Re: [DO NOT APPLY] sd take advantage of rotation speed

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On Wed, 2008-06-25 at 11:53 -0600, Matthew Wilcox wrote:
> On Wed, Jun 25, 2008 at 12:43:50PM -0500, James Bottomley wrote:
> > On Wed, 2008-06-25 at 11:34 -0600, Matthew Wilcox wrote:
> > > On Wed, Jun 25, 2008 at 07:26:39PM +0200, Jens Axboe wrote:
> > > > Uhm, but it IS "a blatant layering violation", it's doing things from
> > > > the wrong side up :-)
> > > 
> > > That's just "doing things from a spot Jens doesn't approve of".  A
> > > layering violation would be SCSI knowing how elevators work.
> > 
> > When it was setting particular elevators, it was a layering violation
> > (as I said at the time).  If it's just setting a seek cost hint, that's
> > acceptable.
> 
> You're both being silly.  Interacting with a subsystem via its exposed
> interfaces is not a layering violation.

It depends on the interface: sys_open is an exposed interface, but any
SCSI driver trying to use it will be caught and shot for egregious
layering violations.

The elevator setting interface is a policy interface designed for users,
not for lower layers of the I/O stack.

> > I don't think there is any IDE work to do ... the last I heard from the
> > manufacturers, they were all not going to bother with PATA interfaces to
> > SSDs ... unless this has changed?
> 
> There are people with PATA->SATA adapters.  I think there's one in your
> P7120 (or is that one a PATA->SATA adapter?)

No ... it's using an IHC6 with two interfaces, one SATA and one PATA.

>   In any case, I don't think
> we need to do anything until someone complains.

Agreed.

James


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