It seems Terry Lambert wrote:
> "Søren Schmidt" wrote:
> > > For a more "scientific test", downloading the firmware tool and
> > > setting the DMA transfer rate down, and checking for problems,
> > > would be pretty overwhelming evidence.  Personally, I don't have
> > > any of the buggers lying around to test with any more.
> > 
> > Why on earth would you do that ? (hint man atacontrol)
> > 
> > Besides I dont see this as any evidence at all, but thats another matter...
> If it fixes the problem, then the problem is most likely related
> to what firmware setting the tool changes.

AFAIK it only set the maximum DMA speed the drive will allow, that 
you can do with atacontrol as well...

> Obviously, turning off tagged commands works, according to at least
> one person who is reporting the problem.

Again that has *nothing* to do with the DTLA drives and DMA speed
and the phase of the moon...
But it shows (as we already know) that using tags on any drive
that supports it, can fail on some systems.

> I wonder if limiting outstanding tagged commands to less than the
> number advertised by the drive would also work... can't be worse
> than the initialization reordering patch that failed (e.g the
> worst case is it still has the problems).  A lot safer than banging
> bits in the firmware, I'm sure, though...
> Limiting the outstanding tagged commands to less than the advertised
> amount would actually be my first choice of a hack for a software
> workaround.

Thats not the problem either, the problem is that I apparently
changed some subtle bits that make it fail on some systems, regardless
of controller and disk type, but which is marginal enough that I
cant reproduce the problem here in the lab...


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