Tejun Heo wrote:
Jeff Garzik wrote:Yeah, that has long been a design decision -- avoid all the mechanics of PIO-Multi, simply because we did not have much of a need for it (and still don't). Albert Lee worked on PIO-Multi a while ago, which was mainly to get ATA_{12,16} working, IIRC. But overall, I don't see much of a need to introduce it into the main stack?Well, there still are awful lot of PIO only devices out in the wild, so improving PIO support seems like a good idea?
.. Tons of CompactFlash cards are used PIO-only with Linux, and systems could benefit from the reduced interrupt overhead that multiple gives. Especially since those same systems tend to have rather modest embedded CPUs. We *already* do multiple-sector I/O in libata. But it currently works partially by accident, and probably gets shut off much of the time whenever the EH code is invoked and resets anything. Cheers -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
