5/2/2023 0 Comments Tcp checksum offloadThe packets involved are the simplest case: 14-byte ethernet headers w/ type 0x800, 20-byte ipv4 headers, TCP (SYN,ACK) packet with some options. The inbound tcp->checksum is known to be zero. Mb->ol_flags = PKT_TX_TCP_CKSUM | PKT_TX_IPV4 RTE_PTYPE_L2_ETHER | RTE_PTYPE_INNER_元_IPV4 | RTE_PTYPE_INNER_L4_TCP If (b->flags & VLIB_BUFFER_TCP_CHECKSUM_OFFLOAD) In addition to the typical struct rte_mbuf setup, I add the following: I’m having a hard time trying to convince an Intel Fortville (i40e) PMD / NIC to compute and insert TCP correct TCP checksums. Xmit function with offload enabled, are you computing the Multiple trials wireshark reports a constant checksum errorĪssuming that you are not using vector functions but the default Headers, TCP (SYN,ACK) packet with some options. ![]() RTE_PTYPE_INNER_元_IPV4 | RTE_PTYPE_INNER_L4_TCP Ĭase: 14-byte ethernet headers w/ type 0x800, 20-byte ipv4 KBA is applicable for On-premise Organizations ONLY.Convince an Intel Fortville (i40e) PMD / NIC to compute and VMware Knowledge Base: Poor network performance or high network latency on Windows Virtual Machines Please refer to the following article for additional information. Netsh int tcp set global chimney=disabled To disable it, run this command in an elevated command prompt: To check if it is enabled, you can run the same command as for Receive-Side Scaling in an elevated command prompt: ![]() Similar to Receive-Side Scaling and the Checksum Offload features, the Chimney Offload feature may also affects the web traffic performance. Once completed, reboot the machine to apply the changes. To disable the feature, run this command in an elevated command prompt: To check if it is enabled, run the following command in an elevated command prompt: If enabled, the Receive-Side Scaling feature can have a negative impact on network traffic.
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