From owner-freebsd-smp@FreeBSD.ORG Sun Oct 16 20:59:54 2005 Return-Path: X-Original-To: freebsd-smp@freebsd.org Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7C35F16A41F for ; Sun, 16 Oct 2005 20:59:54 +0000 (GMT) (envelope-from rwatson@FreeBSD.org) Received: from cyrus.watson.org (cyrus.watson.org [209.31.154.42]) by mx1.FreeBSD.org (Postfix) with ESMTP id 354F043D49 for ; Sun, 16 Oct 2005 20:59:54 +0000 (GMT) (envelope-from rwatson@FreeBSD.org) Received: from fledge.watson.org (fledge.watson.org [209.31.154.41]) by cyrus.watson.org (Postfix) with ESMTP id 5B16D46B4B; Sun, 16 Oct 2005 16:59:53 -0400 (EDT) Date: Sun, 16 Oct 2005 21:59:53 +0100 (BST) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: Roger Skjetlein In-Reply-To: <20051008011047.T58661@netrunner.nu> Message-ID: <20051016215759.S66014@fledge.watson.org> References: <20051008011047.T58661@netrunner.nu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-smp@freebsd.org Subject: Re: Poor network performance in 5.4 AMD64 Snap 8 with SMP support X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 16 Oct 2005 20:59:54 -0000 On Sat, 8 Oct 2005, Roger Skjetlein wrote: > I have a server with a Supermikro mainboard and two Xeon 3.0Ghz/2MB. > When running kernel with SMP support the network performance is very > poor, this is very visible on NFS traffic. When running UP kernel the > performance is as espected and very good. > > I have tried some different GB nics and the problems is static and > independent of modell/brand. > > I have also disabled as much as hardware possible, no usb, sio and etc. > > Typical indicator is also that the load on the box is skyrocketing when > it starts to serve nfs client, but the cpu load is very load. > > Is there any way around this problem? Is it possible for you to test using an i386 install rather than an amd64 install, for reference? I use Xeon SMP test hardware in the netperf cluster, and have no problem saturating multiple gigabit ethernet links with either UP or SMP kernels. However, all the Xeons I have access to are 32-bit CPUs. Robert N M Watson