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List:       fedora-devel-list
Subject:    Re: F34 Change: Reduce installation media size by improving the compression ratio of SquashFS filesy
From:       Michel Alexandre Salim <michel () michel-slm ! name>
Date:       2020-08-27 22:54:13
Message-ID: f5eff9764e09d5e48a0210de62bf6ad1ebf4aecb.camel () michel-slm ! name
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On Thu, 2020-08-27 at 11:13 -0400, Ben Cotton wrote:
> https://fedoraproject.org/wiki/Changes/OptimizeSquashFS
> 
> == Summary ==
> Improve compression ratio of SquashFS filesystem on the installation
> media.
> 
...
> 
> Based on the results above, I'd suggest selecting the following
> ''optimal configuration'': XZ algorithm, with block size of 1MiB and
> without BCJ filter (plain xz -b 1M, without -Xbcj x86).
> On the right, you can see the impact of the compression algorithms on
> installation time.
> 
Why XZ as opposed to, say, ZSTD?

The latter is already available in squashfs-tools as of July 2019:
https://bugzilla.redhat.com/show_bug.cgi?id=1648490

Best regards,

-- 
Michel Alexandre Salim
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