From 621d209680f07c63e991c32c21aeb4a758755163 Mon Sep 17 00:00:00 2001
From: Simon Bruder <simon@sbruder.de>
Date: Wed, 9 Jun 2021 15:22:17 +0200
Subject: [PATCH] sayuri: Add specialisation that disables mitigations

x264 encodes over 2 times faster in one example with mitigations
disabled.
---
 machines/sayuri/configuration.nix | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/machines/sayuri/configuration.nix b/machines/sayuri/configuration.nix
index 3279e74..47f69b4 100644
--- a/machines/sayuri/configuration.nix
+++ b/machines/sayuri/configuration.nix
@@ -1,4 +1,4 @@
-{ config, pkgs, ... }:
+{ config, lib, pkgs, ... }:
 
 {
   imports = [
@@ -44,5 +44,23 @@
         user = "sbruder";
       };
     };
+    intel-sucks.configuration = {
+      # https://make-linux-fast-again.com/
+      boot.kernelParams = [
+        "l1tf=off"
+        "mds=off"
+        "mitigations=off"
+        "no_stf_barrier"
+        "noibpb"
+        "noibrs"
+        "nopti"
+        "nospec_store_bypass_disable"
+        "nospectre_v1"
+        "nospectre_v2"
+        "tsx=on"
+        "tsx_async_abort=off"
+      ];
+      sbruder.gui.enable = lib.mkForce false;
+    };
   };
 }