Re: How does SACK or FACK determine the time to start fastretransmition?

From: Eric Dumazet
Date: Thu Jun 21 2012 - 01:59:02 EST


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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