Return-path: Received: from el-out-1112.google.com ([209.85.162.177]:43655 "EHLO el-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751000AbYBTSng (ORCPT ); Wed, 20 Feb 2008 13:43:36 -0500 Received: by el-out-1112.google.com with SMTP id v27so1316094ele.23 for ; Wed, 20 Feb 2008 10:43:34 -0800 (PST) Message-ID: <1ba2fa240802201043v1bd4fbddsc55c2230eb2a1480@mail.gmail.com> (sfid-20080220_184340_350404_30012B97) Date: Wed, 20 Feb 2008 20:43:33 +0200 From: "Tomas Winkler" To: "Johannes Berg" Subject: Re: implementing APSD? Cc: linux-wireless , "Ron Rindjunsky" , "Nick Kossifidis" , "Michael Renzmann" , "Luis R. Rodriguez" , "bruno randolf" In-Reply-To: <1203521087.17534.74.camel@johannes.berg> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 References: <1203521087.17534.74.camel@johannes.berg> Sender: linux-wireless-owner@vger.kernel.org List-ID: On Feb 20, 2008 5:24 PM, Johannes Berg wrote: > Hi, > > I've long thought about implementing APSD but it seems to require > setting the "more data" bit in an ACK frame and various other things. > Ron, I think you're the QoS expert, is that really how APSD works? If > so, does iwl firmware implement that? We have uAPSD implementation, mainly AP part, yet again it for older mac. It will take a bit time to merge it in It's a mandatory feature for HT AP. > Also, does Atheros hardware implement that, and how? It doesn't look > like Broadcom firmware implements it, and I don't really understand how > one could implement it without many hardware queues, since it seems > timing critical to send out the frames to the station that is using > APSD. > Don't believe it's possible to that without HW support. Tomas > Any clues? > > johannes >