netdev - Re: delayed ack timer, slow start and LRO

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Message-ID: <20080722221147.GA29276@2ka.mipt.ru>
Date:	Wed, 23 Jul 2008 02:11:47 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	jean-pascal billaud <billaud@...are.com>
Cc:	netdev@...r.kernel.org
Subject: Re: delayed ack timer, slow start and LRO

Hi.

On Tue, Jul 22, 2008 at 02:44:05PM -0700, jean-pascal billaud (billaud@...are.com) wrote:
> Also as LRO adds some latency, it seems possible to me that the sender 
> retransmission timer will expires before the delayed ack timer expires. In 
> this case, how is this gonna work ? Is it possible that the sender will 
> stay stuck in
> its slow start trying to retransmit endlessly the same n packets ?

You can check how your favourite driver handles lro and calls
lro_flush_all(), lro also aggregate packets upto predefined limits of
total size and numbr of 'inner' packets. It also self-destructs when
flow breaks (retransmit, pure ack and so on).

-- 
	Evgeniy Polyakov
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