From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.mediaspot.net (dns.mediaspot.net [109.73.92.178]) by huchra.bufferbloat.net (Postfix) with ESMTP id 106D921F1C7 for ; Mon, 25 Nov 2013 10:30:51 -0800 (PST) X-Spam-Status: No, hits=4.0 required=6.5 tests=BAYES_99: 4.07,TOTAL_SCORE: 4.070,autolearn=no X-Spam-Level: **** X-Footer: bWVkaWFzcG90Lm5ldA== Received: from localhost ([127.0.0.1]) by mail.mediaspot.net (using TLSv1/SSLv3 with cipher AES128-SHA (128 bits)) for codel@lists.bufferbloat.net; Mon, 25 Nov 2013 19:30:45 +0100 Received: from EXCHANGE.mediaspot.local ([fe80::ad1d:e7ba:c2f2:37f1]) by EXCHANGE.mediaspot.local ([fe80::ad1d:e7ba:c2f2:37f1%16]) with mapi id 14.03.0123.003; Mon, 25 Nov 2013 19:30:45 +0100 From: Alessandro Bolletta To: "codel@lists.bufferbloat.net" Thread-Topic: [Codel] R: Jumbo frames with fq_codel Thread-Index: AQHO6gvmuE8HrU311UqvNsoiBTks4po2RFbA Date: Mon, 25 Nov 2013 18:30:44 +0000 Message-ID: References: In-Reply-To: Accept-Language: it-IT, en-US Content-Language: it-IT X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.65] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: [Codel] R: R: Jumbo frames with fq_codel 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: Mon, 25 Nov 2013 18:30:53 -0000 No, we are running on batman-adv and it runs on layer-2 and encapsulates la= yer-2 ethernet frames. This encapsulation costs a bit in terms of throughput but it's a big deal o= n mesh networks ;) -- Alessandro Bolletta Mediaspot S.r.l. -----Messaggio originale----- Da: Dave Taht [mailto:dave.taht@gmail.com]=20 Inviato: luned=EC 25 novembre 2013 19.27 A: Alessandro Bolletta Cc: codel@lists.bufferbloat.net Oggetto: Re: [Codel] R: Jumbo frames with fq_codel On Mon, Nov 25, 2013 at 10:17 AM, Alessandro Bolletta wrote: >>On Mon, Nov 25, 2013 at 10:02 AM, Alessandro Bolletta wrote: >> Hi guys, >> I'm working on an environment which runs on jumbo ethernet frames (about= 1550bytes) and I would ask you if do you think that it's needed >a trick i= n order to correctly debloat interfaces as ath9k and ag71xx which carries s= uch big frames. > >>I am under the impression that the ag71xx does not support jumbo frames. >>Slightly larger than usual frames? dunno. > > We are thinking to implement jumbo frames support on some devices=20 > based on ag71xx :) Many SoCs support up to 2028 bytes or 4076 bytes of MT= U but the driver still can't manage MTUs higher than 1518bytes. It sounds like you are going down the path I went down about 7 years back i= n the WISP6 project. Back then I wanted to deliver a pure ipv6 backbone and= encapsulate ipv4 traffic inside it at the normal 1500 MTU. I built hardware that worked with larger MTUs, and encountered more bugs in= ipv6 encapsulation than I care to think about. Then I tried to change hard= ware because the manufacturer had canceled the product and ran into great d= ifficulty finding a replacement. For the record, that device was this one, which supported 2028 bytes or so: http://www.embeddedarm.com/products/board-detail.php?product=3DTS-7250 >>the ath9k supports frames up to the size of the wireless standards=20 >>(23xx bytes or so) > > Yes. > >>fq_codel's internal quantum is the actual ip packet size, not the wire si= ze. >>at lower bandwidths it pays to have a lower quantum (like 300) on outgoin= g interfaces. > >>In openwrt the default on all interfaces is 300, which I dont necessarily= agree with. > > Ok. I thought that codel would leverage on layer-2 parameters, as the siz= e of the ethernet frame. > >> >> Thanks >> >> -- >> Alessandro Bolletta >> Mediaspot S.r.l. >> >> >> _______________________________________________ >> Codel mailing list >> Codel@lists.bufferbloat.net >> https://lists.bufferbloat.net/listinfo/codel > > > > -- > Dave T=E4ht > > Fixing bufferbloat with cerowrt:=20 > http://www.teklibre.com/cerowrt/subscribe.html > > > _______________________________________________ > Codel mailing list > Codel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/codel -- Dave T=E4ht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.= html