictest2042-21/usr/sbin/munin11:15:110
3540995733,15cyclictest12959-21/usr/sbin/munin07:45:190
3540995732,17cyclictest7866-21/usr/sbin/munin09:30:260
3540995731,16cyclictest5620-21runrttasks11:28:560
3540995724,19cyclictest0-21swapper11:00:100
229582573,5sleep00-21swapper12:35:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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