netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Li Yu <raise.sail@gmail.com>
To: netdev@vger.kernel.org
Subject: a F-RTO question
Date: Wed, 28 Mar 2012 11:13:49 +0800	[thread overview]
Message-ID: <4F7281ED.1060603@gmail.com> (raw)

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

             reply	other threads:[~2012-03-28  3:14 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-28  3:13 Li Yu [this message]
2012-03-28  3:49 ` a F-RTO question Chao Pei
2012-03-28  4:08   ` Li Yu
2012-03-28  5:27     ` Chao Pei
2012-03-28  5:35     ` Yuchung Cheng
2012-03-28  6:43       ` Li Yu
2012-04-10  8:34     ` Ilpo Järvinen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4F7281ED.1060603@gmail.com \
    --to=raise.sail@gmail.com \
    --cc=netdev@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).