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>
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