Re: [fedora-virt] ANNOUNCE: Augeas support added to libguestfs

[Richard W.M. Jones]

On Tue, Apr 21, 2009 at 10:12:47PM +0200, Ján ONDREJ (SAL) wrote:
> On Tue, Apr 21, 2009 at 09:53:20AM +0200, Ján ONDREJ (SAL) wrote:
> > Another feature enhacement requirement:
> >
> > can you add an option "--kvm" to use qemu-kvm instead of qemu? It's much
> > faster (aprox 50%) on machines, which support hardware virtualization.
> > Also you need to remove --no-kqemu option, which is not recognized by
> > qemu-kvm. May be ability to run kvm may be autodetected in future, but I
> > think, if there is no kvm support, qemu-kvm will run in normal qemu mode.
>
> Some tests with qemu or kvm:
>
> [ondrejj@work libguestfs]$ time ./fish/guestfish -a /home/images/test.img -m
> /dev/sda1 launch
> Could not open '/dev/kqemu' - QEMU acceleration layer not activated: No such
> /file or directory
> qemu: loading initrd (0x139cb32 bytes) at 0x16c53000
>
> real    0m27.033s
> user    0m0.016s
> sys     0m0.047s
> [ondrejj@work libguestfs]$ time ./fish/guestfish -a /home/images/test.img -m
> /dev/sda1 launch
> qemu: loading initrd (0x139cb32 bytes) at 0x0000000016c53000
>
> real    0m7.593s
> user    0m0.028s
> sys     0m0.052s
> [ondrejj@work libguestfs]$
>
> As you can see, it's more than 3.5 times faster. :)
>
> May be you can check, if there is qemu-kvm binary and if does not exist,
> then use standard qemu. This may be work well on all architectures.

Yes, that's a huge improvement.

Rich.