Re: libata errors

[Jeff Garzik <jgarzik@pobox.com>]

Tejun Heo wrote:
> Hello,
> 
> Robert Hancock wrote:
>> I tend to doubt that the driver is doing the wrong thing.
> 
> I've tested everything including recording and cd ripping and most of
> my devices seem happy but you never know.
> 
>> I suspect it's more that ATAPI devices on SATA are about as
>> standards-compliant in general as ATAPI devices on PATA (which is to
>> say not very good) and some of them break if the controller does
>> something slightly differently or with different timing, which is
>> quite possible in AHCI mode.
>>
>> Tejun was looking at some SATA analyzer traces of a few drives that were
>> apparently failing consistently on AHCI. Tejun, did you get anywhere
>> with this?
> 
> I need to take a deeper look at that but in general I couldn't find
> anything standing out.  After a series of ATAPI changes (IIRC, the DMA
> padding change was the last thing), most ATAPI bug reports got
> resolved and I'm not getting many ATAPI failure bug reports other than
> recent ahci ones anymore.  I'm not sure whethre it indicates that we
> finally got it right or something else tho.
> 
> Jeff, what kind of failure are you seeing?

Hardware:  SATA DVD-ROM/CD-RW devices, AHCI, ICH$foo

Reading and writing data CDs and DVDs works fine.  Ripping audio CDs 
using gRip application leads to timeouts almost immediately.

	Jeff