From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Wedgwood Subject: Re: [PATCH 0/2] NET: Accurate packet scheduling for ATM/ADSL Date: Mon, 19 Jun 2006 22:35:36 -0700 Message-ID: <20060620053536.GA10311@tuatara.stupidest.org> References: <1150278004.26181.35.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev Return-path: Received: from smtp107.sbc.mail.mud.yahoo.com ([68.142.198.206]:28244 "HELO smtp107.sbc.mail.mud.yahoo.com") by vger.kernel.org with SMTP id S932497AbWFTFfj (ORCPT ); Tue, 20 Jun 2006 01:35:39 -0400 To: Jesper Dangaard Brouer Content-Disposition: inline In-Reply-To: <1150278004.26181.35.camel@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Wed, Jun 14, 2006 at 11:40:04AM +0200, Jesper Dangaard Brouer wrote: > The Linux traffic's control engine inaccurately calculates > transmission times for packets sent over ADSL links. For some > packet sizes the error rises to over 50%. This occurs because ADSL > uses ATM as its link layer transport, and ATM transmits packets in > fixed sized 53 byte cells. What if AAL5 is used? The cell-alignment math is going to be wrong there surely?