From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 1 Jun 2001 00:57:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 1 Jun 2001 00:57:24 -0400 Received: from f75.law3.hotmail.com ([209.185.241.75]:25864 "EHLO hotmail.com") by vger.kernel.org with ESMTP id ; Fri, 1 Jun 2001 00:57:21 -0400 X-Originating-IP: [65.25.173.87] From: "John William" To: greearb@candelatech.com Cc: linux-kernel@vger.kernel.org Subject: Re: Abysmal RECV network performance Date: Fri, 01 Jun 2001 04:57:14 Mime-Version: 1.0 Content-Type: text/plain; format=flowed Message-ID: X-OriginalArrivalTime: 01 Jun 2001 04:57:15.0037 (UTC) FILETIME=[5380ACD0:01C0EA57] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org >Depends on what is driving it... An application I built can only push >about >80 Mbps bi-directional on PII 550Mhz machines. It is not the most >efficient program in >the world, but it isn't too bad either... > >I missed the rest of this thread, so maybe you already mentioned it, but >what is the bottleneck? Is your CPU running at 100%? > >Greatly increasing the buffers both in the drivers and in the sockets >does wonders for higher-speed connections, btw. > >Ben I don't know what the bottleneck is. What I'm seeing is ~60Mbps transmit speed and anywhere from 1 to 12Mpbs receive speed on a couple 10/100 cards using the 2.2.16, 2.2.19 and 2.4.3 kernels. I have tried increasing the size of the RX ring buffer and it did not seem to make any difference. It appears that there is some sort of overrun or other problem. There is a significant slowdown between the 2.2.x and 2.4.x kernels. However, just tonight, while really hammering on the system, I started to get some messages like "eth1: Oversized Ethernet frame spanned multiple buffers, status 7fff8301!". Any ideas what could be causing that? - John _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com