From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from nbd.name (unknown [IPv6:2a01:4f8:131:30e2::2]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by huchra.bufferbloat.net (Postfix) with ESMTPS id 838B321F194; Fri, 21 Dec 2012 13:59:09 -0800 (PST) Message-ID: <50D4DB23.1010306@openwrt.org> Date: Fri, 21 Dec 2012 22:56:51 +0100 From: John Crispin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.7) Gecko/20120922 Icedove/10.0.7 MIME-Version: 1.0 To: David Woodhouse References: <20121220103213.4ABAD800037@ip-64-139-1-69.sjc.megapath.net> <1356011592.2372508@apps.rackspace.com> <1356112139.35814863@apps.rackspace.com> <1356114301.310221396@apps.rackspace.com> <1356126843.2420.35.camel@shinybook.infradead.org> In-Reply-To: <1356126843.2420.35.camel@shinybook.infradead.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Fri, 21 Dec 2012 14:04:01 -0800 Cc: bloat-devel , David P Reed , "codel@lists.bufferbloat.net" , "cerowrt-devel@lists.bufferbloat.net" Subject: Re: [Codel] [Cerowrt-devel] hardware hacking on fq_codel in FPGA form at 10GigE X-BeenThere: codel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: CoDel AQM discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Dec 2012 21:59:10 -0000 > So the ATM driver would have to go out of its way to screw you over¹. John? the lantiq atm/dsl drivers use a dma ring to push packets from the atm layer to the dsl modem core. this ring needs to be 2 packets big as a minimum to have the hardware work. however, using software we can make sure that only 1 packet at a tim eis inside the ring. this is what my current dirty hack does. > Btw, I'm looking at ways to *make* BQL on the PPP netdev work properly, tracking packets all the way to the wire even when it's PPPoA, PPPoE(oA), L2TP or whatever. yay :)