netdev - a F-RTO question

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Message-ID: <4F7281ED.1060603@gmail.com>
Date:	Wed, 28 Mar 2012 11:13:49 +0800
From:	Li Yu <raise.sail@...il.com>
To:	netdev@...r.kernel.org
Subject: a F-RTO question

Hi,

	I have a question about tcp_process_frto(), the below source
code :

static int tcp_process_frto(struct sock *sk, int flag)
{
	.....

        if (!before(tp->snd_una, tp->frto_highmark)) {
                tcp_enter_frto_loss(sk, ...);
                return 1;
        }

	.....

}

	As my understanding, the tp->frto_highmark likes tp->high_seq,
it saves the seqno SND_NXT when a TCP connection enters F-RTO phase,
is it the variable "recovery" in NewReno? So I think that if snd_una is
equal with or after frto_highmark, which means peer ack new data, so
why we enter Loss state here?

	Thanks!

Yu


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