high CPU stolen time after live migrate

high CPU stolen time after live migrate

[Olivier Bonvalet]

Hi,

with Xen 4.8.2, migrated domains have wrong stats for stolen time.

For example :

root! laussor:/proc# cat stat 
cpu  87957976 32463 6483874 361169794 3075806 0 937004 183086986113 0 0
cpu0 2828867 2434 226580 43754152 786651 0 42766 1778722573131 0 0
cpu1 2611496 3545 232529 42364047 594846 0 2441 1598822754769 0 0
cpu2 21958330 14923 1338283 40315990 424045 0 127421 1086605305497 0 0
cpu3 2725745 339 271471 42426113 319132 0 1408 41756798508 0 0
cpu4 21738600 3858 1099222 39528759 508996 0 682044 321900840424 0 0
cpu5 9543155 1668 1165194 53274011 231727 0 8130 1652751948052 0 0
cpu6 14223984 4014 970888 48826880 126790 0 67909 254194505219 0 0
cpu7 12327794 1680 1179702 50679764 83618 0 4883 827029885923 0 0
intr 7866132625 99868037 0 434116966 617 0 363800 0 94983174 425603035 1016 0 390335 0 0 122245733 369053953 1041 0 358301 0 0 77267482 422334777 1015 0 371084 0 0 96031342 218747945 993 0 331440 0 0 77622794 333046334 1139 0 444912 0 0 57536561 237035283 1126 0 407725 0 0 41162673 306795645 1196 0 431960 0 0 775 0 0 0 0 479 0 0 0 952 0 0 0 17046 30405 15526 94781 14025 3849 16848 4485 16352 1801 17611 2104 14016 1807 16868 2235 3680 0 0 0 0 0 0 0 110370 107659 101208 355716 107895 62726 105345 70387 112823 62653 103888 70642 109312 63799 103388 65918 0 0 0 5619 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ctxt 6178259009
btime 1506309567
processes 6457002
procs_running 2
procs_blocked 0
softirq 2893820956 8 574619811 808518311 848843354 0 0 12041195 205459383 0 444338894


root! laussor:/proc# cat /proc/uptime 
652005.23 2631328.82


Values for "stolen time" in /proc/stat seems impossible with only 7 days of uptime.


Is it a known bug ?

thanks,

Olivier

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Re: high CPU stolen time after live migrate

[Dario Faggioli]

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On Mon, 2017-10-02 at 18:37 +0200, Olivier Bonvalet wrote:
> root! laussor:/proc# cat /proc/uptime 
> 652005.23 2631328.82
> 
> 
> Values for "stolen time" in /proc/stat seems impossible with only 7
> days of uptime.
> 
I think it can be this:
https://0xstubs.org/debugging-a-flaky-cpu-steal-time-counter-on-a-parav
irtualized-xen-guest/

What's the version of your guest kernel?

Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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Re : high CPU stolen time after live migrate

[Olivier Bonvalet]

Le mardi 03 octobre 2017 à 11:22 +0200, Dario Faggioli a écrit :
> What's the version of your guest kernel?

4.9.52, so yes, it seems to be that, I will try to patch and follow
this issue.

Thanks !

Olivier

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