From owner-freebsd-current@FreeBSD.ORG Tue Feb 20 22:27:24 2007 Return-Path: X-Original-To: current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 17EC916CECC for ; Tue, 20 Feb 2007 22:27:24 +0000 (UTC) (envelope-from andy@siliconlandmark.com) Received: from lexi.siliconlandmark.com (lexi.siliconlandmark.com [209.69.98.4]) by mx1.freebsd.org (Postfix) with ESMTP id D03BA13C4A5 for ; Tue, 20 Feb 2007 22:27:23 +0000 (UTC) (envelope-from andy@siliconlandmark.com) Received: from [10.7.6.254] ([63.76.235.163]) by lexi.siliconlandmark.com (8.13.8/8.13.3) with ESMTP id l1KMR8af017760; Tue, 20 Feb 2007 17:27:12 -0500 (EST) (envelope-from andy@siliconlandmark.com) In-Reply-To: <17883.19584.99616.808623@grasshopper.cs.duke.edu> References: <17850.13146.266196.499166@grasshopper.cs.duke.edu> <2FE2BC67-A829-4BF9-B606-65DE1393E8DE@siliconlandmark.com> <17883.19584.99616.808623@grasshopper.cs.duke.edu> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: Andre Guibert de Bruet Date: Tue, 20 Feb 2007 17:27:02 -0500 To: Andrew Gallatin X-Mailer: Apple Mail (2.752.2) X-Virus-Scanned: ClamAV 0.88.7/2614/Tue Feb 20 13:53:11 2007 on lexi.siliconlandmark.com X-Virus-Status: Clean X-Information: Please contact the ISP for more information X-SL-MailScanner: Not scanned: please contact your Internet E-Mail Service Provider for details X-SL-SpamCheck: not spam, SpamAssassin (not cached, score=-1.966, required 6, autolearn=not spam, AWL 0.63, BAYES_00 -2.60, SPF_PASS -0.00) X-MailScanner-From: andy@siliconlandmark.com Cc: current@freebsd.org Subject: Re: excessive TCP duplicate acks? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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: Tue, 20 Feb 2007 22:27:24 -0000 On Feb 20, 2007, at 2:31 PM, Andrew Gallatin wrote: > Thanks for reporting this. I'm glad I'm not the only one who is > seeing this! I discovered this while testing out a new multi-homed bonded-T1 installation. I was wondering why I was getting no more than ~170KB/ s. So far, here are the data points that I have gathered: - It affects more than one type of NIC (em0). - It happens regardless of hardware checksum enabled status. - It happens independent of IP aliasing. - I tested GENERIC as of Feb 19 and it is affected. - A kernel from December 15th, 2006 exhibits this problem. - The affected system is connected to a Linksys 24-port unmanaged gigabit switch (I have the exact same hardware working just fine with 5.5-STABLE on the same switch). dmesg for -CURRENT system: http://bling.properkernel.com/freebsd/ dmesg.boot.txt Cheers, Andy /* Andre Guibert de Bruet * 6f43 6564 7020 656f 2e74 4220 7469 6a20 */ /* Code poet / Sysadmin * 636f 656b 2e79 5320 7379 6461 696d 2e6e */ /* GSM: +1 734 846 8758 * 5520 494e 2058 6c73 7565 6874 002e 0000 */ /* WWW: siliconlandmark.com * C/C++, Java, Perl, PHP, SQL, XHTML, XML */