RE: Why is NCQ enabled by default by libata? (2.6.20)

David Schwartz
2007-03-29T21:47:40Z

> But when writing, what is the difference between queuing multiple tagged
> writes, and sending down multiple untagged cached writes that complete
> immediately and actually hit the disk later? Either way the host keeps
> sending writes to the disk until it's buffers are full, and the disk is
> constantly trying to commit those buffers to the media in the most
> optimal order.

Which sounds faster to you:

1) "Do A, B, C, and D."
"Okay, I've finished A, B, C, and B."
or

2) "Do A."
"Okay."
"Do B."
"Okay."
"Do C."
"Okay."
"Do D."
"Okay."

The first looks a bit more efficient to me.

DS