zstd compression for packages

[Julian Andres Klode]

On Sat, Mar 17, 2018 at 03:09:55PM +0000, Dimitri John Ledkov wrote:
> On 16 March 2018 at 22:13, Steve Langasek <steve.langasek at ubuntu.com> wrote:
> > In other words: if we want to make this the default, we should quantify
> > Daniel's remark that he would prefer a 6% faster download over a 10% faster
> > unpack.
> >
> 
> Well, I think it does not make sense to think about this in absolute
> terms. Thinking about user stories is better.
> 
> A stable series user will be mostly upgrading packages from -security
> and -updates. The download speed and/or size of debs does not matter
> much in this case, as these are scheduled to be done in the background
> over the course of the day, via unattended upgrades download timer.
> Installation speed matters, as that is the window of time when the
> system is actually somewhat in a maintenance mode / degraded
> performance (apt is locked, there are CPU and disk-io loads).

I'd like us to have https://wiki.debian.org/Teams/Dpkg/Spec/DeltaDebs
this would mostly solve that problem too.

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