From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neal Cardwell Subject: Re: [PATCH net-next v3] tcp: avoid reducing cwnd when ACK+DSACK is received Date: Mon, 12 Jan 2015 11:48:20 -0500 Message-ID: References: <1421055040-8732-1-git-send-email-sebastien.barre@uclouvain.be> <1421075729.4099.0.camel@edumazet-glaptop2.roam.corp.google.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: =?UTF-8?B?U8OpYmFzdGllbiBCYXJyw6k=?= , David Miller , Yuchung Cheng , Netdev , Gregory Detal , Nandita Dukkipati To: Eric Dumazet Return-path: Received: from mail-qa0-f43.google.com ([209.85.216.43]:64553 "EHLO mail-qa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751074AbbALQs3 convert rfc822-to-8bit (ORCPT ); Mon, 12 Jan 2015 11:48:29 -0500 Received: by mail-qa0-f43.google.com with SMTP id v10so11121678qac.2 for ; Mon, 12 Jan 2015 08:48:28 -0800 (PST) In-Reply-To: <1421075729.4099.0.camel@edumazet-glaptop2.roam.corp.google.com> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 2015-01-12 at 10:30 +0100, S=C3=A9bastien Barr=C3=A9 wrote: > With TLP, the peer may reply to a probe with an > ACK+D-SACK, with ack value set to tlp_high_seq. In the current code, > such ACK+DSACK will be missed and only at next, higher ack will the T= LP > episode be considered done. Since the DSACK is not present anymore, > this will cost a cwnd reduction. Acked-by: Neal Cardwell Thanks! neal