netdev - Re: [PATCH net-next] virtio_net: migrate mergeable rx buffers to page frag allocators

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Message-ID: <526F642D.5010706@redhat.com>
Date:	Tue, 29 Oct 2013 08:30:53 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Michael Dalton <mwdalton@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org,
	Francesco Fusco <ffusco@...hat.com>
Subject: Re: [PATCH net-next] virtio_net: migrate mergeable rx buffers to
 page frag allocators

On 10/29/2013 12:19 AM, Eric Dumazet wrote:
> 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@...gle.com>
>> ---
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>
> Daniel & Francesco, this should address the performance problem you
> tried to address with ("tcp: rcvbuf autotuning improvements")

That's awesome, thanks everyone !

> ( http://www.spinics.net/lists/netdev/msg252642.html )
>
> Thanks !
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