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

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Message-ID: <1299054277.2930.89.camel@edumazet-laptop>
Date:	Wed, 02 Mar 2011 09:24:37 +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 16:07 +0800, Herbert Xu a écrit :
> On Wed, Mar 02, 2011 at 09:04:08AM +0100, Eric Dumazet wrote:
> > 
> > Not sure why two UDP packets from the same cpu should be sent on same
> > queue.
> > 
> > - Some qdisc do reorder packets anyway.
> 
> Which qdisc reorders packets belonging to the same flow?
> 

Hmm to be fair you did not specified "same flow", and /sbin/named
answers are usually one packet long...

How are we going to detect flows in sendto() calls ?

Just kidding.

If you want to push your patch, I suspect a dynamic per_cpu variable is
needed per TX-multiqueue device, so that "current cpu -> txq number" is
one instruction.



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