The improvement is often more significant when pod to pod traffic is being encapsulated (IP in IP, VXLAN, or WireGuard), and splitting and combining such traffic cannot be offloaded to your NICs.īy default, Calico will auto-detect the correct MTU for your cluster based on node configuration and enabled networking modes. Maximum bandwidth increases and CPU consumption may drop for a given traffic rate. In general, maximum performance is achieved by using the highest MTU value that does not cause fragmentation or dropped packets on the path. MTU is configured on the veth attached to each workload, and tunnel devices (if you enable IP in IP, VXLAN, or WireGuard). The maximum transmission unit (MTU) setting determines the largest packet size that can be transmitted through your network. This how-to guide uses the following Calico features: Increasing the MTU can improve performance, and decreasing the MTU can resolve packet loss and fragmentation problems when it is too high. Optimize network performance for workloads by configuring the MTU in Calico to best suit your underlying network. Configure the maximum transmission unit (MTU) for your Calico environment.
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