From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267973AbUH2OzO (ORCPT ); Sun, 29 Aug 2004 10:55:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267974AbUH2OzO (ORCPT ); Sun, 29 Aug 2004 10:55:14 -0400 Received: from the-village.bc.nu ([81.2.110.252]:64384 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S267973AbUH2OzL (ORCPT ); Sun, 29 Aug 2004 10:55:11 -0400 Subject: Re: [PATCH] Speed up the cdrw packet writing driver From: Alan Cox To: Lee Revell Cc: Andrew Morton , Peter Osterlund , axboe@suse.de, Linux Kernel Mailing List In-Reply-To: <1093384621.817.76.camel@krustophenia.net> References: <20040823114329.GI2301@suse.de> <20040824202951.GA24280@suse.de> <20040824144707.100e0cfd.akpm@osdl.org> <1093384621.817.76.camel@krustophenia.net> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1093787569.27935.30.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Sun, 29 Aug 2004 14:52:49 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Maw, 2004-08-24 at 22:57, Lee Revell wrote: > This defaults to 8192 on my (IDE) system. IIRC this value is larger if > 48-bit addressing is in use (drive size > ~128GB). It does not seem > right to me that the size of your hard drive should dictate the amount > of I/O allowed to be in flight. The largest I/O allowed in LBA28 mode is 256 sectors, and in LBA48 rather larger. Its a limit of the command functionality. The tradeoff the other way is that LBA28 commands are slightly faster to issue.