Loading from squashfs with zstd compression slower than ext4

Simon Glass sjg at chromium.org
Wed May 31 19:13:42 CEST 2023

Hi Jonathan,

On Wed, 31 May 2023 at 06:52, Jonathan Liu <net147 at gmail.com> wrote:
> Hi All,
> I noticed that loading from squashfs with zstd compression is
> significantly slower than ext4 on RK3399 using U-Boot 2022.01. The
> filesystem is located on eMMC.
> I have CONFIG_BLOCK_CACHE=y in .config and am using the generic load command.
> ext4:
> 15682578 bytes read in 366 ms (40.9 MiB/s)
> SquashFS with zstd compression:
> 15685001 bytes read in 2339 ms (6.4 MiB/s)
> Any suggestions on how to speed up loading from SquashFS with zstd compression?

Could it just be that zstd is slow? Have you tried lz4?


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