netdev - RE: big picture UDP/IP performance question re 2.6.18 -> 2.6.32

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Message-ID: <D3F292ADF945FB49B35E96C94C2061B91400C5F6@nsmail.netscout.com>
Date:	Tue, 4 Oct 2011 15:54:50 -0400
From:	"Loke, Chetan" <Chetan.Loke@...scout.com>
To:	<starlight@...nacle.cx>, "Eric Dumazet" <eric.dumazet@...il.com>
Cc:	<linux-kernel@...r.kernel.org>, "netdev" <netdev@...r.kernel.org>,
	"Willy Tarreau" <w@....eu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Subject: RE: big picture UDP/IP performance question re 2.6.18  -> 2.6.32

> Sometimes I think it might be nice to run without
> an OS at all :-)
> 
> We are looking at various kernel bypass approaches
> for receiving packets and it's in my mind that
> one of these may get us to running on newer
> kernels without giving up performance.
> 

If permissible in your environment, try running PACKET:tpacket_v3.

Also, I always wondered about the following in the output of:

net/ptype
dada          edsa_rcv+0x0/0x246
001b          dsa_rcv+0x0/0x225

and so when I'm fine tuning apps in virtual environments I nuke the
above during kernel compilation.


Chetan Loke
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