From mboxrd@z Thu Jan 1 00:00:00 1970 From: jamal Subject: Re: [PATCH] NET: Multiqueue network device support. Date: Wed, 13 Jun 2007 08:32:15 -0400 Message-ID: <1181737935.4050.87.camel@localhost> References: <466DEF9D.9070509@trash.net> <1181615384.4071.121.camel@localhost> <466E9DF2.9010505@trash.net> <20070612.140240.00078635.davem@davemloft.net> <466F0D74.5030308@trash.net> <1181714168.4758.57.camel@debian.sh.intel.com> Reply-To: hadi@cyberus.ca Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Patrick McHardy , David Miller , peter.p.waskiewicz.jr@intel.com, netdev@vger.kernel.org, jeff@garzik.org, auke-jan.h.kok@intel.com To: Zhu Yi Return-path: Received: from wx-out-0506.google.com ([66.249.82.229]:24603 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756266AbXFMMcT (ORCPT ); Wed, 13 Jun 2007 08:32:19 -0400 Received: by wx-out-0506.google.com with SMTP id t15so168534wxc for ; Wed, 13 Jun 2007 05:32:18 -0700 (PDT) In-Reply-To: <1181714168.4758.57.camel@debian.sh.intel.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Wed, 2007-13-06 at 13:56 +0800, Zhu Yi wrote: > The key argument for Jamal's solution is the NIC will send out 32 > packets in the full PHL in a reasonably short time (a few microsecs per > Jamal's calculation). But for wireless, the PHL hardware has low > probability to seize the wireless medium when there are full of high > priority frames in the air. That is, the chance for transmission in PHL > and PHH is not equal. Queuing packets in software will starve high > priority packets than putting them to PHH as early as possible. > The key arguement i make (from day one actually) is to leave the majority of the work to the driver. My view of wireless WMM etc is it is a different media behavior (compared to wired ethernet) which means a different view of strategy for when it opens the valve to allow in more packets. 802.11 media has embedded signalling which is usable. Guy Cohen gave a good use case which i responded to. Do you wanna look at that and respond? cheers, jamal