Re: Hangs

Roland Lammel
2008-12-06T23:18:48Z

I just like to note that my issues with the clock were solved when I
switched to acpi_pm clock. I can still reproduce the hang with the
kvm_clock though.

I still use ntpd in the guests, as it is not clear to me whether the
acpi_pm clock synchronizes to the hostclock or not.

random@bit:~$ uptime
00:15:21 up 13 days, 21:44, 1 user, load average: 0.00, 0.00, 0.00

In case you want some more info on the hangs when using kvm_clock,
please drop me a mail.

Cheers and thanks for all your help

+rl

On Sat, Nov 22, 2008 at 00:46, Roland Lammel <rl@brabbel.net> wrote:
> 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
> QuikIT - IT Lösungen - flexibel und schnell
> Web: http://www.quikit.at
> Email: info@quikit.at
>
> "Enjoy your job, make lots of money, work within the law. Choose any two."
>

--
Roland Lammel
QuikIT - IT Lösungen - flexibel und schnell
Web: http://www.quikit.at
Email: info@quikit.at

"Enjoy your job, make lots of money, work within the law. Choose any two."