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

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Date:	Wed, 1 Dec 2010 16:03:01 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Rui <wirelesser@...il.com>
Subject: Re: [PATCH net-next-2.6] filter: add SKF_AD_RXHASH and SKF_AD_CPU

On Wed, Dec 1, 2010 at 3:45 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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>
> Cc: Rui <wirelesser@...il.com>

Acked-by: Changli Gao <xiaosuo@...il.com>

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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