5.2. Network Tuning Tips
- Use multiple networks to avoid congestion on a single network. For example, have dedicated networks for management, backups and/or live migration.
- Usually, matching the default MTU (1500 bytes) in all components is sufficient. If you require larger messages, increasing the MTU value can reduce fragmentation. If you change the MTU, all devices in the path should have a matching MTU value.
arp_filterto prevent ARP Flux, an undesirable condition that can occur in both hosts and guests and is caused by the machine responding to ARP requests from more than one network interface:
echo 1 > /proc/sys/net/ipv4/conf/all/arp_filteror edit
/etc/sysctl.confto make this setting persistent.