From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Mon, 28 Oct 2013 16:19:49 -0700
> On Mon, 2013-10-28 at 15:44 -0700, Michael Dalton wrote:
>> 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@xxxxxxxxxx>
>> ---
>
> Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
>
> Daniel & Francesco, this should address the performance problem you
> tried to address with ("tcp: rcvbuf autotuning improvements")
>
> ( http://www.spinics.net/lists/netdev/msg252642.html )
Applied, thanks everyone.
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