Arjan van de Ven wrote:
Jeff Garzik wrote:
SATA standard defines lower power phy states. So the same argument
you're using for AHCI applies there too -- "just" enabling an existing
hardware feature.
yes I'm not arguing against that. I was trying to find out (and
suggest-unless-proven-otherwise) that the 2 are not exclusive or
conflicting... in fact I assume both are wanted concurrently.
Yes and no. As I understand it, AHCI's capability is an automatic
version of what standard SATA phys provide manually. In AHCI's case,
the hardware automatically manages the link power, possibly cycling it
hundreds of times per second. In the standard case, software must
determine when a different power state is appropriate based on current
conditions, and update the phy appropriately.
Jeff
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