netdev - Re: [PATCH net-next 6/6] sched: Eliminate use of flow_keys in sch

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Date:	Mon, 02 Mar 2015 11:43:17 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Florian Westphal <fw@...len.de>
Subject: Re: [PATCH net-next 6/6] sched: Eliminate use of flow_keys in
 sch_sfq

On Mon, 2015-03-02 at 11:34 -0800, Tom Herbert wrote:

> Spraying would be quite easy by modulating txhash from TCP and using
> either  UDP encapsulation like GUE or IPv6 flow labels. Only problem
> is that this would constantly be changing rxhash at the receiver for
> the connection, although flow labels might 'just work' with IPv6
> Toeplitz in NICs.

When I said 'regular IPv4/tcp traffic' this did not include any added
encapsulation.

Most NIC are not able to properly offload TCP (TSO) with such
encapsulations.



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