From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 89F36200A76 for ; Fri, 10 Aug 2012 11:06:50 -0700 (PDT) Received: by wgbfa7 with SMTP id fa7so1220973wgb.28 for ; Fri, 10 Aug 2012 11:06:48 -0700 (PDT) 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=RmjjDGc+nsDg79o0VWpkEihdbRTqT3go3vfb7vkmyDs=; b=0Nt9/iF6JtLWHmybiY5uaIpFb1Y9OPCx05iwYFH7DyK3WYooVRQWOwJSUL2vEXXEj6 gcVeBKVBuKAjgwY7AuAb+dxitqMI354iLtD7AekZPzjO+aukljKPzPNTFb3CiFRAm+BU bK7n4t3pkQxx5HpP9O+JRZRMrQVc/64R5DrN13DRw1OgFtNYce4jQPNn6xJAa4QueS+4 qf9SU8rfA4U3i04MXwwPrqojwT9IAWohwkvxNccl9t75k13lJ85VjQlyr20qNBgH9j8N LcHHbsu58+Chbf1AOoggaDXwwzj5geajSG38n6Csb5mpU21JqlAOBiQNfB50z9dkL5FQ 7OnA== MIME-Version: 1.0 Received: by 10.180.106.137 with SMTP id gu9mr7780841wib.20.1344622008604; Fri, 10 Aug 2012 11:06:48 -0700 (PDT) Received: by 10.223.167.3 with HTTP; Fri, 10 Aug 2012 11:06:48 -0700 (PDT) In-Reply-To: <1344560847.22354.140661112974666.4C625DA2@webmail.messagingengine.com> References: <1344560847.22354.140661112974666.4C625DA2@webmail.messagingengine.com> Date: Fri, 10 Aug 2012 11:06:48 -0700 Message-ID: From: Dave Taht To: Michael Mee Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] debugging sip udp weirdness in 3.3.[68] X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Aug 2012 18:06:51 -0000 On Thu, Aug 9, 2012 at 6:07 PM, Michael Mee wrote: > [Hoping to help with feedback, but not sure if this is the right place. > Apologies and please redirect me if so!] > > When I run the stock Android Jelly Bean SIP client (part of the dialer) > over my Netgear WNDR3800 on 2.4g (CEROwrt) with 3.3.8 (and also 3.3.6 > prior), the conversations are poor. It sounds like packets are being > dropped all over the place. This is despite plenty of bandwidth > available (ADSL2 at 15 x 1.5Mbps, IPv4). Other (generic, non-CEROwrt) > wireless networks I've tried work well, as does the 4G or 3G service > from my phone. I'm running the GSM codec which consumes about 30kbps. > This is a vanilla SIP connection, using UDP. It doesn't happen all the > time - about 50% (+/- 25%!) of calls. Yes, this is interesting. Are you using QoS on the outgoing link at all? One bug that cropped up in releases prior to 3.3.8-11 was that the VI and B= K portions of the wireless spectrum were being "interestingly" stomped on by the ath9k driver. http://www.bufferbloat.net/issues/402 and 401 As cerowrt is now doing extensive diffserv classification on wifi this could possibly affect voip significantly. (the problem was generic to the ath9k driver however) I'm not ready with a new release of cerowrt yet, however. Also we were using some settings for codel that were suboptimal. In fact it's increasingly likely that no setting on the current fq_codel is optimal in the spot on the wifi driver stack it's at. > If this is interesting to anyone and I can help debug it by providing > more information, I'm happy to. Or, feel free to say "Doh, of course it > doesn't work, this is beta software at best. Go away!" Oh, no, making sure wifi voip works well is very high on our priority list. tcpdump a test stream (I can provide detailed syntax) and we can look at the drop pattern. > > thanks, Michael > _______________________________________________ > Cerowrt-devel mailing list > Cerowrt-devel@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/cerowrt-devel --=20 Dave T=E4ht http://www.bufferbloat.net/projects/cerowrt/wiki - "3.3.8-6 is out with fq_codel!"