From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-x230.google.com (mail-wg0-x230.google.com [IPv6:2a00:1450:400c:c00::230]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 73FC821F1E6 for ; Mon, 25 Nov 2013 10:26:49 -0800 (PST) Received: by mail-wg0-f48.google.com with SMTP id z12so4246236wgg.15 for ; Mon, 25 Nov 2013 10:26:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=yUKO1eu/WFMM/L6F9BIwL94s9Qxhpl3nQoQ47ImA7PA=; b=zylmHyTL/BMOjyLXCMvenNiQrpBbA4ZcRLNc5roonDeQNPJMpZlx6XZU1iy7P3wKRc QtR+i9ibyuJq4AsPGrXh4KJkw6Ynrpo6K6cbhnJlfai/OvCrewcbPrGMmsXff+Us3zHi VXfPuCPED970Eg449IkN+hopFONSL1GLRq1wotACZTnrjHVLgPC0lozLzHtZpLVhiVZn b59UaHUuz0oZQKuNiSaPfYqdgRWGYS32yjje/wMTvSd2IjnQcKTkdHqRtgfJbjUdrBKQ J9jNvdpsofHhSEKHE48EVyLuTouyzg9/CCXvJYFbEkbsz2z182jr/+jKcFg5iJJk0IGt 5nfw== MIME-Version: 1.0 X-Received: by 10.180.75.115 with SMTP id b19mr14931562wiw.19.1385404007312; Mon, 25 Nov 2013 10:26:47 -0800 (PST) Received: by 10.217.51.5 with HTTP; Mon, 25 Nov 2013 10:26:47 -0800 (PST) In-Reply-To: References: Date: Mon, 25 Nov 2013 10:26:47 -0800 Message-ID: From: Dave Taht To: Alessandro Bolletta Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: "codel@lists.bufferbloat.net" Subject: Re: [Codel] 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 18:26:49 -0000 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 based o= n ag71xx :) > Many SoCs support up to 2028 bytes or 4076 bytes of MTU but the driver st= ill can't manage MTUs higher than 1518bytes. It sounds like you are going down the path I went down about 7 years back in 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 hardware because the manufacturer had canceled the product and ran into great difficulty 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 (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: http://www.teklibre.com/cerowrt/subscrib= e.html > > > _______________________________________________ > Codel mailing list > Codel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/codel --=20 Dave T=E4ht Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.= html