From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bifrost.lang.hm (lang.hm [66.167.227.134]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.bufferbloat.net (Postfix) with ESMTPS id 9A3BE3B25D for ; Sun, 3 Jul 2016 03:06:07 -0400 (EDT) Received: from asgard.lang.hm (asgard.lang.hm [10.0.0.100]) by bifrost.lang.hm (8.13.4/8.13.4/Debian-3) with ESMTP id u63762Hj015697; Sun, 3 Jul 2016 00:06:02 -0700 Date: Sun, 3 Jul 2016 00:06:02 -0700 (PDT) From: David Lang X-X-Sender: dlang@asgard.lang.hm To: Luca Muscariello cc: =?ISO-8859-15?Q?Toke_H=F8iland-J=F8rgensen?= , "make-wifi-fast@lists.bufferbloat.net" In-Reply-To: Message-ID: References: <87ziq2o07z.fsf@toke.dk> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: MULTIPART/Mixed; BOUNDARY="===============2375205550764660038==" Subject: Re: [Make-wifi-fast] On the 802.11 performance anomaly and an airtime fairness scheduler to fix it X-BeenThere: make-wifi-fast@lists.bufferbloat.net X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Jul 2016 07:06:07 -0000 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --===============2375205550764660038== Content-Type: TEXT/Plain; format=flowed; charset=US-ASCII On Sun, 3 Jul 2016, Luca Muscariello wrote: > Toke, > > great piece of work. > UDP tests show that the scheduler is working quite well. > TCP tests: no news that ACK streams are a problem. > This is another well known issue in wifi. > > Every data packet is ACKed already at L2 and L4 > sends an ACK that is non contention free. > > There is an NSDI paper in 2014 that proposes to use the L2 ACK to carry the > L4 ACK. > It works well but purists might hate that approach. do they delay the L2 Ack until the L4 ack comes back? If so, how does that work on long-latency connections where it takes a long time for the L4 ack to show up? David Lang --===============2375205550764660038== Content-Type: TEXT/PLAIN; CHARSET=utf-8 Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: INLINE X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KTWFrZS13aWZp LWZhc3QgbWFpbGluZyBsaXN0Ck1ha2Utd2lmaS1mYXN0QGxpc3RzLmJ1ZmZlcmJsb2F0Lm5ldApo dHRwczovL2xpc3RzLmJ1ZmZlcmJsb2F0Lm5ldC9saXN0aW5mby9tYWtlLXdpZmktZmFzdAo= --===============2375205550764660038==--