I have this problem with Ubuntu 18.04
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https://bugs.launchpad.net/bugs/1086782
Title:
HPET time drift windows 7 64bits guest
Status in QEMU:
Expired
Bug description:
Using latest qemu-kvm (1.2.0), time drift (clock slow in guest) in Windows 7
64 bits guest when HPET is enabled (default).
Disabling HPET (-no-hpet) solves the time drift.
UsePlatformClock enable/disable doesn't make a difference in the guest.
bcdedit /set useplatformclock true
Using driftfix slew doesn't make a difference too.
# qemu-system-x86_64 --version
QEMU emulator version 1.2.0 (qemu-kvm-1.2.0), Copyright (c) 2003-2008 Fabrice
Bellard
Kernel is 3.6.8:
# uname -a
Linux pulsar 3.6.8 #1 SMP Sat Dec 1 16:26:10 CET 2012 x86_64 x86_64 x86_64
GNU/Linux
TSC is stable in the host:
===
# cat /sys/devices/system/clocksource/clocksource0/current_clocksource
tsc
Dmesg:
[ 0.000000] hpet clockevent registered
[ 0.000000] tsc: Fast TSC calibration using PIT
[ 0.000000] tsc: Detected 2660.096 MHz processor
[ 0.001002] Calibrating delay loop (skipped), value calculated using timer
frequency.. 5320.19 BogoMIPS (lpj=2660096)
[ 0.001138] pid_max: default: 32768 minimum: 301
...
[ 1.492019] tsc: Refined TSC clocksource calibration: 2659.973 MHz
[ 1.492093] Switching to clocksource tsc
CPUinfo, constant_tsc:
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Core(TM)2 Quad CPU Q8400 @ 2.66GHz
stepping : 10
microcode : 0xa0b
cpu MHz : 2667.000
cache size : 2048 KB
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm
constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor
ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 xsave lahf_lm dtherm tpr_shadow
vnmi flexpriority
bogomips : 5320.19
# grep -i hpet .config
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_HPET=y
# CONFIG_HPET_MMAP is not set
===
Qemu command line:
/usr/bin/qemu-system-x86_64 -drive
file=/dev/vol0/KVMORION01,cache=none,aio=native,if=virtio \
-drive file=/dev/vol0/KVMORION02,cache=none,aio=native,if=virtio \
-cpu host \
-m 2048 \
-smp 4,maxcpus=4,cores=4,threads=1,sockets=1 \
-rtc base=localtime,driftfix=slew \
-vnc 10.124.241.211:0,password -k es \
-monitor telnet:localhost:37200,server,nowait \
-netdev
tap,id=kvmorion,ifname=kvmorion,script=/etc/qemu-ifup-br0,downscript=/etc/qemu-ifdown-br0
\
-device virtio-net-pci,netdev=kvmorion,id=virtio-nic0,mac=02:85:64:02:c2:aa
\
-device virtio-balloon-pci,id=balloon0 \
-boot menu=on \
-pidfile /var/run/kvmorion.pid \
-daemonize
Using 1 CPU doesn't make a difference.
Only workaround is disabling hpet (-no-hpet)
Sample time drift in guest:
>ntpdate -q 10.124.241.211
5 Dec 13:36:06 ntpdate[3464]: Raised to realtime priority class
server 10.124.241.211, stratum 2, offset 3.694184, delay 0.02551
5 Dec 13:36:12 ntpdate[3464]: step time server 10.124.241.211 offset
3.694184 s
ec
>ntpdate -q 10.124.241.211
5 Dec 13:52:02 ntpdate[1964]: Raised to realtime priority class
server 10.124.241.211, stratum 2, offset 4.719968, delay 0.02554
5 Dec 13:52:08 ntpdate[1964]: step time server 10.124.241.211 offset
4.719968 s
ec
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