netdev - Re: SO_REUSEPORT - can it be done in kernel?

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Date:	Wed, 02 Mar 2011 09:04:08 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Tom Herbert <therbert@...gle.com>,
	Thomas Graf <tgraf@...radead.org>,
	David Miller <davem@...emloft.net>, rick.jones2@...com,
	wsommerfeld@...gle.com, daniel.baluta@...il.com,
	netdev@...r.kernel.org
Subject: Re: SO_REUSEPORT - can it be done in kernel?

Le mercredi 02 mars 2011 à 15:31 +0800, Herbert Xu a écrit :
> On Tue, Mar 01, 2011 at 11:12:29PM -0800, Tom Herbert wrote:
> >
> > Probably need to set skb->ooo_okay (for UDP etc.) also so that XPS
> > will change queues.
> 
> Hmm, not quite.  We still want to maintain packet ordering from
> the same CPU.  That is, if I do two sendmsg calls from the same
> CPU, they should go into the same queue in that order.
> 
> So this shouldn't just be a knob that says whether we can pick
> queues at random.
> 

Not sure why two UDP packets from the same cpu should be sent on same
queue.

- Some qdisc do reorder packets anyway.
- Some bonding setups use two links in round-robin mode (link
aggregation)


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