netdev - Re: gso: Attempt to handle mega-GRO packets

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Message-ID: <1383750341.4291.166.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 06 Nov 2013 07:05:41 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com, mst@...hat.com
Subject: Re: gso: Attempt to handle mega-GRO packets

On Wed, 2013-11-06 at 16:16 +0800, Herbert Xu wrote:

> Instead of using perfectly sane 4K pages per frag to store guest to
> guest traffic, we now end up using 1.5K frags, which that's why you
> end up having to use the frag_list, WTF?

Sure, if your host has infinite amount of memory, we can remove all the
silly and expensive and bore some checks we added in the stack against
skb->truesize.

And yes, network stack will be faster.

But in real life, we have memory constraints.


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