From 6e2f93478bb9f72f547c75884afa8919004d26da Mon Sep 17 00:00:00 2001
From: Valentin Brandl <mail@vbrandl.net>
Date: Sun, 3 Dec 2023 14:02:35 +0100
Subject: [PATCH] Disable dm-crypt workqueues for better SSD performance

---
 machines/morpheus.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/machines/morpheus.nix b/machines/morpheus.nix
index bb5d77d..7cb48df 100644
--- a/machines/morpheus.nix
+++ b/machines/morpheus.nix
@@ -73,7 +73,12 @@ inputs.nixpkgs.lib.nixosSystem {
           #availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "nvme" "usbhid" "usb_storage" "sd_mod" ];
           availableKernelModules = [ "nvme" "xhci_pci" "usb_storage" "sd_mod" ];
           kernelModules = [ ];
-          luks.devices."system".device = "/dev/disk/by-uuid/06549d22-b96c-44f2-bb27-45200d5feda5";
+          luks.devices."system" = {
+            device = "/dev/disk/by-uuid/06549d22-b96c-44f2-bb27-45200d5feda5";
+            # better SSD performance
+            # https://wiki.archlinux.org/title/Dm-crypt/Specialties#Disable_workqueue_for_increased_solid_state_drive_(SSD)_performance
+            bypassWorkqueues = true;
+          };
         };
         kernelModules = [ "kvm-amd" ];
         # use latest kernel