* TX critical path. We have room for 8 bytes and still all placed
* in a cache line. We are not using the threshold values below nor
* the txq_flags but if we need to, we can add the most used in the
* TX critical path. We have room for 8 bytes and still all placed
* in a cache line. We are not using the threshold values below nor
* the txq_flags but if we need to, we can add the most used in the