netdev - Re: [PATCH net-next v2] tcp: avoid reducing cwnd when ACK+DSACK is received

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Date:	Thu, 8 Jan 2015 16:24:10 +0100
From:	Sébastien Barré <sebastien.barre@...ouvain.be>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>,
	Gregory Detal <gregory.detal@...ouvain.be>,
	Nandita Dukkipati <nanditad@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next v2] tcp: avoid reducing cwnd when ACK+DSACK is
 received

Hi Eric,

Le 08/01/2015 16:07, Eric Dumazet a écrit :
>
>>   In the current code,
>> such ACK+DSACK will be missed and only at next, higher ack will the TLP
>> episode be considered done. Since the DSACK is not present anymore,
>> this will cost a cwnd reduction.
>>
>> This patch ensures that this scenario does not cause a cwnd reduction, since
>> receiving an ACK+DSACK indicates that both the initial segment and the probe
>> have been received by the peer.
> Do you have at hand a packetdrill test to demonstrate that the patch
> works ?
Not currently, but that would be very good indeed.
I will prepare one and send it.

regards,

Sébastien.
>
> Thanks !
>
>

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