# /etc/systemd/system/ptp_nic_coalesce.service

[Unit]
Description=NIC coalesce minimize
Requires=network.target
After=network.target

[Service]
ExecStart=/usr/sbin/ethtool -C eth0 tx-usecs 4 rx-usecs 4
Type=oneshot

[Install]
WantedBy=multi-user.target