From owner-freebsd-net Wed Jul 4 2:33:40 2001 Delivered-To: freebsd-net@freebsd.org Received: from verdi.nethelp.no (verdi.nethelp.no [158.36.41.162]) by hub.freebsd.org (Postfix) with SMTP id EC7F737B403 for ; Wed, 4 Jul 2001 02:33:35 -0700 (PDT) (envelope-from sthaug@nethelp.no) Received: (qmail 71215 invoked by uid 1001); 4 Jul 2001 09:33:33 +0000 (GMT) To: julian@elischer.org Cc: bjf@samurai.com, net@freebsd.org Subject: Re: PPPoE latency From: sthaug@nethelp.no In-Reply-To: Your message of "Tue, 03 Jul 2001 08:56:44 -0700" References: <3B41EB3C.EF185F3F@elischer.org> X-Mailer: Mew version 1.05+ on Emacs 19.34.2 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Date: Wed, 04 Jul 2001 11:33:33 +0200 Message-ID: <71213.994239213@verdi.nethelp.no> Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org > > Here's a ping on my friend's machine (Mac ping, sorry for lack of precision): > > > > Packets out/in/bad/%loss = 64/64/0/0.0 > > Round Trip Time (ms) min/avg/max = 14/24/59 > > > > My box should be fine cpu-wise, it's a Celeron/300, and isn't doing > > anything else. The card PPPoE is running over is an ISA 10BaseT > > D-Link card using the ed(4) driver, if that makes any difference. I > > track STABLE with this box, it's currently at: > > > > FreeBSD katana.apt.samurai.com 4.3-STABLE FreeBSD 4.3-STABLE #13: Sun > > Jun 24 01:43:39 EDT 2001 > > > > Any thoughts? I can live with this, the connection is rock solid and > > has been for over a year now, just curious as to why. Apologies if > > this has come up before, I searched the list archives and the bug > > list. > > you may be a good test case for us.. > we have heard of this negraph latency for a while but have never had a good > test case.. if I send you test code can you run it for me? I believe the latency for the basic netgraph code is a complete non-issue. I have an ADSL connection where I can control both ends (this is for an ISP which is just starting to test ADSL). - With straight bridging (RBE on the Cisco at the ISP end), I get ping roundtrip times of 9.2 ms on the average (ping a host reachable through the router, not the router itself). - With PPPoe (and of course netgraph) I get ping roundtrip times of 9.4 ms on the average. Thus the basic netgraph machinery plus userland ppp adds around 0.2 ms to the roundtrip times. I see no reason to complain about this. Steinar Haug, Nethelp consulting, sthaug@nethelp.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message