We have recently installed OpenBSD 6.2 onto the latest version of Microsoft's Hyper-V. It is all running smoothly with the exception of one aspect, namely timeouts - the latter are expiring in 1/2 their prescribed interval. The following script shows the issue:

# while 1
? sleep 1
? date
? end
Wed Feb 14 10:19:23 NZDT 2018
Wed Feb 14 10:19:24 NZDT 2018
Wed Feb 14 10:19:25 NZDT 2018
Wed Feb 14 10:19:25 NZDT 2018
Wed Feb 14 10:19:26 NZDT 2018
Wed Feb 14 10:19:26 NZDT 2018
Wed Feb 14 10:19:27 NZDT 2018
Wed Feb 14 10:19:28 NZDT 2018

The issue is also apparent with commands such as "vmstat 1" - this returns two reports per second as opposed to one.

We will investigate further next week with getitimer(2). A bug report is filed now however as various searches have failed to identify others with the same issue suggesting this late version of Hyper-V may be the underlying trigger.

Detail pertinent to the issue:

(a) OpenBSD dmesg (amd64 6.2):
OpenBSD 6.2 (GENERIC.MP) #134: Tue Oct  3 21:22:29 MDT 2017
real mem = 4278124544 (4079MB)
avail mem = 4141449216 (3949MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.3 @ 0xf8ec0 (216 entries)
bios0: vendor American Megatrends Inc. version "090006" date 04/28/2016
bios0: Microsoft Corporation Virtual Machine
acpi0 at bios0: rev 0
acpi0: sleep states S0 S5
acpi0: wakeup devices
acpitimer0 at acpi0: 3579545 Hz, 32 bits
acpihve0 at acpi0
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Xeon(R) Gold 5120 CPU @ 2.20GHz, 1709.96 MHz
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: smt 0, core 0, package 0
mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 114MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Xeon(R) Gold 5120 CPU @ 2.20GHz, 1253.22 MHz
cpu1: 256KB 64b/line 8-way L2 cache
cpu1: smt 0, core 1, package 0
ioapic0 at mainbus0: apid 0 pa 0xfec00000, version 11, 24 pins
, remapped to apid 0
acpiprt0 at acpi0: bus 0 (PCI0)
acpicpu0 at acpi0: C1(@1 halt!)
acpicpu1 at acpi0: C1(@1 halt!)
"PNP0F03" at acpi0 not configured
"PNP0700" at acpi0 not configured
"VMBus" at acpi0 not configured
"Hyper_V_Gen_Counter_V1" at acpi0 not configured
pvbus0 at mainbus0: Hyper-V 10.0
hyperv0 at pvbus0: protocol 3.0, features 0x2e7f
hyperv0: heartbeat, kvp, shutdown, timesync
hvs0 at hyperv0 channel 2: ide, protocol 6.2
scsibus1 at hvs0: 2 targets
sd0 at scsibus1 targ 0 lun 0: <Msft, Virtual Disk, 1.0> SCSI3 0/direct
fixed naa.60022480d06a442ed63ddfc772b7efe4
sd0: 1024MB, 512 bytes/sector, 2097152 sectors, thin
hvn0 at hyperv0 channel 14: NVS 5.0 NDIS 6.30, address 00:15:5d:53:2a:18
hvs1 at hyperv0 channel 15: scsi, protocol 6.2
scsibus2 at hvs1: 2 targets
sd1 at scsibus2 targ 0 lun 0: <Msft, Virtual Disk, 1.0> SCSI3 0/direct
fixed naa.600224805fb780b116ca1e1edad6094c
sd1: 61440MB, 512 bytes/sector, 125829120 sectors, thin
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel 82443BX" rev 0x03
pcib0 at pci0 dev 7 function 0 "Intel 82371AB PIIX4 ISA" rev 0x01
pciide0 at pci0 dev 7 function 1 "Intel 82371AB IDE" rev 0x01: DMA,
channel 0 wired to compatibility, channel 1 wired to compatibility
pciide0: channel 0 disabled (no drives)
atapiscsi0 at pciide0 channel 1 drive 0
scsibus3 at atapiscsi0: 2 targets
cd0 at scsibus3 targ 0 lun 0: <Msft, Virtual CD/ROM, 1.0> ATAPI 5/cdrom
cd0(pciide0:1:0): using PIO mode 4, DMA mode 2
piixpm0 at pci0 dev 7 function 3 "Intel 82371AB Power" rev 0x02: SMBus
vga1 at pci0 dev 8 function 0 "Microsoft VGA" rev 0x00
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
isa0 at pcib0
isadma0 at isa0
fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (b563e0fe1e12d3c0.a) swap on sd0b dump on sd0b
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec
fd1 at fdc0 drive 1: density unknown
acpi0: PM1 stuck (en 0x101 st 0x1), clearing

(b) Microsoft Hyper-V  -
This is running on Microsoft Windows Server 2016 Hyper-V.
Microsoft Windows Server 2016
Version 1607 (OS Build 14393.693)

(c) The ntpd config (not that is should be relevant).
# $OpenBSD: ntpd.conf,v 1.14 2015/07/15 20:28:37 ajacoutot Exp $
# See ntpd.conf(5) and /etc/examples/ntpd.conf

#servers pool.ntp.org
#sensor *
sensor hyperv0
constraints from "https://www.google.com";

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