From owner-freebsd-net@FreeBSD.ORG Sun Oct 26 18:11:52 2014 Return-Path: Delivered-To: freebsd-net@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E85681A5 for ; Sun, 26 Oct 2014 18:11:52 +0000 (UTC) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id CEE8E638 for ; Sun, 26 Oct 2014 18:11:52 +0000 (UTC) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id s9QIBqYB022859 for ; Sun, 26 Oct 2014 18:11:52 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-net@FreeBSD.org Subject: [Bug 194453] [dummynet] pipe config bw parameter is limited to 2Gbits per second Date: Sun, 26 Oct 2014 18:11:53 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 10.0-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: boba@boba.name X-Bugzilla-Status: In Discussion X-Bugzilla-Priority: Normal X-Bugzilla-Assigned-To: freebsd-net@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 26 Oct 2014 18:11:53 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194453 --- Comment #8 from boba@boba.name --- > By that i mean the following: > First of all change the internals of dummynet to opportunistically > check the timer whenever there is traffic, rather than relying on > a one-tick granularity. When dummynet was first implemented the timer > was the 8254, reading it took forever, and 250-1000us granularity was > adequate for the <10Mbit/s range it was meant to emulate. > > Second, the default parameters (1ms, 50 slots queue) limit the capacity of > a pipe to some 600 Mbit/s with 1500-byte packets. Probably the code should > print warnings if queue_capacity/tick is too far from the desired rate. > > Third, the bandwidth value is internally multiplied by other factor > in the execution of the scheduling algorithms. If you bump the data type > from 31 to 32 or 64 bits, you also need to check that the other computations > do not overflow. > > In any case if you decide to go through this route please pass the code > by me for review before committing. -- luigi As I understood, this new framework in FreeBSD now can handle 10GB of traffic (http://info.iet.unipi.it/~luigi/netmap/) and supports pipes and dummynet. Is it production-stable ? Is there some sort of "how-to" on how to use it ? boba. -- You are receiving this mail because: You are the assignee for the bug.