linux-kernel - Re: How does SACK or FACK determine the time to start fast retransmition?

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Message-ID: <1340258342.4604.3983.camel@edumazet-glaptop>
Date:	Thu, 21 Jun 2012 07:59:02 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	LovelyLich <lovelylich@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: How does SACK or FACK determine the time to start fast
 retransmition?

On Wed, 2012-06-20 at 22:31 +0800, LovelyLich wrote:
> HI all,
>     When tcp uses reno as its congestion control algothim, it uses
> tp->sacked_out as dup-ack. When the third dup-ack(under default
> condition) comes, tcp will initiate its fast retransmition.
>     But how about sack ?

Some tcp experts out there only catch tcp related stuff if Subject
includes TCP.

You might resend your mail on netdev (not sure lkml will really help)
with following subject :

[RFC] tcp: How does SACK or FACK determine the time to start fast
retransmission?

To get more traction.

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