Messages in this thread | | | Date | Tue, 24 Jun 2003 10:28:41 -0400 | From | Jeff Garzik <> | Subject | Re: Testing IDE-TCQ and Taskfile - doesn't work nicely:) |
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Bartlomiej Zolnierkiewicz wrote: > TCQ shouldn't be enabled on hdc, you have two drives on second ide > channel and current TCQ driver design allows only one drive per channel, > so proper fix is to not enable TCQ :-).
IMO the best rule is "enable TCQ if and only if 100% of the channel supports TCQ".
So, two drives on the same channel can do TCQ, if and only if they both support TCQ. That's a big benefit of bus release, after all, simultaneously servicing multiple drives. The device-select and service interrupt semantics are annoying but doable.
Jeff
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