Libguestfs - Jul 2017 - performance between guestfish and qemu-nbd

I can mount qcow2 img to nbd devices through guestfish or qemu-nbd

I'm curious about which performance is better?

On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome
wrote:
> I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
> 
> I'm curious about which performance is better?
They do quite different things, they're not comparable.

Can you specifically give the commands you are trying?  We might be
able to give more sensible advice.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
Fedora Windows cross-compiler. Compile Windows programs, test, and
build Windows installers. Over 100 libraries supported.
http://fedoraproject.org/wiki/MinGW

2017-07-27 20:18 GMT+08:00 Richard W.M. Jones <rjones@redhat.com>:
> On Thu, Jul 27, 2017 at 06:34:13PM +0800, lampahome wrote:
> > I can mount qcow2 img to nbd devices through guestfish or qemu-nbd
> >
> > I'm curious about which performance is better?
>
> They do quite different things, they're not comparable.
>
> Can you specifically give the commands you are trying?  We might be
> able to give more sensible advice.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
> rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> Fedora Windows cross-compiler. Compile Windows programs, test, and
> build Windows installers. Over 100 libraries supported.
> http://fedoraproject.org/wiki/MinGW
>
guestfish:
guestfish --rw -a demo.qcow2 -m /dev/nbd0

qemu-nbd:
qemu-nbd -c /devnbd0 demo.qcow2

I just want to mount demo.qcow2 to a device