netdev - Re: TCP and reordering

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Message-ID: <1354125688.21562.95.camel@shinybook.infradead.org>
Date:	Wed, 28 Nov 2012 18:01:28 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Benjamin LaHaise <bcrl@...ck.org>,
	Vijay Subramanian <subramanian.vijay@...il.com>,
	David Miller <davem@...emloft.net>, saku@...i.fi,
	rick.jones2@...com, netdev@...r.kernel.org
Subject: Re: TCP and reordering

On Wed, 2012-11-28 at 09:16 -0800, Eric Dumazet wrote:
> Its the driver responsibility to maintain the coherent 'bytes' value for
> each transmitted/completed packet.
> 
> If a driver calls an external entity, it cannot possibly use BQL, unless
> doing an approximation (bytes becomes a fixed value)

If tracking the original destructor, I can also track the original size
before the skb got passed down the stack.

> BQL was really something to control/limit queueing on ethernet links,
> not for stacked devices, as stacked devices normally have no queue.

Stacked devices have more queue than anything else :)

-- 
dwmw2


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