Am Dienstag 20 November 2007 schrieb James Bottomley:
>
> On Tue, 2007-11-20 at 16:07 +0100, Oliver Neukum wrote:
> > Am Dienstag 20 November 2007 schrieb James Bottomley:
> > > I don't understand why you want to do this. Power management is a
> > > layered issue on SCSI, divided (as always) into host, device and
> > > transport. The idle you're talking about is a pure device thing, so it
> > > can be managed by the ULD (and currently is). When a unit is stopped,
> >
> > The lower layers don't know how to correctly suspend a device. sd_suspend()
> > may know how to do it. It would also mean the LLD having to detect idleness.
>
> You really mean you want to involve the transport as well, right? So
Yes, we cannot avoid that. Some device drop their caches unless they are
flushed.
> ipso facto this is more than simple idleness management. Thus, you
> really need to look into the full solution (host, transport and ULD).
Only detecting idleness without doing anything with that knowledge would
be pointless :-)
What is the right kind of sequence?
Regards
Oliver
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