Fedora 40 firms up for release

Fedora 40 firms up for release

I just looked over my logs for Fedora 39; for various reasons, delta RPMs have cost me more network transfer than they've saved (usually because the kernel's delta RPMs did not reconstruct cleanly, so having downloaded a 20 MiB delta, it's followed up by downloading the 100 MiB full RPM).

So, the tradeoff with the current state of delta RPMs is you either use less CPU and less network transfer by not using delta RPMs, or you use more CPU and more network transfer to do delta RPMs then fall back to downloading the full RPM. And that's on the basis that you update daily, and thus the current generation strategy of only producing a delta against the previous RPM version actually creates deltas you can use; if you update less frequently (to reduce the amount of network transfer you use for metadata), you get access to fewer deltas, since you're more likely to have missed an intermediate update.

If people actually cared about delta RPMs, they'd be working on fixing those issues; but nobody cares, so they're getting disabled instead.