linux-kernel - Re: [PATCH 3/3] ARM: compressed: Enable ZSTD compression

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Message-ID: <CACRpkdY1XQqz84cHVHhhbphKqXMtxVFs3TPLeEb7YHjzKu0K_w@mail.gmail.com>
Date:   Wed, 12 Apr 2023 23:45:18 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>,
        Nick Terrell <terrelln@...com>, Arnd Bergmann <arnd@...db.de>,
        Tony Lindgren <tony@...mide.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Nick Hawkins <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,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 3/3] ARM: compressed: Enable ZSTD compression

On Wed, Apr 12, 2023 at 11:22 PM Jonathan Neuschäfer
<j.neuschaefer@....net> wrote:

> With the previous two commits, it is possible to enable ZSTD
> in the decompressor stub for 32-bit ARM.
>
> Unfortunately, ZSTD decompression has been quite slow in my tests
> (on ARM926EJ-S, ARMv5T):
>
>  - LZO:  7.2 MiB,  6 seconds
>  - ZSTD: 5.6 MiB, 60 seconds
>
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>

Disappointingly slow, but not all systems are 926, and
not all memory hierarchies are as slow.
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij