Re: Hangs

Roland Lammel
2008-11-21T23:46:24Z

On Fri, Nov 21, 2008 at 10:01 PM, Daniel P. Berrange
<berrange@redhat.com> wrote:
> On Fri, Nov 21, 2008 at 09:29:43PM +0100, Roland Lammel wrote:
>> On Fri, Nov 21, 2008 at 4:55 PM, Glauber Costa <glommer@redhat.com> wrote:
>> > On Thu, Nov 20, 2008 at 02:56:00AM +0100, Marcelo Tosatti wrote:
>> >>
>> >> Why are you using -no-acpi? Perhaps switch the guest to acpi_pm to isolate
>> >> kvm-clock issues?
>>
>> I've changed one guest to use acpi and use the acpi_pm clock source.
>>
>> Running now with:
>> /usr/local/bin/qemu-system-x86_64 -S -M pc -m 500 -smp 1 -name bit
>> -monitor pty -no-acpi -boot c -drive
>> file=/var/kvm/bit.img,if=virtio,index=0,boot=on -net
>> nic,macaddr=24:42:53:21:52:45,vlan=0,model=virtio -net
>> tap,fd=11,script=,vlan=0,ifname=vnet0 -serial tcp:127.0.0.1:50401
>> -parallel none -usb -vnc 0.0.0.0:45001
>>
>> Actually I had similar problems when using kvm-72 and acpi, and after
>> switching to libvirt for configuration it automatically changed to
>> no-acpi which I just left that way to try it. I've read mixed
>> recommendaction concerning ACPI.
>
> FYI, libvirt allows you to turn ACPI on or off. In the XML document,
> the top level <domain> tag can contains a set of features, one of
> which is ACPI, eg.
>
>
> <domain type='kvm'>
> <name>foo</name>
> .....
> <features>
> <acpi/>
> </features>
> ....
> </domain>
>
> If the '<acpi/>' tag is left out, libvirt will add -no-acpi to QEMU
> command line.

Thanks, just found the acpi flag today and am using it now for the domains.

> For more information check out the docs here:
>
> http://libvirt.org/formatdomain.html#elementsFeatures
>
>> So should acpi be enabled generelly (for modern kernels and systems)?
>> Should ntpd be running on the guests, or just the host when using acpi_pm?
>
> The virt-install & virt-manager tools will enable ACPI by default for
> nearly all OS, except for a couple of very old Windows which don;t
> commonly work

I actually installed the domain manually once and just cloned it, but
thanks to point that out!

Regards

+rl
--
Roland Lammel
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