From 2613af0ed18a11d5c566a81f9a6510b73180660a Mon Sep 17 00:00:00 2001
From: Michael Dalton <mwdalton@google.com>
Date: Mon, 28 Oct 2013 15:44:18 -0700
Subject: [PATCH] virtio_net: migrate mergeable rx buffers to page frag
 allocators

The virtio_net driver's mergeable receive buffer allocator
uses 4KB packet buffers. For MTU-sized traffic, SKB truesize
is > 4KB but only ~1500 bytes of the buffer is used to store
packet data, reducing the effective TCP window size
substantially. This patch addresses the performance concerns
with mergeable receive buffers by allocating MTU-sized packet
buffers using page frag allocators. If more than MAX_SKB_FRAGS
buffers are needed, the SKB frag_list is used.

Signed-off-by: Michael Dalton <mwdalton@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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