From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from potemkin.univ-paris7.fr (potemkin.univ-paris7.fr [IPv6:2001:660:3301:8000::1:1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 19AF221F0AE for ; Mon, 1 Jul 2013 16:58:44 -0700 (PDT) Received: from mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [81.194.30.253]) by potemkin.univ-paris7.fr (8.14.4/8.14.4/relay2/38117) with ESMTP id r61Nwg1j017493; Tue, 2 Jul 2013 01:58:42 +0200 Received: from mailhub.math.univ-paris-diderot.fr (localhost [127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTP id 040D74F44B; Tue, 2 Jul 2013 01:58:42 +0200 (CEST) X-Virus-Scanned: amavisd-new at math.univ-paris-diderot.fr Received: from mailhub.math.univ-paris-diderot.fr ([127.0.0.1]) by mailhub.math.univ-paris-diderot.fr (mailhub.math.univ-paris-diderot.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id 1sTlty1eizl8; Tue, 2 Jul 2013 01:58:40 +0200 (CEST) Received: from pirx.pps.jussieu.fr (bob75-6-82-238-73-9.fbx.proxad.net [82.238.73.9]) (Authenticated sender: jch) by mailhub.math.univ-paris-diderot.fr (Postfix) with ESMTPSA id D75A54F441; Tue, 2 Jul 2013 01:58:40 +0200 (CEST) Received: from localhost ([127.0.0.1] helo=pirx.pps.jussieu.fr) by pirx.pps.jussieu.fr with esmtp (Exim 4.80) (envelope-from ) id 1UtnzU-00016G-Ei; Tue, 02 Jul 2013 01:58:40 +0200 Date: Tue, 02 Jul 2013 01:58:40 +0200 Message-ID: <8738rxessv.wl%jch@pps.univ-paris-diderot.fr> From: Juliusz Chroboczek To: bloat@lists.bufferbloat.net References: <20130701164607.GB12090@ens-lyon.fr> User-Agent: Wanderlust/2.15.9 MIME-Version: 1.0 (generated by SEMI 1.14.7 - "Harue") Content-Type: message/rfc822 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (potemkin.univ-paris7.fr [194.254.61.141]); Tue, 02 Jul 2013 01:58:42 +0200 (CEST) X-Mailman-Approved-At: Mon, 01 Jul 2013 17:01:57 -0700 Cc: Baptiste Jonglez Subject: [Bloat] Fwd: [Babel-users] RTT stability inside a GRE tunnel X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Jul 2013 23:58:45 -0000 Delivered-To: X-Virus-Scanned: amavisd-new at math.univ-paris-diderot.fr X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-10000 required=5 tests=[BAYES_00=-1.9] autolearn=ham X-Virus-Scanned: by amavisd-new-2.6.4 (20090625) (Debian) at ens-lyon.fr Date: Mon, 1 Jul 2013 18:46:07 +0200 From: Baptiste Jonglez To: babel-users@lists.alioth.debian.org Message-ID: <20130701164607.GB12090@ens-lyon.fr> MIME-Version: 1.0 User-Agent: Mutt/1.5.21 (2010-09-15) X-policyd-weight: using cached result; rate: -7.6 Subject: [Babel-users] RTT stability inside a GRE tunnel X-BeenThere: babel-users@lists.alioth.debian.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Discussion related to the Babel Routing Daemon List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============8598173661955736441==" Errors-To: babel-users-bounces+jch=pps.univ-paris-diderot.fr@lists.alioth.debian.org Sender: "Babel-users" X-SA-Exim-Connect-IP: ::1 X-SA-Exim-Mail-From: babel-users-bounces+jch=pps.univ-paris-diderot.fr@lists.alioth.debian.org X-SA-Exim-Scanned: No (on wagner.debian.org); SAEximRunCond expanded to false X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.7 (potemkin.univ-paris7.fr [194.254.61.141]); Mon, 01 Jul 2013 18:46:37 +0200 (CEST) --===============8598173661955736441== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="4zI0WCX1RcnW9Hbu" Content-Disposition: inline --4zI0WCX1RcnW9Hbu Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi, While experimenting with the RTT-aware branch of babeld, I ran into an odd but interesting behaviour: between two given hosts reachable over the Internet, the RTT is more stable inside a GRE tunnel than outside. I've measured the RTT between the two hosts (with a simple continuous ping), both inside and outside the GRE tunnel. The result is quite odd: the RTT has way more jitter inside the tunnel (and is also somewhat lower) than outside. See an excerpt of the data: http://ze.polyno.me/babel/ping-tunnel-oddity.png I have absolutely no clue as to what could cause this behaviour; any idea? Baptiste --4zI0WCX1RcnW9Hbu Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.20 (GNU/Linux) iQIcBAEBAgAGBQJR0bJPAAoJEAwdk2Chmk9b1owQAJ1yh9ZDbXxX7sYcX+qs/DEz mB4ctjdu7apcefoF/NTsj6UWIBHvI7+4JQXeYb1Q0t/d8bgTAfisFTL+Jc0xnmqh +Egl50pQgTYK8SPFEmEVMXJRMy37iJ0I8zRvgWnjivTMby7dPkyLmYf5qUDht4RR BYby7CO9NmYgFb48CxNm/2iZD4uOGaeVH6wFQLOoLhBQAuHCZmSLBp30m3RfRXuD dqnqM3X6HJiizbN1XGeUAKkWBzVuHkIeqFcgbln38KBTov+8dHaYIPVGYWo1421z TFiG7AmNGzEtSTdSuGKpr+UXEyg1kF0ilHb0VQ5N0pBPGKc6DWeHR2jRhA7qaSIn Qk2uzL5GdAQAQNVZ/C3Wyy2ATgUZdta/9O6g4oVLikLY3uHAWNP3HkqPv9J7JVEu bnT1qA3fM8RyqeiIGuiqbNbYi5KQJT7+Q1LR36aJoc1OIk5uJtskOrVgvY+MYClm Lahe3jO7Q30trCfzLrHOZ5vWGT4Hx2dcEKKY4PDtf9k61tV8Bl2pa6nxN0xM+KuB Zhp3NuOUdhzEmfwUYF6xWxYjKDI4P449MED4oV9xsA8oyPkfpq3QTZ0xdToUDn2Y o4AHzMAkupxBTYVtrHpq/wSXvKRtz2TJPPOWDaRVxHidMc7uzDQL7+Bz8q4CbfTa gAC06wKaO604MJ0GXJ/0 =ODek -----END PGP SIGNATURE----- --4zI0WCX1RcnW9Hbu-- --===============8598173661955736441== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Babel-users mailing list Babel-users@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/babel-users --===============8598173661955736441==--