netdev - Re: flow director and packet ordering

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Message-Id: <20090705.155354.85683961.davem@davemloft.net>
Date:	Sun, 05 Jul 2009 15:53:54 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	peter.p.waskiewicz.jr@...el.com, netdev@...r.kernel.org,
	jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com
Subject: Re: flow director and packet ordering

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sun, 5 Jul 2009 12:19:55 +0800

> David Miller <davem@...emloft.net> wrote:
>>
>> In the meantime you cannot switch the RX queue mapping without
>> introducing reordering.
>> 
>> So my original fears and doubts still stand :-)
> 
> Methinks this whole idea is doomed.  The fact is as long as there
> are more sockets than queues, then you can have two sockets pull
> the same queue in different directions and there's nothing you can
> do about that.
> 
> That's my bit of uncertainty for you :)

Flows map to queues, queues don't move.  Rather the mapping between
flows and queues changes dynamically.
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