From owner-freebsd-questions@FreeBSD.ORG Thu Jun 15 18:57:55 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2219A16A41A for ; Thu, 15 Jun 2006 18:57:55 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from pi.codefab.com (pi.codefab.com [199.103.21.227]) by mx1.FreeBSD.org (Postfix) with ESMTP id B912443D49 for ; Thu, 15 Jun 2006 18:57:54 +0000 (GMT) (envelope-from cswiger@mac.com) Received: from localhost (localhost [127.0.0.1]) by pi.codefab.com (Postfix) with ESMTP id 105535EB2; Thu, 15 Jun 2006 14:57:54 -0400 (EDT) X-Virus-Scanned: amavisd-new at codefab.com Received: from pi.codefab.com ([127.0.0.1]) by localhost (pi.codefab.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aA-oWjpd3bdI; Thu, 15 Jun 2006 14:57:53 -0400 (EDT) Received: from [199.103.21.238] (pan.codefab.com [199.103.21.238]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by pi.codefab.com (Postfix) with ESMTP id 3EC5F5C16; Thu, 15 Jun 2006 14:57:53 -0400 (EDT) In-Reply-To: <20060615182540.43537.qmail@web54009.mail.yahoo.com> References: <20060615182540.43537.qmail@web54009.mail.yahoo.com> Mime-Version: 1.0 (Apple Message framework v750) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <8A5A6474-58E1-43EB-88DF-9C7E69DECF13@mac.com> Content-Transfer-Encoding: 7bit From: Charles Swiger Date: Thu, 15 Jun 2006 14:57:52 -0400 To: Paul Marciano X-Mailer: Apple Mail (2.750) Cc: freebsd-questions@freebsd.org Subject: Re: fxp driver performance expectations X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Jun 2006 18:57:55 -0000 On Jun 15, 2006, at 2:25 PM, Paul Marciano wrote: > For larger packets (e.g. 700 bytes) I am getting > 100Mbps throughput port to port. > > For min-size packets (64 bytes) I am only seeing > around 60Mbps. Increasing HZ and the polling > parameters does not help. You should be aware that the minimum 64-byte packet size does not count the 8-byte ethernet frame preamble (well, 7 bytes of preamble and 1 byte called the "start frame delimiter"), which means that you'll only be able to get a theoretical maximum of about 87 Mbps of packet data through at the 64-byte packet size. -- -Chuck