netdev - Re: [PATCH net-next-2.6] filter: add SKF_AD_RXHASH and SKF_AD

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Message-Id: <20101206.130252.232758553.davem@davemloft.net>
Date:	Mon, 06 Dec 2010 13:02:52 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, wirelesser@...il.com
Subject: Re: [PATCH net-next-2.6] filter: add SKF_AD_RXHASH and SKF_AD_CPU

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 01 Dec 2010 08:45:56 +0100

> Add SKF_AD_RXHASH and SKF_AD_CPU to filter ancillary mechanism,
> to be able to build advanced filters.
> 
> This can help spreading packets on several sockets with a fast
> selection, after RPS dispatch to N cpus for example, or to catch a
> percentage of flows in one queue.
> 
> tcpdump -s 500 "cpu = 1" :
> 
> [0] ld CPU
> [1] jeq #1  jt 2  jf 3 
> [2] ret #500
> [3] ret #0
> 
> # take 12.5 % of flows (average)
> tcpdump -s 1000 "rxhash & 7 = 2" :
> 
> [0] ld RXHASH
> [1] and #7
> [2] jeq #2  jt 3  jf 4 
> [3] ret #1000
> [4] ret #0
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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