MIN_BUFFERS_ARM_COUNT
while (rx_ring->sbuf_free_count > MIN_BUFFERS_ARM_COUNT) {
while (rx_ring->lbuf_free_count > MIN_BUFFERS_ARM_COUNT) {
if (rx_ring->sbuf_free_count > rx_ring->sbq_len-MIN_BUFFERS_ARM_COUNT)
arm_count = (rx_ring->sbq_len-MIN_BUFFERS_ARM_COUNT);
if (rx_ring->lbuf_free_count > rx_ring->lbq_len-MIN_BUFFERS_ARM_COUNT)
arm_count = (rx_ring->lbq_len-MIN_BUFFERS_ARM_COUNT);
#define RX_COPY_MODE_THRESHOLD (MIN_BUFFERS_ARM_COUNT/4)