From owner-freebsd-questions Thu Jun 6 4:37:14 2002 Delivered-To: freebsd-questions@freebsd.org Received: from dns.perimeter.co.za (dns.perimeter.co.za [196.25.164.254]) by hub.freebsd.org (Postfix) with ESMTP id 413B337B403 for ; Thu, 6 Jun 2002 04:37:04 -0700 (PDT) Received: from PATRICK (loopback.mipjhb [209.212.102.245] (may be forged)) by dns.perimeter.co.za (8.11.1/8.11.1) with SMTP id g56Bau171115 for ; Thu, 6 Jun 2002 13:36:58 +0200 (SAST) (envelope-from bsd@perimeter.co.za) Message-ID: <000501c20d4e$250f11f0$b50d030a@PATRICK> From: "Patrick O'Reilly" To: "FreeBSD Question List" Subject: Voice QOS issue using ipfw/dummynet Date: Thu, 6 Jun 2002 13:34:34 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4522.1200 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4522.1200 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Hi all. I am trying to run some voice over an IP link using some devices which convert voice to IP and back again. The IP stream is then passing over a 64k data line which has a FreeBSD gateway at each end. Everything is fine when the first 2 voice channels are open, but once the 3rd, then 4th channels are open the Quality starts to degrade. The voice supposedly only requires about 8k per channel, so even with 4 channels open the line should only be running at about 50% of capacity. I have built the kernels with HZ=1000 just in case the clock granularity was a problem, but that did not help at all. Anyway, at present the ipfw rules are passing the voice traffic without even using a dummynet pipe, so the HZ setting might be inconsequential. Does anyone have any experience with a similar combination of requirements, and have some advice for me? The gateways are running FreeBSD 4.5-RELEASE. They are not doing any other work, and the data line was not in use for any other data during testing of the voice issues. I am not sure what other technical info might be relevant to this issue, so please ask and I'll fill in as required. Regards, Patrick O'Reilly. ___ _ __ / _ )__ __ (_)_ __ ___ _/ /____ __ / __/ -_) _) / ~ ) -_), ,-/ -_) _) /_/ \__/_//_/_/~/_/\__/ \__/\__/_/ http://www.perimeter.co.za To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message