On 16.09.16 17:35, Dirk Müller wrote:
> Hi Alex,
> 
> 2016-09-15 13:47 GMT+02:00 Alexander Graf <ag...@suse.de>:
> 
>> 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
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