Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266304AbUIAMiX (ORCPT ); Wed, 1 Sep 2004 08:38:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266357AbUIAMe0 (ORCPT ); Wed, 1 Sep 2004 08:34:26 -0400 Received: from gwout.thalesgroup.com ([195.101.39.227]:2574 "EHLO GWOUT.thalesgroup.com") by vger.kernel.org with ESMTP id S266214AbUIAMbp (ORCPT ); Wed, 1 Sep 2004 08:31:45 -0400 Message-ID: <4135C12B.6050208@fr.thalesgroup.com> Date: Wed, 01 Sep 2004 14:31:39 +0200 From: "P.O. Gaillard" Reply-To: pierre-olivier.gaillard@fr.thalesgroup.com Organization: Thales Air Defence User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.1) Gecko/20020827 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ingo Molnar CC: linux-kernel Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-Q5 - netdev_max_back_log is too small References: <20040830192131.GA12249@elte.hu> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1010 Lines: 24 Hello, I know that you have reduced netdev_max_back_log to 8 to reduce the latency. But I think that you should know that I had to set it back to 32 to avoid ethernet frame losses on a 3GHz P4 using e1000 (eth0/threaded=1). My app is still the one with a 20Mbytes/s flow of data and some signal processing work. That's only 20% of max Gigabit Ethernet load and 40% of CPU time. Not really hot stuff. So, this were my 2 cents to help you decide how to balance latency and throughput. I hope that you can find a good balance or find a way to allow people to easily choose their own balance (e.g. maybe there should be a list of parameters impacting latency in the Documentation directory). please keep on the good work and thanks a lot ! P.O. Gaillard - 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/