On Thu, 2013-07-25 at 22:52 +0800, Ming Lei wrote: > Maybe need to try it with TSO enabled, in my test on ax88179_178a NIC after > applying your disabling TSO patch, tx throughput is less than 600Mbps, but rx > is close to 900Mbps. It looks like TCP stack could for this case allocate linear skbs (GFP_KERNEL context), using order-3 pages, and not adding frags on them, to avoid the skb_linearize() hazard (in GFP_ATOMIC) In case of retransmits, skb are small (one MSS) so the skb_linearize() should succeed most of the time. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
