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Inside a virtual machine, writing the RX ring tail pointer may incur a substantial overhead of processing inside the hypervisor. Minimise this overhead by writing the tail pointer once per batch of descriptors, rather than once per descriptor. Profiling under qemu-kvm (version 1.6.2) shows that this reduces the amount of time taken to refill the RX descriptor ring by around 90%. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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