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

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Date:   Wed, 12 Apr 2023 23:33:15 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        linux-arm-kernel@...ts.infradead.org
Cc:     "Russell King" <linux@...linux.org.uk>,
        "Nick Terrell" <terrelln@...com>,
        "Tony Lindgren" <tony@...mide.com>,
        "Geert Uytterhoeven" <geert+renesas@...der.be>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Sebastian Reichel" <sebastian.reichel@...labora.com>,
        "Hawkins, Nick" <nick.hawkins@....com>,
        "Christophe Leroy" <christophe.leroy@...roup.eu>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        "Nick Desaulniers" <ndesaulniers@...gle.com>,
        "Xin Li" <xin3.li@...el.com>,
        "Seung-Woo Kim" <sw0312.kim@...sung.com>,
        "Paul Bolle" <pebolle@...cali.nl>,
        "Bart Van Assche" <bvanassche@....org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] ARM ZSTD boot compression

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