How to compile the kernel correctly with zstd?

[jiutian]

What should I pay attention to when compiling the kernel with zstd compression? After I compile, I start and run in black screen.

I also installed zstd

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Code: Select all

Kernel compression mode (zstd) --->


 [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support                      
                ()    Initramfs source file(s)                                                          
                [  ]   Support initial ramdisk/ramfs compressed using gzip                               
                [  ]   Support initial ramdisk/ramfs compressed using bzip2                              
                [  ]   Support initial ramdisk/ramfs compressed using LZMA                               
                [  ]   Support initial ramdisk/ramfs compressed using XZ                                 
                [  ]   Support initial ramdisk/ramfs compressed using LZO                                
                [  ]   Support initial ramdisk/ramfs compressed using LZ4                                
                [*]   Support initial ramdisk/ramfs compressed using ZSTD

[pietinger]

What should I pay attention to when compiling the kernel with zstd compression? After I compile, I start and run in black screen.

We had a lot of problems with "black screen" in the last time. It is always a missing framebuffer configuration: https://wiki.gentoo.org/wiki/Framebuffe ... er_drivers

(I cant help with zstd; but we have some experts for it also in our forum; just wait; in the meantime you could do your FB)

[mike155]

Have you seen: https://wiki.gentoo.org/wiki/Zstd?

As @pietinger already pointed out, a black screen is probably related to an incorrect framebuffer configuration. If you want help, then post your kernel config using wgetpaste, please.

[jiutian]

Kernel compression mode (zstd) --->


[*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
() Initramfs source file(s)
[ *] Support initial ramdisk/ramfs compressed using gzip
[ *] Support initial ramdisk/ramfs compressed using bzip2
[ *] Support initial ramdisk/ramfs compressed using LZMA
[ *] Support initial ramdisk/ramfs compressed using XZ
[ *] Support initial ramdisk/ramfs compressed using LZO
[ *] Support initial ramdisk/ramfs compressed using LZ4
[*] Support initial ramdisk/ramfs compressed using ZSTD

After the test, the boot is normal after all selections. Is this a kernel bug?

What should I pay attention to when compiling the kernel with zstd compression? After I compile, I start and run in black screen.

We had a lot of problems with "black screen" in the last time. It is always a missing framebuffer configuration: https://wiki.gentoo.org/wiki/Framebuffe ... er_drivers

(I cant help with zstd; but we have some experts for it also in our forum; just wait; in the meantime you could do your FB)

[mike155]

After the test, the boot is normal after all selections. Is this a kernel bug?

No.

It probably means:

1. Your early framebuffer doesn't work
2. Your initramfs is NOT compressed with zstd

[alamahant]

I use a zstd-compressed kernel and modules.
My .config

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CONFIG_HAVE_KERNEL_ZSTD=y
CONFIG_KERNEL_ZSTD=y
CONFIG_RD_ZSTD=y
CONFIG_MODULE_COMPRESS_ZSTD=y
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD is not set
# CONFIG_ZRAM_DEF_COMP_ZSTD is not set
CONFIG_F2FS_FS_ZSTD=y
CONFIG_UBIFS_FS_ZSTD=y
CONFIG_SQUASHFS_ZSTD=y
CONFIG_PSTORE_ZSTD_COMPRESS=y
CONFIG_PSTORE_ZSTD_COMPRESS_DEFAULT=y
CONFIG_PSTORE_COMPRESS_DEFAULT="zstd"
CONFIG_CRYPTO_ZSTD=y
CONFIG_ZSTD_COMPRESS=y
CONFIG_ZSTD_DECOMPRESS=y
CONFIG_DECOMPRESS_ZSTD=y

You need to emerge

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USE="zstd" emerge -1av sys-apps/kmod

Plz make the flag permanent via package.use
Do this before building the kernel.
Then set zstd compression for initramfs --in my case dracut:

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compress="zstd"

[figueroa]

I have USE "zstd" set globally in make.conf. Following are my kernel settings. I don't use an initramfs.

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$ grep -i zstd /usr/src/linux/.config
CONFIG_HAVE_KERNEL_ZSTD=y
CONFIG_KERNEL_ZSTD=y
CONFIG_RD_ZSTD=y
# CONFIG_CRYPTO_ZSTD is not set
CONFIG_ZSTD_DECOMPRESS=y
CONFIG_DECOMPRESS_ZSTD=y

I don't think I read the wiki before I switched over.

[jiutian]

O (∩∩) O thank you

I use a zstd-compressed kernel and modules.
My .config

Code: Select all

CONFIG_HAVE_KERNEL_ZSTD=y
CONFIG_KERNEL_ZSTD=y
CONFIG_RD_ZSTD=y
CONFIG_MODULE_COMPRESS_ZSTD=y
# CONFIG_ZSWAP_COMPRESSOR_DEFAULT_ZSTD is not set
# CONFIG_ZRAM_DEF_COMP_ZSTD is not set
CONFIG_F2FS_FS_ZSTD=y
CONFIG_UBIFS_FS_ZSTD=y
CONFIG_SQUASHFS_ZSTD=y
CONFIG_PSTORE_ZSTD_COMPRESS=y
CONFIG_PSTORE_ZSTD_COMPRESS_DEFAULT=y
CONFIG_PSTORE_COMPRESS_DEFAULT="zstd"
CONFIG_CRYPTO_ZSTD=y
CONFIG_ZSTD_COMPRESS=y
CONFIG_ZSTD_DECOMPRESS=y
CONFIG_DECOMPRESS_ZSTD=y

You need to emerge

Code: Select all

USE="zstd" emerge -1av sys-apps/kmod

Plz make the flag permanent via package.use
Do this before building the kernel.
Then set zstd compression for initramfs --in my case dracut:

Code: Select all

compress="zstd"

[jiutian]

O (∩∩) O thank you

I have USE "zstd" set globally in make.conf. Following are my kernel settings. I don't use an initramfs.

Code: Select all

$ grep -i zstd /usr/src/linux/.config
CONFIG_HAVE_KERNEL_ZSTD=y
CONFIG_KERNEL_ZSTD=y
CONFIG_RD_ZSTD=y
# CONFIG_CRYPTO_ZSTD is not set
CONFIG_ZSTD_DECOMPRESS=y
CONFIG_DECOMPRESS_ZSTD=y

I don't think I read the wiki before I switched over.