From owner-freebsd-questions@FreeBSD.ORG Sun Jul 29 11:29:38 2012 Return-Path: Delivered-To: questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 8B960106564A for ; Sun, 29 Jul 2012 11:29:38 +0000 (UTC) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from wojtek.tensor.gdynia.pl (wojtek.tensor.gdynia.pl [89.206.35.99]) by mx1.freebsd.org (Postfix) with ESMTP id EB89C8FC14 for ; Sun, 29 Jul 2012 11:29:37 +0000 (UTC) Received: from wojtek.tensor.gdynia.pl (localhost [127.0.0.1]) by wojtek.tensor.gdynia.pl (8.14.5/8.14.5) with ESMTP id q6TBTWEa003924; Sun, 29 Jul 2012 13:29:35 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Received: from localhost (wojtek@localhost) by wojtek.tensor.gdynia.pl (8.14.5/8.14.5/Submit) with ESMTP id q6TB5AKw003863; Sun, 29 Jul 2012 13:05:10 +0200 (CEST) (envelope-from wojtek@wojtek.tensor.gdynia.pl) Date: Sun, 29 Jul 2012 13:05:10 +0200 (CEST) From: Wojciech Puchar To: Erich Dollansky In-Reply-To: <20120729064846.3bc37892@AMD620.ovitrap.com> Message-ID: References: <20120729064846.3bc37892@AMD620.ovitrap.com> User-Agent: Alpine 2.00 (BSF 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7 (wojtek.tensor.gdynia.pl [127.0.0.1]); Sun, 29 Jul 2012 13:29:35 +0200 (CEST) Cc: questions@freebsd.org, Vladimir Videscu Subject: Re: FreeBSD on SSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Jul 2012 11:29:38 -0000 > > You will have to read afterwards the same 8GB over and over again to > make the drive believe that you want to have these 8GB faster. and do it randomly. disk is for sure smart enough to not cache long linear reads . > > How to make sure that the data is really cached? > There is no way. true. That's why i don't like such solution. And such drive is very expensive.