From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <hrogge@gmail.com>
Received: from mail-lf0-x22a.google.com (mail-lf0-x22a.google.com
 [IPv6:2a00:1450:4010:c07::22a])
 (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 123BC3B496
 for <cake@lists.bufferbloat.net>; Fri, 15 Apr 2016 07:03:15 -0400 (EDT)
Received: by mail-lf0-x22a.google.com with SMTP id g184so141013285lfb.3
 for <cake@lists.bufferbloat.net>; Fri, 15 Apr 2016 04:03:15 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:from:date:message-id:subject:to;
 bh=TMl7pV85SK6YKjkIKUwFLIy87J4EGDYGJgvoEzYqvcI=;
 b=c+vFqE/jc1E9hkFms5D6/w2lgV0WL0ekX3Zc6pjVkyvxslZct6RChlrawJSDGuGqO2
 IemqitQGqNw6UNLt+jlYoYU3kQ0THYKFX62+mVe3AjC6WuaSBMOAa+fPPOBdtgj5wZW3
 57KZSmNLuVCAPQhBPmnbmNH7wmh4UGX8X1bMRKt37iiNDyKShqfZvc84E+UJNIc4JCZ4
 fuV2ldJ+NEfzH/hZJCuzeM9ttti0bYwr/PCWPEfkacFuygCQdtjk7cR+o8MCJ2mPAX65
 AXaEvnZyBbvvFxsl7u+jMZSjqQRz5IZChadnKndN399xe9E3db2soCRLg2XjfUGyRMKC
 rQEQ==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20130820;
 h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
 bh=TMl7pV85SK6YKjkIKUwFLIy87J4EGDYGJgvoEzYqvcI=;
 b=IthYtQJ6R34abNIMNfYCr+PCoznodjThQVSChoLp03dUgKm49Py8zoHVA6qKs5xnCR
 rL3NIMRDORbtxy8A1Xl+GNC1wOLMwbtW2gFZZlbUah60ySuFudCaeGAwPyOhFYydOMg8
 mqBuZgx/iKP04+4/keezmOYAUirf08c3PQliWNMyv138NZ4fwcUQVEvg6vWpr9ooMowj
 offPUg7omzscZ3sEUdjZ8598fJOu66cwOF3xzFw4dKk7ndWOO06mLGMd9+wBr/bjaCUC
 PZE189OLeG0K/b4gSl5/urm9H/quQMngMOBZij67YOM7R70CErjLqaJ1uhKWW5EcCFwn
 t8JQ==
X-Gm-Message-State: AOPr4FWibLKLFNE4Hhd7RarmvuKcK6LI8bRvqqukJiCaX468bw77MALpaubMeKl01d5dhJtjUfdoMCMLPP2Gxw==
X-Received: by 10.112.72.135 with SMTP id d7mr8784959lbv.126.1460718194480;
 Fri, 15 Apr 2016 04:03:14 -0700 (PDT)
MIME-Version: 1.0
Received: by 10.25.21.30 with HTTP; Fri, 15 Apr 2016 04:02:44 -0700 (PDT)
From: Henning Rogge <hrogge@gmail.com>
Date: Fri, 15 Apr 2016 13:02:44 +0200
Message-ID: <CAGnRvur9nL31XUOK4a2aBnk6Ec_t0DGW7m8Cu4_TjOxwO_FJUg@mail.gmail.com>
To: cake@lists.bufferbloat.net
Content-Type: text/plain; charset=UTF-8
Subject: [Cake] Cake in userspace
X-BeenThere: cake@lists.bufferbloat.net
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Cake - FQ_codel the next generation <cake.lists.bufferbloat.net>
List-Unsubscribe: <https://lists.bufferbloat.net/options/cake>,
 <mailto:cake-request@lists.bufferbloat.net?subject=unsubscribe>
List-Archive: <https://lists.bufferbloat.net/pipermail/cake>
List-Post: <mailto:cake@lists.bufferbloat.net>
List-Help: <mailto:cake-request@lists.bufferbloat.net?subject=help>
List-Subscribe: <https://lists.bufferbloat.net/listinfo/cake>,
 <mailto:cake-request@lists.bufferbloat.net?subject=subscribe>
X-List-Received-Date: Fri, 15 Apr 2016 11:03:16 -0000

Hi,

I am working on an interface between an existing physical (wireless)
layer and the Linux IP stack.

The maximum speed of the PHY is quite slow (but has some long
timeslots for data) and we will do lots of experiments, so everything
is in Userspace and uses a TAP device to pretend to be a real device
driver.

Of course I am running into the same issues that the Mac80211 wifi
stack has... queuing and aggregation. To aggregate data I have to
remove IP packets from the the TUN interface, which removes them from
control of IP queuing... and only afterwards I can inspect them if
they CAN be aggregated.

How difficult would it be to implement Cake directly in Userspace
behind a TAP device (that you always drain of all incoming packets)?

This might be an interesting way to experiment with Cake AND might
solve my problem too.

Henning Rogge