[Qemu-devel] [Bug 599958] Re: Timedrift problems with Win7: hpet missing time drift fixups

[Lucas Meneghel Rodrigues]

Sent patch http://patchwork.test.kernel.org/patch/2384/ to autotest and
will update the autotest server to reflect that option.

-- 
Timedrift problems with Win7: hpet missing time drift fixups
https://bugs.launchpad.net/bugs/599958
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.

Status in QEMU: Confirmed

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