netdev - Re: [PATCH v4 net-next] net: introduce dev_set

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Message-ID: <1383879113.9412.155.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 07 Nov 2013 18:51:53 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, bhutchings@...arflare.com,
	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: [PATCH v4 net-next] net: introduce dev_set_forwarding()

On Thu, 2013-11-07 at 18:42 -0800, Eric Dumazet wrote:

> A normal TSO packets with 16 MSS setups a ~17 DMA descriptors,
> while GSO requires 2 DMA descriptors per MSS, plus a lot of overhead
> in sk_buff allocation/deallocation.

Not mentioning fact that a 64KB packet is adding latencies, since high
prio packets have to wait the whole preceding 64KB packet has left the
host.


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