From owner-freebsd-questions@FreeBSD.ORG Thu Sep 16 18:12:19 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6136C16A4CE for ; Thu, 16 Sep 2004 18:12:19 +0000 (GMT) Received: from watcher.puryear-it.com (ip-66-186-248-99.static.eatel.net [66.186.248.99]) by mx1.FreeBSD.org (Postfix) with ESMTP id 18B5043D2F for ; Thu, 16 Sep 2004 18:12:19 +0000 (GMT) (envelope-from dap99@i-55.com) Received: from localhost (unknown [127.0.0.1]) by watcher.puryear-it.com (Postfix) with ESMTP id 01F9934D3B for ; Thu, 16 Sep 2004 13:11:05 -0500 (CDT) Received: from watcher.puryear-it.com ([127.0.0.1]) by localhost (watcher.puryear-it.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 42350-10 for ; Thu, 16 Sep 2004 13:11:03 -0500 (CDT) Received: from THEBOX (localhost [127.0.0.1]) by watcher.puryear-it.com (Postfix) with SMTP id F117F34D39 for ; Thu, 16 Sep 2004 13:11:02 -0500 (CDT) Message-ID: <060501c49c18$ad4c3f60$6401a8c0@THEBOX> From: "adp" To: Date: Thu, 16 Sep 2004 13:09:22 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Virus-Scanned: by amavisd-new Subject: SMP on SMP-capable system with one processor X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Sep 2004 18:12:19 -0000 We have several Dell-based systems that are dual-processor capable, but have only one processor. The FreeBSD 4.9 kernels for each system is compiled with SMP support, even though there is only one processor on each system right now. Would this actually reduce performance on a single processor system? I know that SMP kernels have to worry about special locking, and may be doing unnecessary work.