[Libguestfs] [PATCH v2 7/7] v2v: rvh-upload: Match nbdkit threads to qemu-img coroutines

[Richard W.M. Jones]

On Mon, Jan 25, 2021 at 01:44:26PM +0200, Nir Soffer wrote:
> On Mon, Jan 25, 2021 at 11:58 AM Richard W.M. Jones <rjones at redhat.com> wrote:
> >
> >
> > This series is fine apart from two typos.  You can push it
> > if you want, unless you want to do more testing/tweaking.
> 
> I want to test it first with a real environment since my tests are
> not stable.
> 
> Also I'm worried about using -W for all conversion - we should use it only
> if the output is using parallel thread model, otherwise it does not give
> any benefit and it will may cause unwanted fragmentation in the target
> image.
> 
> Should we have something like:
> 
>    if output#parallel then
>        use unordered writes...
> 
> What do you think?

Yes, good idea.  Although maybe output#write_out_of_order is better as
that is how the qemu-img -W option is described in the docs.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
http://libguestfs.org/virt-builder.1.html