Re: Silicon Image 3112A SATA trouble

Jens Axboe
2003-11-30T18:17:51Z

On Sun, Nov 30 2003, Vojtech Pavlik wrote:
> On Sun, Nov 30, 2003 at 06:10:06PM +0100, Jens Axboe wrote:
>
> > On Sun, Nov 30 2003, Jeff Garzik wrote:
> > > Bartlomiej Zolnierkiewicz wrote:
> > > >On Sunday 30 of November 2003 17:51, Jens Axboe wrote:
> > > >>>Tangent: My non-pessimistic fix will involve submitting a single sector
> > > >>>DMA r/w taskfile manually, then proceeding with the remaining sectors in
> > > >>>another r/w taskfile. This doubles the interrupts on the affected
> > > >>>chipset/drive combos, but still allows large requests. I'm not terribly
> > > >>
> > > >>Or split the request 50/50.
> > > >
> > > >
> > > >We can't - hardware will lock up.
> > >
> > > Well, the constraint we must satisfy is
> > >
> > > sector_count % 15 != 1
> >
> > (sector_count % 15 != 1) && (sector_count != 1)
> >
> > to be more precise :)
>
> I think you wanted to say:
>
> (sector_count % 15 != 1) || (sector_count == 1)

Ehm no, I don't think so... To my knowledge, sector_count == 1 is ok. If
not, the hardware would be seriously screwed (ok it is already) beyond
software fixups.

--
Jens Axboe