x11-drivers/nvidia-drivers: Enable persistence mode by default

nvidia-persistenced keeps a reference to the GPU open at all times,
which allows applications/containerd accessing gpus to start faster.

Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>

sdk_container/src/third_party/coreos-overlay/x11-drivers/nvidia-drivers/files/bin/setup-nvidia

@@ -9,6 +9,8 @@ set -euo pipefail
 NVIDIA_DOWNLOAD_BASEURL="https://us.download.nvidia.com/${NVIDIA_PRODUCT_TYPE}/"
 NVIDIA_DRIVER_BASENAME="NVIDIA-Linux-x86_64-${NVIDIA_DRIVER_VERSION}"
 NVIDIA_WORKDIR='nvidia-workdir'
+# User can disable
+: ${NVIDIA_PERSISTENCE_MODE:=on}
 
 FLATCAR_DEVELOPER_CONTAINER="flatcar_developer_container-${FLATCAR_RELEASE_VERSION}.bin"
 FLATCAR_DEVELOPER_CONTAINER_URL=""
@@ -128,6 +130,10 @@ function install_and_load() {
     D=`grep nvidia-uvm /proc/devices | awk '{print $1}'`
     mknod -m 666 /dev/nvidia-uvm c $D 0
   fi
+
+  if [ "${NVIDIA_PERSISTENCE_MODE}" = "on" ]; then
+    nvidia-persistenced
+  fi
 }
 
 function verify_installation() {