Hey,

While I've been working on the software side of building things for
substitutes through the Guix Build Coordinator for over a year now [1],
I've only been personally pushing to bring the benefits to Guix users by
default for the last few weeks [2].

1: https://lists.gnu.org/archive/html/guix-devel/2020-04/msg00323.html
2: https://lists.gnu.org/archive/html/guix-devel/2021-05/msg00020.html

The strategy that currently seems most feasible is to add an additional
default source of substitutes: bordeaux.guix.gnu.org.

I think things are pretty much ready, you can find some information at
https://bordeaux.guix.gnu.org/ . If you're up for trying out fetching
substitutes from bordeaux.guix.gnu.org, now is a good time to do so, and
please report back in terms of how it's working out for you.

If you're interested in the infrastructure behind bordeaux.guix.gnu.org,
these are the machines which are currently involved:

 - bayfront
   - running the coordinator
   - serving the substitutes
   - building things for x86_64-linux plus i686-linux

 - harbourfront
   - building things for x86_64-linux plus i686-linux

 - milano-guix-1
   - building things for x86_64-linux plus i686-linux

 - monokuma
   - building things for aarch64-linux

 - polaris
   - sometimes building things for powerpc64le-linux

Just let me know if you have any comments or questions.

Thanks,

Chris