Maxim Cournoyer <maxim.cournoyer@gmail.com> writes:

> But it appears most of my /gnu/store content is not using compression at
> all, perhaps because Btrfs will not compress files it knows wouldn't
> compress well (e.g. already compressed archives).

Hmmm... If you've got a lot of source archives in your store, this is
would be true, but libraries and binaries compress very well in general,
so I would also expect more than 10%.  Have you tried cleaning up some
of the compressed archives?

-- 
Pierre Neidhardt
https://ambrevar.xyz/