Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262243AbVCBJiI (ORCPT ); Wed, 2 Mar 2005 04:38:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262244AbVCBJiI (ORCPT ); Wed, 2 Mar 2005 04:38:08 -0500 Received: from rrcs-24-123-59-149.central.biz.rr.com ([24.123.59.149]:22583 "EHLO galon.ev-en.org") by vger.kernel.org with ESMTP id S262243AbVCBJiD (ORCPT ); Wed, 2 Mar 2005 04:38:03 -0500 Message-ID: <42258974.4080104@ev-en.org> Date: Wed, 02 Mar 2005 09:37:56 +0000 From: Baruch Even User-Agent: Debian Thunderbird 1.0 (X11/20050116) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Paul Dickson Cc: dickson@permanentmail.com, linux-os@analogic.com, linux-kernel@vger.kernel.org Subject: Re: Network speed Linux-2.6.10 References: <20050301175143.04cbbe64.dickson@permanentmail.com> <422510BA.1010305@ev-en.org> <20050301202400.36259d94.paul@permanentmail.com> In-Reply-To: <20050301202400.36259d94.paul@permanentmail.com> X-Enigmail-Version: 0.90.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1399 Lines: 30 Paul Dickson wrote: > On Wed, 02 Mar 2005 01:02:50 +0000, Baruch Even wrote: > >>>Might this be related to the broken BicTCP implementations in the 2.6.6+ >>>kernels? A fix was added around 2.6.11-rc3 or 4. >> >>Unlikely, the problem with BIC would have shown itself only at high >>speeds over long latency links, not over a lan connection. > > I only mentioned the possibility because I saw the same profile given by > the PDF (the link was mentioned in the patch) while downloading gnoppix > via my cable modem. The oscillations of speed varied from 40K to 500+K. > The average ended up around 270K. (I was using wget for the download). If it is indeed BIC than we have a bug where it doesn't shut itself off for low latencies. Since we don't test this case extensively here (we work to improve high-speed and just make sure we don't ruin slower speeds) I can't say it's impossible, try turning BIC off and see if it helps. Due to the scenario that the OP gave it is more likely something to do with auto-detection somewhere along the way or a driver bug. It is also possible that I'm mistaken and it is BIC, never hurts to check. Baruch - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/