From ee4794859a9f2bb6178cfac5abafcfded0c017d1 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Thu, 2 Apr 2026 22:02:40 -0400
Subject: [PATCH] Update packages.

---
 nix/configuration/configuration.nix                 |  8 +++++++-
 nix/configuration/flake.lock                        | 12 ++++++------
 nix/configuration/roles/optimized_build/default.nix | 10 ++++++++--
 nix/configuration/roles/recovery/default.nix        |  2 +-
 4 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/nix/configuration/configuration.nix b/nix/configuration/configuration.nix
index 2bccc34d..74fa2282 100644
--- a/nix/configuration/configuration.nix
+++ b/nix/configuration/configuration.nix
@@ -224,7 +224,13 @@
         (disableTests "coreutils-full")
         (disableTests "libuv")
         (final: prev: {
-          inherit (final.unoptimized) libtpms libjxl;
+          inherit (final.unoptimized)
+            libtpms
+            libjxl
+            ddrescueview
+            deno
+            mesa
+            ;
         })
         (disableOptimizationsPython3 "scipy")
         # Works but probably sets python2's scipy to be python3:
diff --git a/nix/configuration/flake.lock b/nix/configuration/flake.lock
index 28ca666d..c098f66b 100644
--- a/nix/configuration/flake.lock
+++ b/nix/configuration/flake.lock
@@ -22,11 +22,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1769524058,
-        "narHash": "sha256-zygdD6X1PcVNR2PsyK4ptzrVEiAdbMqLos7utrMDEWE=",
+        "lastModified": 1773889306,
+        "narHash": "sha256-PAqwnsBSI9SVC2QugvQ3xeYCB0otOwCacB1ueQj2tgw=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "71a3fc97d80881e91710fe721f1158d3b96ae14d",
+        "rev": "5ad85c82cc52264f4beddc934ba57f3789f28347",
         "type": "github"
       },
       "original": {
@@ -164,11 +164,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1770197578,
-        "narHash": "sha256-AYqlWrX09+HvGs8zM6ebZ1pwUqjkfpnv8mewYwAo+iM=",
+        "lastModified": 1775036866,
+        "narHash": "sha256-ZojAnPuCdy657PbTq5V0Y+AHKhZAIwSIT2cb8UgAz/U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "00c21e4c93d963c50d4c0c89bfa84ed6e0694df2",
+        "rev": "6201e203d09599479a3b3450ed24fa81537ebc4e",
         "type": "github"
       },
       "original": {
diff --git a/nix/configuration/roles/optimized_build/default.nix b/nix/configuration/roles/optimized_build/default.nix
index d8a103be..3fc944da 100644
--- a/nix/configuration/roles/optimized_build/default.nix
+++ b/nix/configuration/roles/optimized_build/default.nix
@@ -79,9 +79,15 @@
               in
               {
                 linux_me = addConfig {
-                  # Full preemption
-                  PREEMPT = lib.mkOverride 60 lib.kernel.yes;
+                  # Server | No preemption - Run until the next tick. Highest throughput but can cause stutter.
+                  # PREEMPT = lib.mkOverride 60 lib.kernel.no;
+                  # Desktop | Preempt kernel threads only at pre-defined places that call cond_resched().
                   PREEMPT_VOLUNTARY = lib.mkOverride 60 lib.kernel.no;
+                  # Low-latency desktop | Full preemption - Kernel threads can be preempted unless they hold a spinlock or are in a no-preemption section.
+                  PREEMPT = lib.mkOverride 60 lib.kernel.yes;
+                  # RT - All kernel code is preemptible except for a few critical sections.
+                  # Middle ground | Real-time tasks preempt immediately like FULL, normal tasks run until the next tick.
+                  PREEMPT_LAZY = lib.mkOverride 90 lib.kernel.no;
 
                   # Google's BBRv3 TCP congestion Control
                   TCP_CONG_BBR = lib.kernel.yes;
diff --git a/nix/configuration/roles/recovery/default.nix b/nix/configuration/roles/recovery/default.nix
index 1c46e07b..14953642 100644
--- a/nix/configuration/roles/recovery/default.nix
+++ b/nix/configuration/roles/recovery/default.nix
@@ -29,7 +29,7 @@
       }
       (lib.mkIf config.me.graphical {
         environment.systemPackages = with pkgs; [
-          ddrescueview
+          #ddrescueview
         ];
       })
     ]