O> - MDMA is not really supported, hence why it is so slow - if I can > disable mdma and tell it to use single word PIO4, then I might get a > reasonable 15Mb/s - however extensive searching has shown me that > libata doesn't allow a user to set the xfer mode? libata automatically picks the best mode for the device. Right now it doesn't allow hand hacking this. I've got some patches (which I think I sent in for the latest -mm) which allow you to specify that pata dma doesn't occur for certain classes of device. > - UDMA is not detected for some reason, even if it is supported by the > card and by the controller (is there any way to force that to be > enabled, regardless of whether it is detected or not?) > - Even more worryingly for me, is that Windows also resorts to using > Multiword DMA 2, and it is frightfully slow (which is a big > disappointment - seeing as another X41 user (who is undoubtedly using > windows!) has reported success!) - I am currently trying to get in > touch with this user > - I bought a card which is too fast for its own good - if only it > could only support PIO, then I might not be in this mess! =) If MWDMA2 is also very slow that is suprising. Is Windows in fact dropping back to PIO as well ? A lot of CF cards support MWDMA, very few UDMA. To complicate things many CF convertors do not support MWDMA, quite a few are electrically inadequate for UDMA (I guess being defined long before anyone thought about UDMA and CF). Finally to completely screw you most SATA/PATA convertors don't support anything but a few UDMA modes and PIO. Alan - 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
