From cbf13b8f5c3c801cda35af49607fa9d3d0a88e36 Mon Sep 17 00:00:00 2001
From: Hutch-45D <mhutchinson@45drives.com>
Date: Wed, 6 May 2026 09:57:29 -0300
Subject: [PATCH 1/2] Add network-tunings.sh for NIC RX tuning

Add a new script that detects physical network interfaces and configures ethtool RX ring sizes (preferring 4096, falling back to 2047). The script sets net.core.netdev_budget, writes a persistent sysctl file (/etc/sysctl.d/99-netdev-budget.conf), and generates a NetworkManager dispatcher script (/etc/NetworkManager/dispatcher.d/45-ethtool) to reapply RX settings on interface up. It validates changes, creates backups of existing dispatcher/sysctl files, and requires root and ethtool to run.
---
 network-tunings.sh | 122 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)
 create mode 100644 network-tunings.sh

diff --git a/network-tunings.sh b/network-tunings.sh
new file mode 100644
index 0000000..a746903
--- /dev/null
+++ b/network-tunings.sh
@@ -0,0 +1,122 @@
+#!/bin/bash
+set -euo pipefail
+
+NETDEV_BUDGET="600"
+PREFERRED_RX="4096"
+FALLBACK_RX="2047"
+
+DISPATCHER_SCRIPT="/etc/NetworkManager/dispatcher.d/45-ethtool"
+SYSCTL_FILE="/etc/sysctl.d/99-netdev-budget.conf"
+
+if [[ $EUID -ne 0 ]]; then
+  echo "Run this as root."
+  exit 1
+fi
+
+command -v ethtool >/dev/null || {
+  echo "ethtool is not installed. Install it first."
+  exit 1
+}
+
+get_physical_interfaces() {
+  for path in /sys/class/net/*; do
+    iface="$(basename "$path")"
+
+    [[ "$iface" == "lo" ]] && continue
+    [[ -d "$path/device" ]] || continue
+
+    echo "$iface"
+  done
+}
+
+detect_rx_size() {
+  local iface="$1"
+
+  if ethtool -G "$iface" rx "$PREFERRED_RX" >/dev/null 2>&1; then
+    echo "$PREFERRED_RX"
+  elif ethtool -G "$iface" rx "$FALLBACK_RX" >/dev/null 2>&1; then
+    echo "$FALLBACK_RX"
+  else
+    echo ""
+  fi
+}
+
+echo "Detecting physical interfaces..."
+mapfile -t INTERFACES < <(get_physical_interfaces)
+
+if [[ ${#INTERFACES[@]} -eq 0 ]]; then
+  echo "No physical interfaces found."
+  exit 1
+fi
+
+echo "Found interfaces: ${INTERFACES[*]}"
+echo
+
+echo "Testing and applying RX ring settings..."
+
+declare -A RX_SIZE_BY_IFACE
+
+for iface in "${INTERFACES[@]}"; do
+  rx_size="$(detect_rx_size "$iface")"
+
+  if [[ -n "$rx_size" ]]; then
+    RX_SIZE_BY_IFACE["$iface"]="$rx_size"
+    echo "$iface: using RX ring size $rx_size"
+  else
+    echo "$iface: could not set RX ring to $PREFERRED_RX or $FALLBACK_RX, skipping"
+  fi
+done
+
+echo
+echo "Setting net.core.netdev_budget=$NETDEV_BUDGET"
+sysctl -w net.core.netdev_budget="$NETDEV_BUDGET"
+
+echo
+echo "Writing static dispatcher script: $DISPATCHER_SCRIPT"
+
+[[ -f "$DISPATCHER_SCRIPT" ]] && cp "$DISPATCHER_SCRIPT" "$DISPATCHER_SCRIPT.bak"
+
+cat > "$DISPATCHER_SCRIPT" <<'EOF'
+#!/bin/bash
+EOF
+
+for iface in "${INTERFACES[@]}"; do
+  rx_size="${RX_SIZE_BY_IFACE[$iface]:-}"
+
+  [[ -z "$rx_size" ]] && continue
+
+  cat >> "$DISPATCHER_SCRIPT" <<EOF
+if [ "\$1" == "$iface" ] && [ "\$2" == "up" ]; then
+    ethtool -G "$iface" rx "$rx_size"
+fi
+
+EOF
+done
+
+chmod +x "$DISPATCHER_SCRIPT"
+
+echo "Writing persistent sysctl config: $SYSCTL_FILE"
+
+[[ -f "$SYSCTL_FILE" ]] && cp "$SYSCTL_FILE" "$SYSCTL_FILE.bak"
+
+cat > "$SYSCTL_FILE" <<EOF
+net.core.netdev_budget=$NETDEV_BUDGET
+EOF
+
+sysctl --system >/dev/null
+
+echo
+echo "Validating applied settings..."
+ACTUAL_BUDGET="$(sysctl -n net.core.netdev_budget)"
+if [[ "$ACTUAL_BUDGET" == "$NETDEV_BUDGET" ]]; then
+  echo "✓ net.core.netdev_budget correctly set to $NETDEV_BUDGET"
+else
+  echo "✗ Warning: net.core.netdev_budget is $ACTUAL_BUDGET (expected $NETDEV_BUDGET)"
+fi
+
+echo
+echo "Done."
+echo "Dispatcher script created at: $DISPATCHER_SCRIPT"
+echo "Sysctl persistence created at: $SYSCTL_FILE"
+[[ -f "$DISPATCHER_SCRIPT.bak" ]] && echo "Backup saved at: $DISPATCHER_SCRIPT.bak"
+[[ -f "$SYSCTL_FILE.bak" ]] && echo "Backup saved at: $SYSCTL_FILE.bak"
\ No newline at end of file

From 623b9caa8440775a48edcb9f2aa070debadab628 Mon Sep 17 00:00:00 2001
From: Hutch-45D <91276381+Hutch-45D@users.noreply.github.com>
Date: Thu, 7 May 2026 08:48:20 -0300
Subject: [PATCH 2/2] Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
---
 network-tunings.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/network-tunings.sh b/network-tunings.sh
index a746903..fbf1559 100644
--- a/network-tunings.sh
+++ b/network-tunings.sh
@@ -103,7 +103,9 @@ cat > "$SYSCTL_FILE" <<EOF
 net.core.netdev_budget=$NETDEV_BUDGET
 EOF
 
-sysctl --system >/dev/null
+if ! sysctl -p "$SYSCTL_FILE" >/dev/null; then
+  echo "Warning: failed to apply sysctl settings from $SYSCTL_FILE" >&2
+fi
 
 echo
 echo "Validating applied settings..."