On 16.09.16 17:35, Dirk Müller wrote: > Hi Alex, > > 2016-09-15 13:47 GMT+02:00 Alexander Graf <[email protected]>: > >> However, because we have people who have Leap 42.1 and current Tumbleweed >> installed, we can’t just switch from 64k to 4k PAGE_SIZE, because our friend >> btrfs embeds the page size into its on-disk format and can only read it when >> they’re identical. So switching would break existing btrfs installations. > > It is not only btrfs, but also swap. But the latter problem can be > solved easier. In addition, switching to 4k also enables 48bit VA, > which opens another can of worms.
Yes, but it's a can of worms that we have to open anyway unfortunately. Systems are growing and I doubt 42 bits are going to get us very far. >> There hasn’t been any well working solution to make btrfs more compatible, >> we don’t really want 42.2 to diverge from its origins and 4k gets us running >> on smaller systems which are starting to pop up more and more in the 64bit >> world. Given all that, is anyone seriously opposed to switching everything >> to 4k? > > Are we talking about 42.2 or tumbleweed ? I'm sort of okay with doing > that for 42.2 when we document it properly and mayb ealso fix the swap > issue. Because I seriously hope not that many people are using btrfs. You mean if you're on an ext4 rootfs and upgrade to 42.2, swap should stay working? Any constructive ideas? > For tumbleweed, I would only want to switch when we have sorted out > the remaining issues. And only because I am going to be hit by this > badly. What are "the remaining issues"? Alex -- To unsubscribe, e-mail: [email protected] To contact the owner, e-mail: [email protected]
