From owner-freebsd-current@FreeBSD.ORG Fri Mar 26 07:35:50 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BF33616A4DA for ; Fri, 26 Mar 2004 07:35:50 -0800 (PST) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5226E43D2F for ; Fri, 26 Mar 2004 07:35:50 -0800 (PST) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.10/8.12.10) id i2QFZmg9029032; Fri, 26 Mar 2004 09:35:48 -0600 (CST) (envelope-from dan) Date: Fri, 26 Mar 2004 09:35:48 -0600 From: Dan Nelson To: Kenneth Culver Message-ID: <20040326153548.GD3446@dan.emsphone.com> References: <20040325220939.2ogcsoogkoookwwc@www.sweetdreamsracing.biz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040325220939.2ogcsoogkoookwwc@www.sweetdreamsracing.biz> X-OS: FreeBSD 5.2-CURRENT X-message-flag: Outlook Error User-Agent: Mutt/1.5.6i cc: freebsd-current@freebsd.org Subject: Re: poor gigabit ethernet performance with amd64 + sk0 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Mar 2004 15:35:50 -0000 In the last episode (Mar 25), Kenneth Culver said: > I recently did a short file transfer over gigabit ethernet in both > x86 and amd64. On x86 it appears the limiting factor is the laptop > I'm transferring to. I get about 20MB/sec to the laptop in x86. But > on amd64, I'm not sure what the limiting factor is, because I max out > at about 2.8MB/sec with the EXACT same hardware. Here are the dmesg > lines for that ethernet card: Make sure you're testing ethernet speeds and not disk speeds; try something like ttcp or tcpblast. Even a pII/600mhz can do 50MB/sec; any modern CPU should be able to do 90. You might also want to do a long test, then run systat -v to see if the CPU load or interrupts/sec is different between x86 and amd64 modes. -- Dan Nelson dnelson@allantgroup.com