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2026-05-21 - 18:19

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 Thu May 21, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2975521210,3chrt29749-21ntpq10:36:430
1170021200,3chrt11692-21ntpq11:46:420
804421190,2chrt8045-21modprobe10:04:590
3039021190,3chrt30388-21python307:16:270
42921150,3chrt430-21ntpq10:41:170
1734321150,2chrt17342-21http08:40:040
3197221140,2sleep031973-21chrt11:28:370
1029121120,2chrt10292-21sleep09:19:480
796621110,2sleep07967-21aten2.4-expect12:30:320
393021110,2sleep03931-21chrt09:10:170
2800421100,3chrt28005-21runrttasks11:22:190
1542821090,3chrt15429-21sh10:15:510
1058221080,2chrt10583-21sleep08:28:400
2134821070,3chrt21349-21ssh10:24:490
511721060,1sleep05118-21seq07:28:090
1534821060,2chrt15346-21/usr/sbin/munin11:52:140
1341421050,2sleep013416-21chrt12:38:020
2223521040,3chrt22236-21sh11:14:130
1429821030,2chrt14299-21sh10:14:010
3165821020,2sleep031661-21cut12:16:530
310921020,4chrt3110-21sh09:08:240
455721010,1sleep04558-21seq10:47:370
3082421010,2chrt30825-21sleep08:09:550
57682980,2sleep05769-21chrt11:37:420
300732980,2sleep030076-21sort09:00:040
173552980,2chrt17356-21sh07:47:360
113122950,1sleep011314-21chrt10:09:500
278682920,2sleep027869-21cut08:05:030
246592920,2sleep024660-21sh09:40:590
169792880,2sleep016980-21chrt11:55:280
185712850,2sleep018574-21tail07:50:240
29812790,2sleep02984-21wc12:22:140
208312790,1sleep020833-21grep12:00:520
156252760,2sleep015626-21seq09:27:100
228422750,2sleep022843-21seq09:37:510
70422730,1sleep07043-21rm11:40:250
304532730,2sleep030485-21grep09:50:010
237762730,1sleep023779-21irqrtprio11:16:050
171672710,2sleep017165-21if_err_can011:06:440
125432710,1sleep012544-21chrt08:31:150
22552680,3sleep02256-21seq07:24:260
30442650,2sleep03043-21seq09:56:480
228922650,1sleep022893-21chrt10:26:220
115702590,2sleep011573-21cut09:21:080
74072544,9sleep0439-21sh08:23:280
12352540,2sleep01238-21sed11:31:040
25637905219,24cyclictest0-21swapper12:05:580
133742520,2sleep013375-21gcc07:41:040
62982513,7sleep06305-21/usr/sbin/munin07:30:280
113642510,2chrt11282-21ssh10:57:250
25637904920,22cyclictest0-21swapper10:53:300
322132483,7sleep032210-21ntpq09:51:550
2555524712,20sleep025593-21munin-run07:10:010
76442460,2sleep07645-21chrt12:30:010
301432460,2sleep030144-21chrt09:00:130
2563790455,17cyclictest9056-21apt-get07:35:180
15532450,3sleep01554-21chrt08:15:030
287192440,2chrt28718-21seq07:15:010
250212440,3chrt25022-21sh10:30:180
25637904314,20cyclictest0-21swapper09:34:480
298702423,32sleep029865-21ssh12:14:500
2563790424,11cyclictest22538-21ntpq07:55:530
2563790414,11cyclictest22003-21ntpq08:46:090
137692410,3chrt13768-21grep11:01:100
25637904015,8cyclictest1933-21apt-get08:16:000
25637904015,18cyclictest24225-21df08:50:290
25637903915,16cyclictest17287-21apt-get08:40:340
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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