From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-23-ewr.dyndns.com (mxout-126-ewr.mailhop.org [216.146.33.126]) by lists.bufferbloat.net (Postfix) with ESMTP id E9A062E04C4 for ; Wed, 30 Mar 2011 13:33:01 -0700 (PDT) Received: from scan-21-ewr.mailhop.org (scan-21-ewr.local [10.0.141.243]) by mail-23-ewr.dyndns.com (Postfix) with ESMTP id 3C4C54207A for ; Wed, 30 Mar 2011 20:33:01 +0000 (UTC) X-Spam-Score: -1.0 (-) X-Mail-Handler: MailHop by DynDNS X-Originating-IP: 209.85.214.43 Received: from mail-bw0-f43.google.com (mail-bw0-f43.google.com [209.85.214.43]) by mail-23-ewr.dyndns.com (Postfix) with ESMTP id 5530C41DE7 for ; Wed, 30 Mar 2011 20:32:56 +0000 (UTC) Received: by bwz14 with SMTP id 14so1826917bwz.16 for ; Wed, 30 Mar 2011 13:32:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:subject:mime-version:content-type:from :in-reply-to:date:cc:content-transfer-encoding:message-id:references :to:x-mailer; bh=k/SlKcUJIrfuL5H1Zzmcr1ppXXX3jGDTdlbXEbLvuoc=; b=ZdFxY3R2rtFXJua6Qy48hjKxkhWc1tyLYimoXX32aNeXfFrgQZmavk+QcnWjS3xgwg du6rKiYTHNCVk9sPh3z/Nwp8CNJSstsC19CVHyWAzs0LA/OjPWec+wYAyRp7yOiLl/wy BTYdrMEg7P7JzJUcHA5Sg08vEI6dBtLypvqZw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:mime-version:content-type:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to:x-mailer; b=QleEWlJ8+PsouS/yg7yrTsBOSiWpX4sXwQiuTKc73vVLB+DTfEz6MW0pdRvScEK3fR XF6ir99DQC7RqgNlDls/95how4nceUphEa/+p7Lm1vR4YPPIiGILjGpPLGqKsWSOKL9P cZGz3PAcmH9du+aXLEENHUBf8vasGxZndH1dU= Received: by 10.204.75.1 with SMTP id w1mr1488843bkj.132.1301517175433; Wed, 30 Mar 2011 13:32:55 -0700 (PDT) Received: from [192.168.239.42] (xdsl-83-150-84-172.nebulazone.fi [83.150.84.172]) by mx.google.com with ESMTPS id w3sm306744bkt.5.2011.03.30.13.32.53 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 30 Mar 2011 13:32:54 -0700 (PDT) Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=us-ascii From: Jonathan Morton In-Reply-To: Date: Wed, 30 Mar 2011 23:32:51 +0300 Content-Transfer-Encoding: quoted-printable Message-Id: References: <20110330191156.GC2520@tuxdriver.com> To: Dave Taht X-Mailer: Apple Mail (2.1084) Cc: bloat@lists.bufferbloat.net, "Nathaniel J. Smith" Subject: Re: [Bloat] debloat-testing tree rebased, some patches dropped 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: Wed, 30 Mar 2011 20:33:02 -0000 On 30 Mar, 2011, at 11:06 pm, Dave Taht wrote: > TCP-FIT, anyone? Well, I know enough about it to be able to implement it, but are we = allowed to? I also measured some asymmetry between two of my machines, which led me = to the Sun GEM driver. The GEM is technically a GigE NIC, but in the = machine I'm testing (a PowerBook G3) it has a 100base-TX PHY attached. = Regardless, the GEM driver in Linux sets the ring buffer to 128 entries = for both RX and TX. There is an obvious setting for 32 entries for TX. The other machine has a VIA Rhine NIC, and the driver for that implies = that the ring buffer has 16 entries but deliberately limits it to having = only 10 entries in use. The Responsiveness figures are much higher when = all the traffic comes from the Rhine, compared to when any traffic comes = from the GEM. - Jonathan