Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751166AbWCCSzS (ORCPT ); Fri, 3 Mar 2006 13:55:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751353AbWCCSzS (ORCPT ); Fri, 3 Mar 2006 13:55:18 -0500 Received: from smtp.osdl.org ([65.172.181.4]:51415 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1750952AbWCCSzQ (ORCPT ); Fri, 3 Mar 2006 13:55:16 -0500 Date: Fri, 3 Mar 2006 10:55:03 -0800 (PST) From: Linus Torvalds To: Steve Byan cc: Mark Lord , Matthias Andree , Douglas Gilbert , Mark Rustad , linux-scsi@vger.kernel.org, Linux Kernel Mailing List Subject: Re: sg regression in 2.6.16-rc5 In-Reply-To: Message-ID: References: <4404AA2A.5010703@torque.net> <20060301083824.GA9871@merlin.emma.line.org> <4405E8AA.1090803@rtr.ca> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1516 Lines: 36 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. Linus - 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/