From owner-freebsd-questions Sun Sep 1 12:29:24 2002 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 EC3CE37B400; Sun, 1 Sep 2002 12:29:21 -0700 (PDT) Received: from russian-caravan.cloud9.net (russian-caravan.cloud9.net [168.100.1.4]) by mx1.FreeBSD.org (Postfix) with ESMTP id E60E743E77; Sun, 1 Sep 2002 12:29:20 -0700 (PDT) (envelope-from Hostmaster@Video2Video.Com) Received: from earl-grey.cloud9.net (earl-grey.cloud9.net [168.100.1.1]) by russian-caravan.cloud9.net (Postfix) with ESMTP id 603E428B36; Sun, 1 Sep 2002 15:29:20 -0400 (EDT) Date: Sun, 1 Sep 2002 15:29:20 -0400 (EDT) From: Peter Leftwich X-X-Sender: To: Greg 'groggy' Lehey Cc: Giorgos Keramidas , FreeBSD LIST Subject: Re: dd if=/dev/zero of=/dev/ad1 In-Reply-To: <20020826013322.GD88156@wantadilla.lemis.com> Message-ID: <20020901152742.M37627-100000@earl-grey.cloud9.net> Organization: Video2Video Services - http://Www.Video2Video.Com MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Mon, 26 Aug 2002, Greg 'groggy' Lehey wrote: > > True. You might want to use a large block size to speed operations if > > possible (less I/O calls from dd(1) to the kernel, and more freedom to > > the kernel drivers to arrange in which order data is zeroed). Try at > > least 32 KB. > The optimum is the maximum transfer size, currently 128 kB. > Greg {See complete headers for address and phone numbers} What determines that the optimum/maximum transfer size is currently 128 kB? My HDD and hardware or the most current version of the OS FreeBSD 4.6.2? -- Peter Leftwich President & Founder Video2Video Services Box 13692, La Jolla, CA, 92039 USA +1-413-403-9555 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message