This patch induces a new sock flag ZEROCOPY to avoid copy between userspace and kernel. macvtap is the first user of zero copy between guest and host kernel. It only uses when the lower device supports high memory DMA. The first set of patch only addresses transmission TX side. The test has shown big improvement on either CPU utilization reduction or BW increase on 10GbE Intel NIC. Performance data will be submitted in the coming email.
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