The number of 'slices' into which transmit resources are divided. This
determines the resolution with which transmit priority can be allocated
to each of the transmit queues. For example, if the number of slices
is 16, then transmit resources may be allocated to each transmit queue
in units of 1/16 (6.25% of the total). The numbers of slices allocated
to all queues must add up to the value of this object (i.e., 100%).