Disk IO speed regression after upgrading from 24.05 to either 24.11 or unstable

[vfosnar]

Describe the bug

I've tried switching to unstable ~month ago and notices an extreme disk IO speed slowdown. I reverted back to stable. Today I switched to 24.11 beta and the bug seems to still be there.

Disk IO seems to be extremely slow after upgrading to either 24.11 or unstable. I'm using

boot.kernelPackages = pkgs.linuxPackages_latest;

Steps To Reproduce

Change nothing in configuration except for nixpkgs version and stateVersion.

Expected behavior

Subsequent nixos-rebuild, nix-collect-garbage and even writing short script files in home to take the same time. Saving a single file now takes >10s sometimes. Garbage collection didn't finish after a whole night even though it took less than few minutes before switch.

Additional context

Configuration https://gitlab.com/vfosnar/nixos

Metadata

• system: "x86_64-linux"
• host os: Linux 6.11.7, NixOS, 24.11 (Vicuna), 24.11.20241116.057f63b
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.24.10
• nixpkgs: /nix/store/idq1bmwwy9rlkc21hccvx42wlwpxsx1f-source

from fastfetch:

• Host: ASUS Vivobook S 15 S5506MA_S5506MA (1.0)
• CPU: Intel(R) Core(TM) Ultra 7 155H (22) @ 4.80 GHz
• Memory: 4.07 GiB / 15.23 GiB (27%)
• Swap: Disabled
• Disk (/): 464.77 GiB / 920.82 GiB (50%) - ext4