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

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Message-ID: <20110302030902.GA16416@gondor.apana.org.au>
Date:	Wed, 2 Mar 2011 11:09:02 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Thomas Graf <tgraf@...radead.org>,
	David Miller <davem@...emloft.net>, rick.jones2@...com,
	therbert@...gle.com, wsommerfeld@...gle.com,
	daniel.baluta@...il.com, netdev@...r.kernel.org
Subject: Re: SO_REUSEPORT - can it be done in kernel?

On Wed, Mar 02, 2011 at 03:56:38AM +0100, Eric Dumazet wrote:
>
> Anyway, the SYN-ACK is generated by softirq, not really user choice.
> CPU depends if NIC is RX multiqueue or RPS is setup.

Which is exactly what we want.  The RX queue selection should
determine the TX cpu.

> All this discussion is about letting process scheduler decide TX queue,
> (because user/admin used cpu affinity) or let network stack drive
> scheduler : Please migrate this thread on this cpu.
> 
> Both schems should be allowed/configurable so that best results are
> available.

Whatever scheme we end up with, hashing different sockets running
in the same thread to different queues is just broken.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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