Re: Small rant: installer environment size

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On Thu, 2022-12-08 at 20:43 +0100, drago01 wrote:
> On Thursday, December 8, 2022, Chris Adams <linux@xxxxxxxxxxx> wrote:
> > Once upon a time, Daniel P. Berrangé <berrange@xxxxxxxxxx> said:
> > > On Thu, Dec 08, 2022 at 07:59:20PM +0100, drago01 wrote:
> > > > That would be very crazy, as you will have a degraded user experience
> > > > (laggy UI, wrong resolution, ...) to save a couple of megabytes that
> > are a
> > > > non issue for today's hardware.
> > > 
> > > Please bear in mind the difference between bare metal and virtual
> > > machines. The bare metal machine may have 32 GB of RAM, making a
> > > 800 MB install image a non-issue. For a public cloud virtual machine
> > > though, this could bump your VM sizing up 1 level from 2 GB quota
> > > to a 4 GB RAM quota, with correspondingly higher price point.
> > 
> > Also "today's hardware" increasingly includes small devices like
> > Raspberry Pi.  ARM devices don't typically use anaconda, but there are
> > also small x86 based devices competing with the small ARM devices.
> > 
> > I think the answer is "no", but I'll ask anyway: is there a way to evict
> > all the firmware once the system is started?  I'm guessing that as long
> > as it's all in one disk image, that's not possible.  Can we tack on a
> > second disk image with use-once (at most) stuff and then drop the whole
> > image after startup?
> > 
> Again there is no reason why everything on the disk image had to be loaded
> into memory in the first place. Same way when you boot your installed
> system, not everything on disk is loaded into memory. If you don't need the
> firmware, it should stay on the install media and never be loaded into
> memory.

The problem is, what is "the install media"? We don't *only* support
installs from USB sticks and DVDs - things the installer could
potentially access as local storage after starting up. We also do
installs where everything is retrieved over the network - PXE installs,
for instance.

There are possible ways to finesse things even in those cases - as I
said, Daniel started thinking them through a bit - but it's not as
simple as just "put this stuff on the ISO and read it off that".
Adam Williamson
Fedora QA
IRC: adamw | Twitter: adamw_ha

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