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SubjectRe: is CONFIG_PACKET_MMAP always a win?


David S. Miller wrote:

> From: Dan Kegel <dank@kegel.com>
> Date: Thu, 21 Feb 2002 17:51:20 -0800
>
> What's the best way to retrieve raw packets from the kernel?
>
> a) use libpcap
> ...
> b) use af_packet
> ...
> c) enable CONFIG_PACKET_MMAP, use PACKET_RX_RING
>
> If I understand it right, b costs one memcpy and one recv, and c costs
> two memcpys. Which one wins?
>
> "a" should be doing "c" when it is available in the kernel.
> If not, get a newer copy of the libpcap sources, preferably
> from Alexey's site:
>
> ftp.inr.ac.ru:/ip-routing/


And if you can figure out how to do c, and feel like
sharing, please do let me know! Documentation is a
bit sparse..at least wherever I've been looking.

Enjoy,
Ben



--
Ben Greear <greearb@candelatech.com> <Ben_Greear AT excite.com>
President of Candela Technologies Inc http://www.candelatech.com
ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear


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