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[libvirt] Fwd: How do you disable hpet in a kvm?

Forwarding to libvir-list.

The KVM developers have been recommending that all guests use -no-hpet
flag.  Indeed, we've been adding this flag in libguestfs for quite a
long time.  However I notice that libvirt [in Rawhide] does not
include this flag for my guests.


----- Forwarded message from "Frederick N. Brier" <fnbrier gmail com> -----

Subject: [fedora-virt] How do you disable hpet in a kvm?
Date: Tue, 08 Jun 2010 14:15:06 -0400
To: virt lists fedoraproject org

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 

Ideally, is there a way to disable HPET in the BIOS for a specific VM, and 
not all VMs.  Thank you.


virt mailing list
virt lists fedoraproject org

----- End forwarded message -----

Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
New in Fedora 11: Fedora Windows cross-compiler. Compile Windows
programs, test, and build Windows installers. Over 70 libraries supprt'd
http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw

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