From owner-freebsd-scsi@FreeBSD.ORG Sun Apr 17 22:14:01 2005 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 4403C16A4CE; Sun, 17 Apr 2005 22:14:01 +0000 (GMT) Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57]) by mx1.FreeBSD.org (Postfix) with ESMTP id 81D1543D2D; Sun, 17 Apr 2005 22:13:58 +0000 (GMT) (envelope-from scottl@samsco.org) Received: from [192.168.254.11] (junior-wifi.samsco.home [192.168.254.11]) (authenticated bits=0) by pooker.samsco.org (8.13.1/8.13.1) with ESMTP id j3HMGFBC071103; Sun, 17 Apr 2005 16:16:15 -0600 (MDT) (envelope-from scottl@samsco.org) Message-ID: <4262DED7.80907@samsco.org> Date: Sun, 17 Apr 2005 16:10:31 -0600 From: Scott Long User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.5) Gecko/20050218 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Mikhail Teterin References: <200504172209.j3HM9Wbu097640@corbulon.video-collage.com> In-Reply-To: <200504172209.j3HM9Wbu097640@corbulon.video-collage.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-2.8 required=3.8 tests=ALL_TRUSTED autolearn=failed version=3.0.2 X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on pooker.samsco.org cc: freebsd-scsi@freebsd.org cc: trhodes@freebsd.org cc: Mikhail Teterin cc: msmith@mu.org Subject: Re: speed of a ciss-based pseudo-disk X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 Apr 2005 22:14:01 -0000 Mikhail Teterin wrote: >>>Why is the reported speed only 135.168MB/s? All equipment is U320, >>>so I'd expect the nominal speed of 320MB/s... > > > >>Just because a disk can communicate at Ultra320 doesn't mean that it >>can sustain data at that rate. > > > Yes, and the kernel would have no way of knowing the sustainable speed > anyway. > > Which is all why I was inquiring about the _NOMINAL_ speed reported... > > -mi Are you asking that someone go implement a 'nominal' speed tester in the kernel that will accurately determine the speed of each attached storage device? Would you demand your money back if the number reported was wrong? Why does it matter? Your SCSI busses are running at Ultra320, and that is that. Just because gcc + mozilla isn't reliable in your configurations... oops, wrong argument. Scott