Re: [PATCH 0/3] ARM ZSTD boot compression

[Arnd Bergmann]

On Wed, Apr 12, 2023, at 23:21, Jonathan Neuschäfer wrote:
> This patchset enables ZSTD kernel (de)compression on 32-bit ARM.
> Unfortunately, it is much slower than I hoped (tested on ARM926EJ-S):
>
>  - LZO:  7.2 MiB,  6 seconds
>  - ZSTD: 5.6 MiB, 60 seconds

That seems unexpected, as the usual numbers say it's about 25%
slower than LZO. Do  you have an idea why it is so much slower
here? How long does it take to decompress the
generated arch/arm/boot/Image file in user space on the same
hardware using lzop and zstd?

       Arnd