netdev - Re: TCP not triggering a fast retransmit?

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Message-ID: <4C2B9A61.1000208@athenacr.com>
Date:	Wed, 30 Jun 2010 15:26:25 -0400
From:	Brian Bloniarz <bmb@...enacr.com>
To:	Ivan Novick <novickivan@...il.com>
CC:	netdev@...r.kernel.org, jmatthews@...enplum.com,
	Tim Heath <theath@...enplum.com>
Subject: Re: TCP not triggering a fast retransmit?

On 06/30/2010 02:04 PM, Ivan Novick wrote:
> I am wondering why did the sender not send more data?  If the sender
> was to send more data and extend the window then it would seem the
> duplicate acks or SACKS should trigger fast retransmit.

Hi Ivan,

Like you said, the receive window can't explain why the sender wouldn't
send. The congestion window is another possible reason why the sender
might not send, though it's sorta impossible to tell if that's really
it from a small tcpdump. Maybe investigating the details of congestion
control might yield something?

HTH,
-Brian
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