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Re: btrfs compression by default



On Tue, 2021-02-09 at 19:40 +0100, Martin Kolman wrote:
> On Tue, 2021-02-09 at 09:50 -0700, Chris Murphy wrote:
> > On Tue, Feb 9, 2021 at 9:15 AM Michel Alexandre Salim
> > <michel michel-slm name> wrote:
> > > There's a further complication: Chris just informed me that on
> > > BIOS
> > > systems, space is more of a constraint so the zstd module is not
> > > part
> > > of GRUB ... meaning we have to handle these two scenarios:
> > 
> > It's available, but it's the 2nd largest GRUB module at ~100KiB.
> > And
> > on BIOS we're space limit right now to 1 MiB MBR gap or BIOS Boot
> > partition.
> > 
> > GRUB works fine with a zstd compressed /boot/ but obviously there's
> > next to no benefit compared to the added complexity since the
> > kernel
> > and initramfs are already compressed.
> > 
> > So if it's not difficult to exclude compression on /boot/ that's
> > probably preferred?
> Are we talking about custom partitioning layouts ? 
> 
> Because I've just booted a current Rawhide installer and it creates
> /boot on a separate standard partition
> formatted with EXT4 by default, with / and /home on BTRFS.
> 
Yup, the "being able to keep /boot uncompressed" is mostly to make sure
people who do custom layouts (and are using BIOS instead of UEFI) don't
get in a bad state.

Thanks,

-- 
Michel Alexandre Salim
profile: https://keyoxide.org/michel michel-slm name
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