Experience has shown that keeping too many entries increases disk usage
and, more importantly, leads to long delays when cleaning up the cache,
measured in minutes on slow or busy HDDs with hundreds of thousands of
cache entries, as is common on build machines. In those cases, the cost
of the cache outweighs its benefit.
* guix/scripts/substitute.scm (%narinfo-expired-cache-entry-removal-delay):
Reduce to 5 days.
(cached-narinfo-expiration-time)[max-ttl]: Reduce to 2 days.
Change-Id: Iab212f572ee9041be61716423a3c014f93fe81ed
7e00fb9f31