diff --git a/ekman/c0/default.nix b/ekman/c0/default.nix
index 27fc964..f555b01 100644
--- a/ekman/c0/default.nix
+++ b/ekman/c0/default.nix
@@ -58,7 +58,7 @@ let
           os.networkmanager.enable = false;
           os.externalInterface = host.iface;
           hpc.computeNode = true;
-          hpc.knem = false;
+          hpc.knem = true;
         };
 
         # services.udev.extraRules = ''
@@ -128,6 +128,7 @@ let
           hw
           ../default.nix
           ../mounts.nix
+          ./kernel.nix
         ];
       };
     };
diff --git a/ekman/c0/kernel.nix b/ekman/c0/kernel.nix
index 6aaa81c..145161c 100644
--- a/ekman/c0/kernel.nix
+++ b/ekman/c0/kernel.nix
@@ -1,58 +1,58 @@
-{pkgs, lib, ...}:
+{ pkgs, lib, ... }:
 let
   kernel = pkgs.linuxPackages.kernel;
-  i40e =
-    pkgs.stdenv.mkDerivation rec {
-      name = "i40e-${version}-${kernel.version}";
-      version = "2.13.10";
+  i40e = pkgs.stdenv.mkDerivation rec {
+    name = "i40e-${version}-${kernel.version}";
+    version = "2.13.10";
 
-      src = pkgs.fetchFromGitHub {
-        owner = "dmarion";
-        repo = "i40e";
-        rev = "7228a7c3b362c3170baa2f9a9c6870a900e78dbd";
-        sha256 = "087kvq9wrc1iw6vig8cqcx7cb6346wx8qxzb85c3n8638vq1vrxr";
-      };
-
-      hardeningDisable = [ "pic" ];
-
-      configurePhase = ''
-        cd src
-        kernel_version=${kernel.modDirVersion}
-        sed -i -e 's|/lib/modules|${kernel.dev}/lib/modules|' Makefile
-        sed -i -e 's|/lib/modules|${kernel.dev}/lib/modules|' common.mk
-        export makeFlags="BUILD_KERNEL=$kernel_version"
-      '';
-
-      installPhase = ''
-        install -v -D -m 644 i40e.ko "$out/lib/modules/$kernel_version/kernel/drivers/net/i40e/i40e2.ko"
-      '';
-
-      dontStrip = true;
-
-      enableParallelBuilding = true;
-
-      meta = {
-        description = "Linux kernel drivers for Intel Ethernet adapters and LOMs (LAN On Motherboard)";
-        homepage = https://github.com/dmarion/i40e;
-        license = lib.licenses.gpl2;
-      };
+    src = pkgs.fetchFromGitHub {
+      owner = "dmarion";
+      repo = "i40e";
+      rev = "7228a7c3b362c3170baa2f9a9c6870a900e78dbd";
+      sha256 = "087kvq9wrc1iw6vig8cqcx7cb6346wx8qxzb85c3n8638vq1vrxr";
     };
+
+    hardeningDisable = [ "pic" ];
+
+    configurePhase = ''
+      cd src
+      kernel_version=${kernel.modDirVersion}
+      sed -i -e 's|/lib/modules|${kernel.dev}/lib/modules|' Makefile
+      sed -i -e 's|/lib/modules|${kernel.dev}/lib/modules|' common.mk
+      export makeFlags="BUILD_KERNEL=$kernel_version"
+    '';
+
+    installPhase = ''
+      install -v -D -m 644 i40e.ko "$out/lib/modules/$kernel_version/kernel/drivers/net/i40e/i40e2.ko"
+    '';
+
+    dontStrip = true;
+
+    enableParallelBuilding = true;
+
+    meta = {
+      description = "Linux kernel drivers for Intel Ethernet adapters and LOMs (LAN On Motherboard)";
+      homepage = "https://github.com/dmarion/i40e";
+      license = lib.licenses.gpl2;
+    };
+  };
 in
 {
   # i40e2 = i40e;
-  # boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux_5_10.override {
-  #   argsOverride = rec {
-  #     src = pkgs.fetchurl {
-  #           url = "mirror://kernel/linux/kernel/v5.x/linux-${version}.tar.xz";
-  #           sha256 = "1nzhl1y6avfl77fyqwjwy3qc6679gp92k0d3aarscrdydcml5yid";
-  #     };
-  #     version = "5.10.239";
-  #     modDirVersion = "5.10.239";
-  #     };
-  # });
-  boot.kernelPackages = pkgs.linuxKernel.packages.linux_5_10;
+  boot.kernelPackages = pkgs.linuxPackagesFor (
+    pkgs.linux_5_10.override {
+      argsOverride = rec {
+        src = pkgs.fetchurl {
+          url = "mirror://kernel/linux/kernel/v5.x/linux-${version}.tar.xz";
+          sha256 = "1nzhl1y6avfl77fyqwjwy3qc6679gp92k0d3aarscrdydcml5yid";
+        };
+        version = "5.10.239";
+        modDirVersion = "5.10.239";
+      };
+    }
+  );
+  # boot.kernelPackages = pkgs.linuxKernel.packages.linux_5_10;
   # overlay = self: super: {
-    # linuxPackages_5_4 = super.linuxPackages_5_4 // { inherit i40e; };
+  # linuxPackages_5_4 = super.linuxPackages_5_4 // { inherit i40e; };
   # };
 }
-