netdev - Re: [PATCH 2/2] packet: Add fanout support.

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Message-ID: <4E135921.1060606@inliniac.net>
Date:	Tue, 05 Jul 2011 20:34:09 +0200
From:	Victor Julien <victor@...iniac.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"Loke, Chetan" <Chetan.Loke@...scout.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] packet: Add fanout support.

On 07/05/2011 08:26 PM, Eric Dumazet wrote:
>>>> What about a hashing scheme based on just the ip addresses? Would make
>>>> rxhash useless for this purpose, but would be a lot simpler overall maybe...
>>>>
>>>
>>> What about loads where a single IP address is used ?
>>
>> How would that be a problem?
> 
> Say I want my program able to process 2.000.000 packets per second on my
> 64 cpu machine, but one cpu is only able to process 100.000 pps.
> 
> All these packets are coming from IP1, and go to IP2, but thousand of
> different flows are in flight.
> 
> We need hash function taking into account source port and destination
> port.

Point taken. I see no other way either.

-- 
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Victor Julien
http://www.inliniac.net/
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