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> Subject: [t13] but we say the disagreeable hosts are broken > From: "Mcgrath, Jim" <[EMAIL PROTECTED]> > Date: Wednesday - January 30, 2002 8:00 PM ... > Undoubtedly a lot of people are filtering this input > through their own experience of a billion UDMA ports > in use and not ... actual problem. Funny how well things work until you turn them on. Familiar to me are specific examples of AtapiUDma devices that work only because the driver in question forces the use of Pio for anything less normal than read/write of blocks of a large power of two size agreed in advance. The driver authors in question learned to "just use Pio" back when they saw SwDma break. What was new about AtapiDma in late 2001? Streams above the 17e+6 byte/s of Pio4 became common enough that Atapi people began to care about UDma. Yea, sure, Marketing people have cared for years - but that was just a bullet. You didn't have to make UDma work always, you just had to let it move blocks of the fixed size (x200) agreed in advance outside of the standard. Life is changing now. People have already shipped 1394a/UDma and Usb2/UDma bridges that don't just plain work, not when viewed from this light. Pat LaVarre Subscribe/Unsubscribe instructions can be found at www.t13.org.
