linux-kernel - Re: [RFC PATCH] treewide: remove bzip2 compression support

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Date:   Tue, 15 Dec 2020 22:51:57 +0100
From:   Michal Suchánek <msuchanek@...e.de>
To:     "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-mips@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, torvalds@...ux-foundation.org
Subject: Re: [RFC PATCH] treewide: remove bzip2 compression support

Hello,

On Tue, Dec 15, 2020 at 02:03:15PM -0500, Alex Xu (Hello71) wrote:
> bzip2 is either slower or larger than every other supported algorithm,
> according to benchmarks at [0]. It is far slower to decompress than any
> other algorithm, and still larger than lzma, xz, and zstd.
> 
> [0] https://lore.kernel.org/lkml/1588791882.08g1378g67.none@localhost/

Sounds cool. I wonder how many people will complain that their
distribution migrated to bzip2 but got stuck there and now new kernels
won't work on there with some odd tool or another :p

> @@ -212,11 +209,6 @@ choice
>  	  Compression speed is only relevant when building a kernel.
>  	  Decompression speed is relevant at each boot.
>  
> -	  If you have any problems with bzip2 or lzma compressed
> -	  kernels, mail me (Alain Knaff) <alain@...ff.lu>. (An older
> -	  version of this functionality (bzip2 only), for 2.4, was
> -	  supplied by Christian Ludwig)
> -
Shouldn't the LZMA part be preserved here?

Thanks

Michal