netdev - Re: RPS and forwarding

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Message-ID: <1272267534.2346.7.camel@edumazet-laptop>
Date:	Mon, 26 Apr 2010 09:38:54 +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 15:30 +0800, Herbert Xu a écrit :
> On Mon, Apr 26, 2010 at 09:25:16AM +0200, Eric Dumazet wrote:
> >
> > 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.
> 
> I was referring to the case when a forwarded flow gets hashed to
> the same index as a local flow.

Ah OK, with same rxhash I guess ?

(we could store rxhash next to cpu in struct rps_dev_flow, or 16bit part
of it in the existing padding)



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