From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261983AbVG0Ioy (ORCPT ); Wed, 27 Jul 2005 04:44:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262007AbVG0Ioy (ORCPT ); Wed, 27 Jul 2005 04:44:54 -0400 Received: from highlandsun.propagation.net ([66.221.212.168]:56327 "EHLO highlandsun.propagation.net") by vger.kernel.org with ESMTP id S261983AbVG0Iox (ORCPT ); Wed, 27 Jul 2005 04:44:53 -0400 Message-ID: <42E7497B.5040202@highlandsun.com> Date: Wed, 27 Jul 2005 01:44:43 -0700 From: Howard Chu User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b2) Gecko/20050621 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: 2.6.12.3 network slowdown? References: <1122452018.772579.63900@g49g2000cwa.googlegroups.com> <20050727082020.C73AC5F7CA@attila.bofh.it> In-Reply-To: <20050727082020.C73AC5F7CA@attila.bofh.it> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I just recently compiled the 2.6.12.3 kernel for my x86_64 machine (Asus A8V motherboard); was previously running a SuSE-compiled 2.6.8 kernel (SuSE 9.2 distro). I'm now seeing extremely slow throughput on the onboard Yukon (Marvell) ethernet interface, but only in certain conditions. Going back to the 2.6.8 kernel shows no slowdown. I have a few machines connected to a Linksys 5 port 10/100 hub. There is also a Linksys WRT54G wireless router on this hub. When doing a raw ftp transfer of a large (600MB) file (using a Windows XP client to do a GET) with both machines plugged into the hub, I see transfer rates only as high as 1MB/sec initially, which quickly degrades to ~200KB/sec over a span of 20-30 seconds. Going the opposite direction, a PUT runs at a steady 7.5MB/sec. If I unplug the Windows client and just connect via the wireless network, I see GETs run a steady 2.8MB/sec and PUTs run a steady 3.2MB/sec, which is about the same as I saw with the 2.6.8 kernel, so that all appears normal. (But it's still odd, that adding one hop like this avoids the throughput degradation.) I don't see any collisions or any other errors on the ifconfig statistics, just a very slow transmit rate. Does anyone recognize this symptom? Any suggestions on tunables to tweak, etc.? (Please cc: me directly when replying, thanks.) -- -- Howard Chu Chief Architect, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc OpenLDAP Core Team http://www.openldap.org/project/