From 8e845f4cbbd2ef81846c2ab5dca46d88fb2717ee Mon Sep 17 00:00:00 2001
From: David L Stevens <david.stevens@oracle.com>
Date: Mon, 29 Sep 2014 19:48:11 -0400
Subject: [PATCH] sunvnet: make transmit path zero-copy in the kernel

This patch removes pre-allocated transmit buffers and instead directly maps
pending packets on demand. This saves O(n^2) maximum-sized transmit buffers,
for n hosts on a vswitch, as well as a copy to those buffers.

Single-stream TCP throughput linux-solaris dropped ~5% for 1500-byte MTU,
but linux-linux at 1500-bytes increased ~20%.

Signed-off-by: David L Stevens <david.stevens@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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