Re: [Qemu-devel] Question about qemu firmware configuration (fw_cfg) device

[Richard W.M. Jones]

On Mon, Jul 19, 2010 at 09:40:18AM +0200, Alexander Graf wrote:
> Richard, what does kvm_stat tell you while loading the initrd? Are
> there a lot of PIO requests or are we simply looping inside qemu
> code?

The two attached files were made by running kvm_stat -l > /tmp/...
during a single run starting libguestfs.  This use of kvm_stat is as
described in Chris's blog entry here:
http://clalance.blogspot.com/2009/01/kvm-performance-tools.html

The first attachment ('no-patch') is without the proposed patch.

The second attachment ('with-patch') is with the proposed patch.

It seems some numbers such as #vmexits are lower with the proposed
patch, although not by a very much.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v

no-patch
Description: Text document

with-patch
Description: Text document