From owner-freebsd-stable@FreeBSD.ORG Sun May 18 20:45:13 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 64890106566C for ; Sun, 18 May 2008 20:45:13 +0000 (UTC) (envelope-from daniel@skytek.it) Received: from mail.skytek.it (mail.skytek.it [217.194.176.18]) by mx1.freebsd.org (Postfix) with ESMTP id C7FF58FC0C for ; Sun, 18 May 2008 20:45:12 +0000 (UTC) (envelope-from daniel@skytek.it) Received: from [192.168.30.100] ([192.168.30.100]) by mail.skytek.it (Skytek Mail Server v.11.47-p9) with ASMTP id YZL46811; Sun, 18 May 2008 22:45:11 +0200 Message-ID: <4830956A.80000@skytek.it> Date: Sun, 18 May 2008 22:45:30 +0200 From: Daniel Ponticello User-Agent: Thunderbird 2.0.0.14 (Windows/20080421) MIME-Version: 1.0 To: cliftonr@lava.net References: <48303A1B.9000103@skytek.it> <20080518182827.GA18109@lava.net> In-Reply-To: <20080518182827.GA18109@lava.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org Subject: Re: Disk access/MPT under ESX3.5 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 18 May 2008 20:45:13 -0000 Clifton Royston ha scritto: > > If you are accessing a software emulation of a SCSI disk, I would > offhand expect the CPU load to go up substantially when you are reading > or writing it at the maximum achievable bandwidth. You can't expect > normal relative load results under an emulator, and while most > application or kernel code runs natively, I/O under VMWare will zoom in > and out of the emulator a lot. I'm afraid I can't give you a > definitive answer as I have VMWare but haven't set up FreeBSD under it > yet. > > -- Clifton > Thanks Clifton, my problem is that system (console) becomes very unresponsive when I/O is writing at maximum bandwidth. Anyway, system becomes more responsive when using ULE scheduler instead of 4BSD during I/O. Is there a way to limit the maximum I/O bandwidth used by the controller? Daniel -- WBR, Cordiali Saluti, Daniel Ponticello, VP of Engineering Network Coordination Centre of Skytek --- - For further information about our services: - Please visit our website at http://www.Skytek.it ---