netdev - Re: RPS and forwarding

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Message-ID: <20100426045316.GA21810@gondor.apana.org.au>
Date:	Mon, 26 Apr 2010 12:53:16 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Tom Herbert <therbert@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: RPS and forwarding

On Sun, Apr 25, 2010 at 09:44:05PM -0700, Tom Herbert wrote:
> 
> I think you'd want RPS on router (steering packets using hash and CPU
> mask).  Most of your concerns are about RFS (steering by flows), which
> is probably more appropriate for a server.

Right.  The problem is that if you run a distribution kernel on
a router with CONFIG_RPS (and hence RFS) enabled, you may suddenly
start seeing packet reordering on forwarded traffic due to the
presence of local traffic.

Can we perhaps add a run-time toggle to disable RFS?

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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