Re: sata_nv + ADMA + Samsung disk problem

[Robert Hancock]

Tejun Heo wrote:
> Robert Hancock wrote:
> > Jeff Garzik wrote:
> > > Tejun Heo wrote:
> > > > Thanks a lot for the detailed explanation.  Nvidia ppl, any ideas?
> > > > FLUSH is used regularly.  We really need to fix this.
> > >
> > > I reiterate my opinion :)  ...   We should remove ADMA support from
> > > sata_nv.  It's only in a few chips, it's not appearing in any new
> > > chips, and nasty problems have lingered since ADMA support was
> > > introduced.
> > >
> > > Definitely sounds like we should disable ADMA by default for
> > > 2.6.24-rc, too.
> > I wouldn't agree.. It's only in a few chips (CK804/MCP04), but those
> > chips are very common in desktop, workstation, even some server
> > machines. Given the huge number of these chips out there, problem
> > reports have been quite rare.
>
> I agree with Jeff here.  Maybe not remove but disable it by default and
> when enabling warn loudly.  NCQ just doesn't enough for its cost when
> the cost includes erratic behaviors.  Only very small fraction of error
> cases actually make to bugzilla or this mailing list.
>
> Nvidia gents, is there anyway (be it NDA or whatever) to get Robert or
> any of us technical documentation?
>
> Thanks.

Last I heard, NVIDIA management gave the thumbs down to any more NDAs 
for ADMA documentation. It would be nice if they would reconsider. 
Apparently Jeff does have the docs, though..

--
Robert Hancock      Saskatoon, SK, Canada
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Home Page: http://www.roberthancock.com/

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