netdev - Re: kenel level packet capturing

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Date:	Thu, 15 Dec 2011 13:19:33 -0200
From:	Eduardo Panisset <eduardo.panisset@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	raviraj.j1991@...il.com, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org
Subject: Re: kenel level packet capturing

Hi Raviraj,

You could be interested in taking a look at
"Documentation/networking/packet_mmap.txt" (this talks about mmap()'d
packet ring implementation for AF_PACKET).

Rgds,
Eduardo Panisset.

On Wed, Dec 14, 2011 at 2:09 PM, David Miller <davem@...emloft.net> wrote:
> From: raviraj joshi <raviraj.j1991@...il.com>
> Date: Wed, 14 Dec 2011 16:16:01 +0530
>
>> On Wed, Dec 14, 2011 at 12:06 AM, David Miller <davem@...emloft.net> wrote:
>>> From: raviraj joshi <raviraj.j1991@...il.com>
>>> Date: Tue, 13 Dec 2011 17:34:22 +0530
>>>
>>>> We have decided to use PF_RING(a kernel module to capture packets) for
>>>> the same due to the number of advantages.
>>>
>>> What "advantages"?  The AF_PACKET socket layer already upstream in the
>>> kernel supports every relevant performance feature PF_RING does, and
>>> then some.
>> I refered to the document on "A Measurement Study of Packet Reception
>> using Linux"[1]  which said pf_ring maintains
>> a ring buffer, so we dont have to issue a receive system call for each
>> packet in contrast to AF_PACKET which issues a system call for each
>> packet(pls correct me if i am wrong).
>
> AF_PACKET supports mmap()'d packet rings, and even supports variable
> packet lengths within those rings.
>
> AF_PACKET supports all the worthwhile performance features of PR_RING
> and it's upstream, stop kidding yourself.
>
> I'm really sick and tired of people saying PF_RING is better than
> what we have upstream, it really isn't.
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