Timedrift problems with Win7: hpet missing time drift fixups
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
QEMU |
Expired
|
Wishlist
|
Unassigned |
Bug Description
We've been finding timedrift issues witth Win7 under qemu-kvm on our daily testing
kvm.qemu-
kvm.qemu-
kvm.qemu-
Steps to reproduce:
timedrift.with_load
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Run load on the guest and host.
4) Take a second time reading.
5) Stop the load and rest for a while.
6) Take a third time reading.
7) If the drift immediately after load is higher than a user-
specified value (in %), fail.
If the drift after the rest period is higher than a user-specified value,
fail.
timedrift.
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Migrate the guest.
4) Take a second time reading.
5) If the drift (in seconds) is higher than a user specified value, fail.
timedrift.
1) Log into a guest.
2) Take a time reading from the guest and host.
3) Reboot the guest.
4) Take a second time reading.
5) If the drift (in seconds) is higher than a user specified value, fail.
This bug is to register those issues and keep an eye on them.
Attached, some logs from the autotest tests executed on the guest
summary: |
- Timedrift problems with Win7 + qemu-kvm + Timedrift problems with Win7: hpet missing time drift fixups |
Changed in qemu: | |
importance: | Undecided → Wishlist |
status: | New → Confirmed |
Does adding -no-hpet make a difference? I assume that Win7 is using hpet by default and we currently don't do any time drift mitigation with hpet.