From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-x233.google.com (mail-qt0-x233.google.com [IPv6:2607:f8b0:400d:c0d::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 418283B29E for ; Thu, 23 Nov 2017 04:45:00 -0500 (EST) Received: by mail-qt0-x233.google.com with SMTP id q13so15750115qtb.5 for ; Thu, 23 Nov 2017 01:45:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=0iMuoo1By4mJj2RUkwQO+aIIJAsWxKTVTvA2FT5oX1k=; b=ZJSuTJts3z1V13+BrDiW592RInjmSy8R9CWPttYI//JBM8Ofw+kPbhniEwjNVulv7t 01Y+JjomNEmQAif/vwfioMmqAjv3nrFTqHI8tWXQHPt683ddFZ2ris7wjuYA0aRZBX9Z nv5UDetRzWSQXlLrghG7x2hv4XwuJ5MJwQ7j9V/s1uWOpJfOyZhqAXeuQPdKarhtkgGM J8ITJj20P64v8n2+r7RBXt8pfumTLvv+MgCfnuix0UsNYi4UKLEXYdpBJLSvUj2A6tej WmZ1jckg1w+Q8+KE8H7qXWhTjEoMgeFb/TpnVLWI6UG2NBrLXehkjt9sGy+jOZBXj0ux aTDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=0iMuoo1By4mJj2RUkwQO+aIIJAsWxKTVTvA2FT5oX1k=; b=AY8aOok6yFXYpOqpdsumtaFka1y+ko974OOWrrrQrtMegXjLwiwMuLxPBEbQOZDZWE evC0zbqTYgd+Ne1tU4DdmQCDknL8uuzcTgfMcdpmfgUY9qtE9X1wu1CayS8wHp7ymmrW p59kbjnarEM7o/ywzElZEPAvdBfyXc4ndn9g61KfQWvWrtdH3Dj49pJdOzK5RezZG05J pbGjtm2aHgnqZ12IBujnBucCrOPzZAkZUWWW+CBBmUd1zs/iE7gXGA7GBriyUEHz368/ 8RSBQMTJYnLpqHnSDrtK12N4IsN8ieLQkqKdMVN74z4QD08CPeDhN8zavMZVE1rdSVEU X7aA== X-Gm-Message-State: AJaThX45doNsznReV4yM+h414jnIJubwxnSBk7Pn4Lin+dX+mczL9WtH CT9D41de8LfadfxxNRQu25LXx1ghtOYF7P7bvJw= X-Google-Smtp-Source: AGs4zMZiHRPFz2cS0EePONvrfAq2IeOG14m3lPqu7BL1UlZnttzun46YuDII4OtGFX2DzzczWfmeLC5Yn7rgNxlhCO0= X-Received: by 10.200.45.150 with SMTP id p22mr36039082qta.130.1511430299772; Thu, 23 Nov 2017 01:44:59 -0800 (PST) MIME-Version: 1.0 Received: by 10.140.84.85 with HTTP; Thu, 23 Nov 2017 01:44:59 -0800 (PST) Received: by 10.140.84.85 with HTTP; Thu, 23 Nov 2017 01:44:59 -0800 (PST) In-Reply-To: <71FB183D-F848-4513-A6F6-D03FD0F10769@gmail.com> References: <71FB183D-F848-4513-A6F6-D03FD0F10769@gmail.com> From: Jonathan Morton Date: Thu, 23 Nov 2017 11:44:59 +0200 Message-ID: To: Pete Heist Cc: Cake List Content-Type: multipart/alternative; boundary="001a1144b8cc1eed1c055ea34a52" Subject: Re: [Cake] lan keyword affects host fairness X-BeenThere: cake@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: Cake - FQ_codel the next generation List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 23 Nov 2017 09:45:00 -0000 --001a1144b8cc1eed1c055ea34a52 Content-Type: text/plain; charset="UTF-8" This is most likely an interaction of the AQM with Linux' scheduling latency. At the 'lan' setting, the time comstants are similar in magnitude to the delays induced by Linux itself, so congestion might be signalled prematurely. The flows will then become sparse and total throughput reduced, leaving little or no back-pressure for the fairness logic to work against. For this reason, you might have better luck with the next higher RTT setting. - Jonathan Morton --001a1144b8cc1eed1c055ea34a52 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

This is most likely an interaction of the AQM with Linux'= ; scheduling latency.

At the 'lan' setting, the time comstants are similar= in magnitude to the delays induced by Linux itself, so congestion might be= signalled prematurely.=C2=A0 The flows will then become sparse and total t= hroughput reduced, leaving little or no back-pressure for the fairness logi= c to work against.

For this reason, you might have better luck with the next hi= gher RTT setting.

- Jonathan Morton

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