From owner-freebsd-net@FreeBSD.ORG Thu May 5 13:33:03 2005 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0E38616A4CE for ; Thu, 5 May 2005 13:33:03 +0000 (GMT) Received: from us.svf.stuba.sk (us.svf.stuba.sk [147.175.16.9]) by mx1.FreeBSD.org (Postfix) with ESMTP id 62A7443D81 for ; Thu, 5 May 2005 13:33:02 +0000 (GMT) (envelope-from md@us.svf.stuba.sk) Received: from us.svf.stuba.sk (localhost [127.0.0.1]) by us.svf.stuba.sk (8.13.3/8.13.3) with ESMTP id j45DWtxU077252 for ; Thu, 5 May 2005 15:32:59 +0200 (CEST) (envelope-from md@us.svf.stuba.sk) Received: (from md@localhost) by us.svf.stuba.sk (8.13.3/8.13.3/Submit) id j45DWoiD077251 for freebsd-net@freebsd.org; Thu, 5 May 2005 15:32:50 +0200 (CEST) (envelope-from md) Date: Thu, 5 May 2005 15:32:50 +0200 From: Marian Durkovic To: freebsd-net@freebsd.org Message-ID: <20050505133250.GA73885@us.svf.stuba.sk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-Virus-Scanned: ClamAV 0.83/870/Thu May 5 12:54:15 2005 on us.svf.stuba.sk X-Virus-Status: Clean X-Spam-Status: No, score=-2.8 required=5.0 tests=ALL_TRUSTED autolearn=failed version=3.0.2 X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on us.svf.stuba.sk Subject: Degraded TCP performace between 4.9 and 4.11 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 May 2005 13:33:03 -0000 Hi all, recently we've found serious performance degradation for TCP connections between FreeBSD 4.9 and 4.11 at larger packet sizes. We're using two identical machines with Intel PRO/1000 82547EI chipset, which were able to run wirespeed at all packet sizes when 4.9 was installed on both of them. The tests are performed using nttcp -T -n500000 Here are the results: TCP payload 4.9->4.11 4.11->4.9 ---------------------------------------------------- 1448 Bytes 941.0007 Mbps 941.1021 Mbps 2048 957.5791 957.5312 4096 978.1912 978.2145 6144 715.3935 715.7244 8192 631.8491 988.7455 It is obvious, that transfers with TCP payloads upto 4 kB are wirespeed, while larger packets have significantly degraded performance. Any ideas? Thanks & kind regards, -------------------------------------------------------------------------- ---- ---- ---- Marian Durkovic network manager ---- ---- ---- ---- Slovak Technical University Tel: +421 2 524 51 301 ---- ---- Computer Centre, Nam. Slobody 17 Fax: +421 2 524 94 351 ---- ---- 812 43 Bratislava, Slovak Republic E-mail/sip: md@bts.sk ---- ---- ---- --------------------------------------------------------------------------