host, bhyve vm and ntpd

Hi All,

I have got a host:
---
bhyve-host% uname -a
FreeBSD sm.bsnet 12.0-CURRENT FreeBSD 12.0-CURRENT #3 r322868: Fri Aug
25 05:25:26 MSK 2017
bsam_at_builder.bsnet:/usr/obj/usr/src/sys/GENERIC-FAST  amd64 amd64
---

And a bhyve vm:
---
bhyve-vm: uname -a
FreeBSD builder.bsnet 12.0-CURRENT FreeBSD 12.0-CURRENT #58 r324782: Fri
Oct 20 05:12:17 MSK 2017
bsam_at_builder.bsnet:/usr/obj/usr/src/sys/PKG64X  amd64 amd64
---

The only difference at kernel configs is a colored console. :-)

And here I get some weird (is it?) result at the VM (I expect ntpd to be
more stable):
---
bhyve-vm% for t in `jot 10`; do ntpq -pn; sleep 64; done
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 XX.XX.XX.1      XX.XX.XX.245     4 u    9   64    3    0.605   -1.202
316.407
 XX.XX.XX.1      XX.XX.XX.245     4 u    7   64    7    0.605   -1.202
358.395
*XX.XX.XX.1      XX.XX.XX.245     4 u    5   64   17    0.615  -328.42
181.405
*XX.XX.XX.1      XX.XX.XX.245     4 u    3   64   37    0.615  -328.42
214.868
*XX.XX.XX.1      XX.XX.XX.245     4 u   67   64   37    0.615  -328.42
214.868
*XX.XX.XX.1      XX.XX.XX.245     4 u   63   64   77    0.615  -328.42
268.618
*XX.XX.XX.1      XX.XX.XX.245     4 u   60   64  177    0.615  -328.42
333.175
 XX.XX.XX.1      .STEP.          16 u 1910   64    0    0.000    0.000
0.000
 XX.XX.XX.1      XX.XX.XX.245     4 u   27   64    1    0.703  -262.63
0.004
 XX.XX.XX.1      XX.XX.XX.245     4 u   31   64    1    0.649  -331.43
68.800
---

At the same time host's results are very stable:
---
bhyve-host% for t in `jot 10`; do ntpq -pn; sleep 64; done
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================



*XX.XX.XX.1      XX.XX.XX.245     4 u    1   64    1    0.401    0.176
0.106
*XX.XX.XX.1      XX.XX.XX.245     4 u    6   64    3    0.401    0.176
0.459
*XX.XX.XX.1      XX.XX.XX.245     4 u    3   64    7    0.401    0.176
0.940
*XX.XX.XX.1      XX.XX.XX.245     4 u   67   64    7    0.401    0.176
0.940
*XX.XX.XX.1      XX.XX.XX.245     4 u   64   64   17    0.401    0.176
1.566
*XX.XX.XX.1      XX.XX.XX.245     4 u   60   64   37    0.448    1.275
1.739
*XX.XX.XX.1      XX.XX.XX.245     4 u   55   64   77    0.448    1.275
2.365
*XX.XX.XX.1      XX.XX.XX.245     4 u   53   64  177    0.448    1.275
3.110
*XX.XX.XX.1      XX.XX.XX.245     4 u   50   64  377    0.448    1.275
3.929
*XX.XX.XX.1      XX.XX.XX.245     4 u   45   64  377    0.443    8.750
4.722
---

The network is organized via bridge -- host igb and vm tap interfaces
are members of one bridge.

Are those results expected? Does it smell like a bug? Should I dig
furter?

-- 
WBR, Boris Samorodov (bsam)
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve