netdev - Re: RPS and forwarding

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Date:	Mon, 26 Apr 2010 09:25:16 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.hengli.com.au>
Cc:	David Miller <davem@...emloft.net>, therbert@...gle.com,
	netdev@...r.kernel.org
Subject: Re: RPS and forwarding

Le lundi 26 avril 2010 à 14:31 +0800, Herbert Xu a écrit :
> On Sun, Apr 25, 2010 at 11:28:57PM -0700, David Miller wrote:

> 
> > It might be possible to somehow make the sock table get bypassed for
> > forwarded traffic, but I can't think of a cheap way to do that at
> > the moment.
> 
> Yeah I thought about that too but as we need to go through the
> routing table before we know whether something is forwarded or
> not, it certainly seems non-trivial.
> 
> Hmm, maybe if we used a routing cache keyed by rxhash we could
> make an appromixation? After all, we only need to make sure that
> no forwarded traffic is redirected, and not the reverse.  IOW,
> it's OK if we incorrectly classify some local traffic as forwarded.
> 

RFS is already working like that, if RPS is not used in conjonction.

Forwarded traffic will see a non tagged rfs flow entry, so this skb will
be processed by this cpu, not a remote one.

Currently, only an application can set a RFS flow entry.



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