Messages in this thread | | | Subject | Re: is CONFIG_PACKET_MMAP always a win? | From | Gianni Tedesco <> | Date | 22 Feb 2002 08:37:12 +0000 |
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On Fri, 2002-02-22 at 06:45, Ben Greear wrote: > > > 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.
Yeah I found it a bit lacking too, I got there in the end though. Check out: http://www.scaramanga.co.uk/code-fu/lincap.c
-- // Gianni Tedesco <gianni@ecsc.co.uk> 80% of all email is a figment of procmails imagination.
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