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2026-05-17 - 01:29

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 all highest latencies:
System rackfslot4s.osadl.org (updated Sat May 16, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1298122550,2sleep012982-21cat07:10:030
266921220,3chrt632-21/usr/sbin/munin11:52:250
1657921220,3chrt16459-21apt-get07:15:320
2212721210,2chrt22129-21ps09:56:020
2470221180,2chrt24703-21chrt08:20:020
1508221180,3chrt15083-21ls08:55:480
1422621180,3chrt14227-21sleep11:21:080
3176221170,2chrt31763-21sleep09:21:570
1594621170,2sleep015947-21fschecks_count08:05:360
2942621160,1sleep029429-21fschecks_time10:55:520
1852421160,1sleep018530-21/usr/sbin/munin11:27:250
1208821160,1sleep012086-21apt10:30:120
2579521140,1sleep025800-21chrt09:13:040
2483121140,2chrt24832-21runrttasks08:20:080
1028921140,2sleep010288-21seq09:38:210
1896821100,2chrt18966-21ls09:51:410
662021090,1sleep06619-21seq11:58:570
1767621090,2sleep017677-21runrttasks10:37:590
3065221080,2sleep030653-21runrttasks10:09:010
3240621070,2sleep032409-21chrt07:40:320
3150521070,2chrt31506-21sleep07:39:120
188721050,2chrt1888-21ssh11:02:430
303021000,1sleep03033-21cut10:16:040
62642990,2sleep06267-21grep08:41:240
208032990,2sleep020805-21cut12:20:340
33062910,2sleep03307-21runrttasks09:27:300
134862870,2sleep013484-21diskstats07:10:310
271392850,2sleep027140-21chrt12:30:060
90352840,1sleep09037-21cut10:25:330
27512830,3chrt2735-21ntpq08:35:530
80282800,2sleep08032-21missed_timers11:12:040
34532790,2sleep03455-21rm11:05:390
132842780,2sleep013282-21if_can008:01:310
12988907616,52cyclictest28707-21sendmail_mailtr09:17:210
8152750,2sleep0816-21seq12:39:120
325202750,2sleep032521-21seq11:49:080
171852750,1sleep017186-21seq09:48:560
1298890756,10cyclictest19761-21perl10:41:290
1298890754,62cyclictest7315-21runrttasks12:02:500
1298890736,58cyclictest9859-21ssh11:15:180
1298890736,58cyclictest12222-21runrttasks12:07:030
1298890736,11cyclictest11659-21diskstats09:40:480
1298890735,58cyclictest23911-21sh10:47:100
1298890727,12cyclictest32388-21memory10:11:100
1298890726,9cyclictest22505-21munin-run07:25:010
1298890726,9cyclictest18611-21ntpq09:01:210
1298890726,56cyclictest25782-21/usr/sbin/munin07:30:250
1298890725,57cyclictest8974-21ntpq08:45:520
1298890716,56cyclictest23601-21diskstats11:35:480
1298890715,57cyclictest7646-21ssh09:35:000
1298890715,57cyclictest20447-21hddtemp_smartct11:30:550
1298890714,47cyclictest18748-21ntp_states12:16:500
1298890714,10cyclictest27300-21seq12:30:290
1298890714,10cyclictest27093-21perl11:40:530
12988907114,45cyclictest31056-21/usr/sbin/munin08:30:410
12988907110,51cyclictest25582-21cron07:29:590
1298890706,10cyclictest6204-21aten2.4_rfpower07:50:270
1298890705,9cyclictest25363-21/usr/sbin/munin10:01:010
1298890705,53cyclictest9078-21apt-get07:55:180
1298890705,10cyclictest26794-21ntpq10:51:220
1298890705,10cyclictest13912-21apt-get12:10:200
1298890704,10cyclictest4475-21kworker/u2:307:47:070
1298890696,54cyclictest12074-21collect208:50:520
1298890695,12cyclictest5889-21df_inode10:20:410
1298890686,53cyclictest20734-21sh09:05:330
1298890686,11cyclictest18628-21apt-get08:10:140
1298890685,11cyclictest27965-21apt-get08:25:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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