[Qemu-devel] [Bug 599958] Re: Timedrift problems with Win7 + qemu-kvm

[Lucas Meneghel Rodrigues]

Indeed -no-hpet made the tests pass. It's still uncertain to me whether
this flag is supported across several branches of qemu-kvm, if it's
supported in all branches I'm going to update the upstream kvm autotest
config file.

-- 
Timedrift problems with Win7 + qemu-kvm
https://bugs.launchpad.net/bugs/599958
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Status in QEMU: New

Bug description:
We've been finding timedrift issues witth Win7 under qemu-kvm on our daily 
testing

kvm.qemu-kvm-git.smp2.Win7.64.timedrift.with_load       FAIL    1       Time 
drift too large after rest period: 38.63%
kvm.qemu-kvm-git.smp2.Win7.64.timedrift.with_reboot     FAIL    1       Time 
drift too large at iteration 1: 17.77 seconds
kvm.qemu-kvm-git.smp2.Win7.64.timedrift.with_migration  FAIL    1       Time 
drift too large at iteration 2: 3.08 seconds

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.with_migration

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.with_reboot

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