I already tried disabling Hyper-v time syncing, setting
kern.timecounter.hardware to different type from
kern.timecounter.choice, setting kern.hz to different values. But
nothing helped.
I'll try to install CentOS 6.4 on this machine and see what happens.

2013/11/6 Pavel Timofeev <tim...@gmail.com>:
> Does anybody know how to disable Hyper-v time syncing it guest FreeBSD
> OS? I'd like to try this one.
>
> 2013/11/6 Pavel Timofeev <tim...@gmail.com>:
>> Thank you very much!
>> I started to dig, and found that I can reboot my server running under
>> Hyper-V by doing 'sysctl -a'.
>> Can anybody confirm same behavoiur?
>>
>> FreeBSD 10.0-BETA3, Win 2012 Datacenter
>>
>> 2013/11/5 Julian Elischer <jul...@freebsd.org>:
>>> On 11/4/13, 11:13 PM, Pavel Timofeev wrote:
>>>>
>>>> Hi! I upgraded to 10.0-BETA3 but still see messages like
>>>>
>>>> Tue Nov  5 11:09:05 MSK 2013
>>>> calcru: runtime went backwards from 1728 usec to 889 usec for pid 981
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1229 usec to 703 usec for pid 976
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1019 usec to 595 usec for pid 978
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 3041 usec to 1611 usec for pid 969
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1078 usec to 595 usec for pid 975
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1114 usec to 617 usec for pid 980
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1086 usec to 602 usec for pid 977
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1195 usec to 782 usec for pid 970
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 3206 usec to 2157 usec for pid 979
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 2179 usec to 1542 usec for pid 972
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 1833 usec to 927 usec for pid 1026
>>>> (cron)
>>>> calcru: runtime went backwards from 1091 usec to 551 usec for pid 1022
>>>> (sendmail)
>>>> calcru: runtime went backwards from 823 usec to 416 usec for pid 1022
>>>> (sendmail)
>>>> calcru: runtime went backwards from 4691 usec to 2735 usec for pid
>>>> 1011 (sendmail)
>>>> calcru: runtime went backwards from 1162 usec to 587 usec for pid 1011
>>>> (sendmail)
>>>> calcru: runtime went backwards from 947 usec to 478 usec for pid 1010
>>>> (httpd)
>>>> calcru: runtime went backwards from 895 usec to 452 usec for pid 1009
>>>> (httpd)
>>>> calcru: runtime went backwards from 954 usec to 482 usec for pid 1008
>>>> (httpd)
>>>> calcru: runtime went backwards from 909 usec to 459 usec for pid 1007
>>>> (httpd)
>>>> calcru: runtime went backwards from 1214 usec to 653 usec for pid 1006
>>>> (httpd)
>>>> calcru: runtime went backwards from 201793 usec to 102672 usec for pid
>>>> 996 (httpd)
>>>> calcru: runtime went backwards from 1105 usec to 1064 usec for pid 991
>>>> (sshd)
>>>> calcru: runtime went backwards from 45196 usec to 23221 usec for pid
>>>> 974 (zabbix_server)
>>>> calcru: runtime went backwards from 2192 usec to 1436 usec for pid 973
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 605 usec to 306 usec for pid 968
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 626 usec to 316 usec for pid 967
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 773 usec to 391 usec for pid 966
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 663 usec to 335 usec for pid 965
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 799 usec to 404 usec for pid 964
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 37723 usec to 19422 usec for pid
>>>> 963 (zabbix_server)
>>>> calcru: runtime went backwards from 49425 usec to 26265 usec for pid
>>>> 962 (zabbix_server)
>>>> calcru: runtime went backwards from 38883 usec to 20993 usec for pid
>>>> 961 (zabbix_server)
>>>> calcru: runtime went backwards from 53478 usec to 27411 usec for pid
>>>> 960 (zabbix_server)
>>>> calcru: runtime went backwards from 40845 usec to 21750 usec for pid
>>>> 959 (zabbix_server)
>>>> calcru: runtime went backwards from 47835 usec to 24455 usec for pid
>>>> 958 (zabbix_server)
>>>> calcru: runtime went backwards from 2257 usec to 1612 usec for pid 957
>>>> (zabbix_server)
>>>> calcru: runtime went backwards from 2361 usec to 1193 usec for pid 932
>>>> (zabbix_agentd)
>>>> calcru: runtime went backwards from 32053 usec to 16204 usec for pid
>>>> 928 (zabbix_server)
>>>> calcru: runtime went backwards from 32517 usec to 19280 usec for pid 697
>>>> (sh)
>>>> calcru: runtime went backwards from 1128021 usec to 868022 usec for pid
>>>> 697 (sh)
>>>> calcru: runtime went backwards from 9609 usec to 5601 usec for pid 601
>>>> (syslogd)
>>>> calcru: runtime went backwards from 688 usec to 348 usec for pid 106
>>>> (adjkerntz)
>>>> calcru: runtime went backwards from 12 usec to 6 usec for pid 3
>>>> (sctp_iterator)
>>>> calcru: runtime went backwards from 5467 usec to 2853 usec for pid 2
>>>> (fdc0)
>>>> calcru: runtime went backwards from 11306 usec to 8408 usec for pid 14
>>>> (rand_harvestq)
>>>> calcru: runtime went backwards from 136242 usec to 76230 usec for pid 13
>>>> (geom)
>>>> calcru: runtime went backwards from 156117 usec to 118882 usec for pid 12
>>>> (intr)
>>>> calcru: runtime went backwards from 7820 usec to 4847 usec for pid 1
>>>> (init)
>>>> calcru: runtime went backwards from 2340313 usec to 1226503 usec for
>>>> pid 1 (init)
>>>> calcru: runtime went backwards from 4114 usec to 2164 usec for pid 0
>>>> (kernel)
>>>>
>>>>
>>>> Is it bad? Or I have to ignore them?
>>>
>>>
>>> I'm not talking authoratatively but in some virtualization systems, if the
>>> TSCs on the various processors are not sufficiently synchronized, then when
>>> the hypervisor switches you from one CPU to another, you can get odd
>>> (sometimes negative) time readings which give messages like this..
>>>
>>>> _______________________________________________
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>>>> http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
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>>>>
>>>>
>>>
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