netdev - Re: kenel level packet capturing

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Date:	Wed, 14 Dec 2011 14:31:25 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	raviraj joshi <raviraj.j1991@...il.com>
cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org
Subject: Re: kenel level packet capturing


On Wednesday 2011-12-14 11:46, raviraj joshi wrote:
>On Wed, Dec 14, 2011 at 12:06 AM, David Miller wrote:
>>
>>>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 has had mmap support for a loooong time. The initial code
traces back to 2.3.15pre3 (1999-Aug-23).
So much for $academia.

>[1]
>http://www.cs.wustl.edu/~jain/cse567-11/ftp/pkt_recp/index.html
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