I guess it consumes 3 GiB of RAM if and only if you have much of unneeded RAM. 
When you need the RAM for other VMs, it should be freed by the VMs.

But maybe a fixed amount of RAM is better suited for VMs that are expected to 
be using rather a constant amount of RAM, for two reasons. First, Qubes tries 
adding some margin for caches etc. Second, memory balancing must have some 
overhead.

Moreover, sys-net and sys-usb do have a constant amount of RAM assigned, as 
they have some PCI device assigned.

When tight on memory, I was able to go as low as 200 MiB for sys-net. The same 
would probably apply to sys-firewall and sys-usb. If you are not so tight, I'd 
recommend slightly more, like 250MiB or 300MiB.

Regards,
Vít Šesták 'v6ak'

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