Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754701AbXLFXmc (ORCPT ); Thu, 6 Dec 2007 18:42:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751359AbXLFXmX (ORCPT ); Thu, 6 Dec 2007 18:42:23 -0500 Received: from zrtps0kp.nortel.com ([47.140.192.56]:46533 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751155AbXLFXmW (ORCPT ); Thu, 6 Dec 2007 18:42:22 -0500 Message-ID: <475888D5.7010407@nortel.com> Date: Thu, 06 Dec 2007 17:42:13 -0600 From: "Chris Friesen" User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Andi Kleen CC: Renzo Davoli , linux-kernel@vger.kernel.org Subject: Re: New Address Family: Inter Process Networking (IPN) References: <20071205164055.GA2082@cs.unibo.it> <20071206053016.GA1464@cs.unibo.it> <20071206163538.GC20595@one.firstfloor.org> <47585D66.3000404@nortel.com> <20071206212644.GA26725@one.firstfloor.org> <47586E7F.1020903@nortel.com> <20071206220754.GF20595@one.firstfloor.org> <47587F90.8010400@nortel.com> <20071206230611.GK20595@one.firstfloor.org> In-Reply-To: <20071206230611.GK20595@one.firstfloor.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 06 Dec 2007 23:42:16.0562 (UTC) FILETIME=[A2473D20:01C83861] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 901 Lines: 24 Andi Kleen wrote: > On Thu, Dec 06, 2007 at 05:02:40PM -0600, Chris Friesen wrote: >>I just reran on a 3.2GHZ P4 running 2.6.11 (Fedora Core 4). 42% latency >>increase. > Sounds like something that should be looked into. I know of no > principal reasons for that. >>For stream sockets, unix gives approximately a 62% bandwidth increase >>over tcp. (Although tcp could probably be tuned to do better than this.) > How long a stream did you test? You might be measuring slow start. No idea. These are just the standard local networking tests in lmbench v2. In our case the latency was the big concern and we were using datagrams anyway. Chris -- 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/