Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751361AbWCCTOJ (ORCPT ); Fri, 3 Mar 2006 14:14:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751503AbWCCTOJ (ORCPT ); Fri, 3 Mar 2006 14:14:09 -0500 Received: from roadrunner-base.egenera.com ([63.160.166.46]:6104 "EHLO roadrunner-base.egenera.com") by vger.kernel.org with ESMTP id S1751361AbWCCTOH (ORCPT ); Fri, 3 Mar 2006 14:14:07 -0500 In-Reply-To: References: <4404AA2A.5010703@torque.net> <20060301083824.GA9871@merlin.emma.line.org> <4405E8AA.1090803@rtr.ca> Mime-Version: 1.0 (Apple Message framework v746.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <850B5C8B-1859-4B1B-9133-79C8DA076DC1@egenera.com> Cc: Mark Lord , Matthias Andree , Douglas Gilbert , Mark Rustad , linux-scsi@vger.kernel.org, Linux Kernel Mailing List Content-Transfer-Encoding: 7bit From: Steve Byan Subject: Re: sg regression in 2.6.16-rc5 Date: Fri, 3 Mar 2006 14:13:13 -0500 To: Linus Torvalds X-Mailer: Apple Mail (2.746.2) X-OriginalArrivalTime: 03 Mar 2006 19:13:15.0200 (UTC) FILETIME=[85A99C00:01C63EF6] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1953 Lines: 64 On Mar 3, 2006, at 1:55 PM, Linus Torvalds wrote: > > > On Fri, 3 Mar 2006, Steve Byan wrote: >> >> On Mar 1, 2006, at 1:42 PM, Linus Torvalds wrote: >>> >>> I wouldn't expect it to. Most people use ATA for that, and it >>> tends to >>> have lower limits than most SCSI HBA's (well, at least the old >>> PATA), so >>> the change - if any - should at most change some of the sg.c >>> limits to be >>> no less than what SG_IO has had on ATA forever. >>> >>> Not that I expect people to have a SCSI CD/DVD drive anyway in >>> this day >>> and age, so the sg.c changes probably won't show up at all. >> >> CD-ROM support is a frequently-requested feature on the iSCSI >> Enterprise >> Target (iet) email list. It won't be long before iSCSI CD and DVD >> devices >> start showing up, although the underlying hardware will be ATAPI >> or else >> missing entirely (i.e. ISO image file). > > Yes, but the point that the ATA limits tend to be on the low side > still > stands. > > For example, I think the IDE driver defaults to a maximum transfer > of 256 > sectors, and the same number of max scatter-gather entries. Some > controllers will actually lower that, due to silly hw problems. > > The point being that it has worked fine for IDE, and if a SCSI > controller > has noticeably lower limits than that, there's something really > strange > going on, like a real bug. Yes, you are correct. I wasn't intending to contest your main point. I only intended to point out that ignoring bugs because no-one uses SCSI DVDs will soon lead to much grief. Regards, -Steve -- Steve Byan Software Architect Egenera, Inc. 165 Forest Street Marlboro, MA 01752 (508) 858-3125 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/