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SubjectRe: sg regression in 2.6.16-rc5
Date

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 <smb@egenera.com>
Software Architect
Egenera, Inc.
165 Forest Street
Marlboro, MA 01752
(508) 858-3125


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