[dpdk-dev] igb PMD should set the default tx wthresh correctly.

[Stephen Hemminger]

Why doesn't igb driver set the wthresh it wants as default?

I see:
	PMD: eth_igb_tx_queue_setup(): To improve 1G driver performance, consider setting the TX WTHRESH value to 4, 8, or 16.

But the default tx_conf has wthresh of 0.

	#define IGB_DEFAULT_TX_WTHRESH      0


Either message should be removed or default TX wthresh should change.