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Why the length of packet is more than the jumbo frames when the StorageGRID MTU is set as 1500?

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Applies to

StorageGRID 11.7.0

Answer

  • In the output of the command ethtool -k <ethx> this is attributable to the fact that Transmit Segmentation Offloading (TSO) and Large Receive Offload (LRO) are enabled on the NIC.

tcp-segmentation-offload: on
       tx-tcp-segmentation: on
       tx-tcp-ecn-segmentation: on
       tx-tcp-mangleid-segmentation: on
       tx-tcp6-segmentation: on
generic-segmentation-offload: on
generic-receive-offload: on
tx-vlan-offload: on

• Due to the enabled settings, the packet sizes in the trace may not match the MTU exactly. However, this should not affect performance or cause any issues, as the traces are captured above the NIC level.

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