From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: RE: Scaling problem with a lot of AF_PACKET sockets on different
 interfaces
Date: Fri, 07 Jun 2013 07:30:20 -0700
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Cc: Mike Galbraith <bitbucket@online.de>,
	"Vitaly V. Bursov" <vitalyb@telenet.dn.ua>,
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To: David Laight <David.Laight@ACULAB.COM>
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On Fri, 2013-06-07 at 15:09 +0100, David Laight wrote:
> > > Looks like the ptype_base[] should be per 'dev'?
> > > Or just put entries where ptype->dev != null_or_dev on a per-interface
> > > list and do two searches?
> > 
> > Yes, but then we would have two searches instead of one in fast path.
> 
> Usually it would be empty - so the search would be very quick!

quick + quick + quick + quick + quick == not so quick ;)

Plus adding another code for /proc/net/packet

Plus adding the xmit side (AF_PACKET captures receive and xmit)