Commits on Apr 19, 2024

1. linux kernel: prefer zstd where possible …

   Closes NixOS#302291
   Closes NixOS#301536
   
   The following things have changed:
   
   * For 5.7+: ZSWAP compressor uses zstd now.
   * For 5.11+: ZRAM compressor uses zstd now.
   * For 5.13+: kernel modules are compressed with zstd instead of xz.
   * For 5.19+: support zstd-compressed firmware.
   
   The modules-closure functionality needed explicit support for copying
   over `.zst` files. Also, the VM image builder used busybox's `insmod`
   before which doesn't support zstd. Switched to `kmod` and added xz/zstd
   as dependencies for it, similar to how it's done for the actual stage1
   in d33e52b. The use of `kmod` here
   doesn't seem to be such a big deal since it's only a build-time
   dependency.

   

   Ma27 committed Apr 19, 2024
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2. nixos/udev: compress firmware with zstd if possible …

   Closes NixOS#267442
   
       $ nix path-info -Sh /nix/store/qj1dm7wfw5m3mxf1gn3fdm0az9y1h5ny-linux-firmware-20240312-xz
       /nix/store/qj1dm7wfw5m3mxf1gn3fdm0az9y1h5ny-linux-firmware-20240312-xz	440.3M
       $ nix path-info -Sh /nix/store/c3szcjxb3g990dbiz7llwmkaf0bi98j2-linux-firmware-20240312-zstd
       /nix/store/c3szcjxb3g990dbiz7llwmkaf0bi98j2-linux-firmware-20240312-zstd	460.6M
   
   This is an increase of 4.4%, but OTOH zstd has a significantly higher
   decompression speed[1].
   
   [1] https://gregoryszorc.com/blog/2017/03/07/better-compression-with-zstandard/

   

   Ma27 committed Apr 19, 2024
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