On 06/08/2010 04:37 PM, Laine Stump wrote:
On 06/08/2010 02:15 PM, Frederick N. Brier wrote:
I installed PBX In A Flash (PIAF) as a VM on a Fedora 11 64 bit
host. PIAF is a 32 bit CentOS 5.2 distro for running Asterisk. I,
like many others, am getting the error message "rtc: lost some
interrupts at 1024hz" repeating over and over on the console. Some
people have apparently gotten rid of this error message by disabling
hpet in the BIOS. However, this is a VM (kvm).
I tried adding nohpet as a kernel parameter in /boot/grub/menu.lst,
but that effects the linux OS, not the BIOS. It did not fix it.
I found references to a -no-hpet qemu parameter. However, I cannot
find how to set it in a VM created using virt-manager and an ISO
image. In the /etc/libvirt of the host I found XML configuration
files describing the VMs. These appear to be the same as those
created using the virsh dumpxml command. There does not appear to be
an XML element as there is for acpi and apic. The man page
describing the XML format does not have an HPET related option. I
could not find an example or sample of it being disabled in a libvirt
XML file. Nor does there appear to be a schema (xsd or dtd) for the
libvirt file format, which might have had an hpet element or attribute.
Ideally, is there a way to disable HPET in the BIOS for a specific
VM, and not all VMs? Thank you.
If you are running libvirt 0.8.0 or newer, and if your qemu-kvm
supports the -no-hpet option (check the output of "qemu-kvm --help"),
you can add the -no-hpet option for qemu-kvm for a particular domain
by editing the domain's XML (with "virsh edit domainname") and adding
<timer name='hpet' present='no'/>
to the "clock" section. It will end up looking something like this:
<clock offset='utc'>
<timer name='hpet' present='no'/>
</clock>
Brilliant answer. This is exactly the feature I need, but my Fedora 11
hosts are at libvirt 0.6.2 and Fedora 13 appears to only be up to
0.7.7. Is it possible (and stable) to upgrade a Fedora 11 or 13 to
libvirt 0.8.0+? Could you please post a link to documentation on how to
upgrade libvirt? Is there a specific 0.8.0 version you would upgrade
to? Thank you.
Fred
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