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It is unclear from the datasheets whether or not the TX ring can be completely filled (i.e. whether writing the tail value as equal to the current head value will cause the ring to be treated as completely full or completely empty). It is very plausible that this edge case could differ in behaviour between real hardware and the many implementations of an emulated Intel NIC found in various virtual machines. Err on the side of caution and always leave at least one ring entry empty. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE README File Quick start guide: cd src make For any more detailed instructions, see http://ipxe.org