From owner-freebsd-smp@FreeBSD.ORG Wed Nov 12 13:09:18 2003 Return-Path: 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 7D10E16A4CE for ; Wed, 12 Nov 2003 13:09:18 -0800 (PST) Received: from web80103.mail.yahoo.com (web80103.mail.yahoo.com [66.163.169.76]) by mx1.FreeBSD.org (Postfix) with SMTP id 9201443FAF for ; Wed, 12 Nov 2003 13:09:17 -0800 (PST) (envelope-from maffew@sbcglobal.net) Message-ID: <20031112210917.10741.qmail@web80103.mail.yahoo.com> Received: from [148.163.108.2] by web80103.mail.yahoo.com via HTTP; Wed, 12 Nov 2003 13:09:17 PST Date: Wed, 12 Nov 2003 13:09:17 -0800 (PST) From: matthew tillman To: freebsd-smp@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Subject: device pcm kills SMP performance -CURRENT X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Nov 2003 21:09:18 -0000 Hello- I have an ACorp 6A815EPD motherboard, Intel i815 chipset, with a pair of P3 733s. My sound card, is a SoundBlaster Live Value. Whenever sound support is compiled in the Kernel, performance takes a huge hit, X runs about the same as on a P2 300 or so. But If I boot to a kernel that is configured exactly the same, without device pcm, the system is very responsive. Booting to a non-SMP kernel in 5.1-Release with or without sound support, the system was very fast. I did not try no sound support with SMP, as I thought the issue was only SMP performance in general. I then CVSuped to -CURRENT on Nov 8th, because at the time I didn't realise the issue was isolated to the sound system. However, I still have the same issue. I also tried swapping the card into a diffrent PCI slot, but that didn't help. Any ideas? Thanks, Matthew